FITS images used in this processing run:

Field Lyn-01-Q2b1x1 reference image: Lyn-01-Q2b1x1_2026-01-08_23-14-53_20.00sec_-15.00C_LIGHT_0201.fits
Field Lyn-01-Q2b1x1 reference image: Lyn-01-Q2b1x1_2026-02-11_00-13-56_20.00sec_-15.00C_LIGHT_0239.fits
Field Lyn-01-Q2b1x1 second-epoch image: Lyn-01-Q2b1x1_2026-08-06_04-51-27_20.00sec_-0.00C_LIGHT_0435.fits
Field Lyn-01-Q2b1x1 second-epoch image: Lyn-01-Q2b1x1_2026-08-06_04-52-05_20.00sec_-0.00C_LIGHT_0436.fits

WARNING: VaST exited with code 1 on the field Lyn-01-Q2b1x1 after completing the measurements (memory cleanup crash); the transient search continues.
## VaST run with SExtractor config file default.sex.telephoto_lens_onlybrightstars_v1 ##
Images processed 4
Images used for photometry 2
Ref.  image: 2461049.71879162 09.01.2026 05:14:53.596   /data_ssd/NMW-TexasTech/reference_imgs/Lyn-01-Q2b1x1_2026-01-08_23-14-53_20.00sec_-15.00C_LIGHT_0201.fits
First image: 2461049.71879162 09.01.2026 05:14:53.596   /data_ssd/NMW-TexasTech/reference_imgs/Lyn-01-Q2b1x1_2026-01-08_23-14-53_20.00sec_-15.00C_LIGHT_0201.fits
Last  image: 2461082.75979275 11.02.2026 06:13:56.094   /data_ssd/NMW-TexasTech/reference_imgs/Lyn-01-Q2b1x1_2026-02-11_00-13-56_20.00sec_-15.00C_LIGHT_0239.fits
JD time system (TT/UTC/UNKNOWN): UTC
FILTER key from ref. img. header: CV
Magnitude scale: instrumental
Estimated ref. image limiting mag.:  -7.44
Magnitude-Size filter: Disabled
For each source choose aperture with the smallest scatter: YES
Photometric errors rescaling: NO
Number of identified bad images: 0
Number of SysRem iterations: 0
User-specified moving object: none
Computation time: 5 seconds
Number of parallel threads: 3
SExtractor parameter file: default.sex
Some important SExtractor parameters:
DETECT_MINAREA  10.0             # minimum number of pixels above threshold
DETECT_THRESH   10.0             #  or , in mag.arcsec-2
ANALYSIS_THRESH 10.0             #  or , in mag.arcsec-2
SATUR_LEVEL     55000.0         # level (in ADUs) at which arises saturation
GAIN            0.37            # detector gain in e-/ADU
VAST_SKIP_INDEX_VS_MAG is set - skipping the lib/index_vs_mag variability-index fitting
Total objects detected (at least 2 times):  7210
Objects passed selection criteria:  7151
Measurements per detected object (mean, median, min, max):    2.0    2.0    2    2
Measurements per selected object (mean, median, min, max):    2.0    2.0    2    2
Average stars detected per image: 11735.5
Average stars matched: 10538 (89.7959 %)
Memory usage VmPeak:   238096 kB
Software: VaST 1.0rc90 compiled with gcc (Gentoo 15.2.1_p20260214 p5) 15.2.1 20260214
VaST compiled on  Wed Aug  5 15:05:04 CDT 2026
VaST build number  1.0rc89-189-g49d3cdfd
OpenMP enabled: Yes
SExtractor version 2.19.5 (2026-08-05)
GNU bash, version 5.3.9(1)-release (x86_64-pc-linux-gnu)
Processing completed on  Thu Aug  6 04:58:20 CDT 2026
Host name: tau
***** IMAGE PROCESSING ERROR (less than 4 images processed) *****
############################################################
WARNING: VaST exited with code 1 on the field Lyn-01-Q2b1x1 after completing the measurements (memory cleanup crash); the transient search continues.
## VaST run with SExtractor config file default.sex.telephoto_lens_vSTL ##
Images processed 4
Images used for photometry 2
Ref.  image: 2461049.71879162 09.01.2026 05:14:53.596   /data_ssd/NMW-TexasTech/reference_imgs/Lyn-01-Q2b1x1_2026-01-08_23-14-53_20.00sec_-15.00C_LIGHT_0201.fits
First image: 2461049.71879162 09.01.2026 05:14:53.596   /data_ssd/NMW-TexasTech/reference_imgs/Lyn-01-Q2b1x1_2026-01-08_23-14-53_20.00sec_-15.00C_LIGHT_0201.fits
Last  image: 2461082.75979275 11.02.2026 06:13:56.094   /data_ssd/NMW-TexasTech/reference_imgs/Lyn-01-Q2b1x1_2026-02-11_00-13-56_20.00sec_-15.00C_LIGHT_0239.fits
JD time system (TT/UTC/UNKNOWN): UTC
FILTER key from ref. img. header: CV
Magnitude scale: instrumental
Estimated ref. image limiting mag.:  -7.13
Magnitude-Size filter: Disabled
For each source choose aperture with the smallest scatter: YES
Photometric errors rescaling: NO
Number of identified bad images: 0
Number of SysRem iterations: 0
User-specified moving object: none
Computation time: 12 seconds
Number of parallel threads: 3
SExtractor parameter file: default.sex
Some important SExtractor parameters:
DETECT_MINAREA  2.0             # minimum number of pixels above threshold
DETECT_THRESH   3.0             #  or , in mag.arcsec-2
ANALYSIS_THRESH 3.0             #  or , in mag.arcsec-2
SATUR_LEVEL     57000.0         # level (in ADUs) at which arises saturation
GAIN            0.83            # detector gain in e-/ADU
WEIGHT_TYPE BACKGROUND
VAST_SKIP_INDEX_VS_MAG is set - skipping the lib/index_vs_mag variability-index fitting
Total objects detected (at least 2 times):  53131
Objects passed selection criteria:  52878
Measurements per detected object (mean, median, min, max):    2.0    2.0    2    2
Measurements per selected object (mean, median, min, max):    2.0    2.0    2    2
Average stars detected per image: 82750
Average stars matched: 73723 (89.0912 %)
Memory usage VmPeak:   301732 kB
Software: VaST 1.0rc90 compiled with gcc (Gentoo 15.2.1_p20260214 p5) 15.2.1 20260214
VaST compiled on  Wed Aug  5 15:05:04 CDT 2026
VaST build number  1.0rc89-189-g49d3cdfd
OpenMP enabled: Yes
SExtractor version 2.19.5 (2026-08-05)
GNU bash, version 5.3.9(1)-release (x86_64-pc-linux-gnu)
Processing completed on  Thu Aug  6 04:58:34 CDT 2026
Host name: tau
***** IMAGE PROCESSING ERROR (less than 4 images processed) *****
############################################################

######## Processing parameters ########
AAVSO_COMMENT_STRING= NMW-TexasTech Camera-2 135mm f/2.2 telephoto lens + QHY600M CMOS
ASTCHECK_ASTEROID_SEARCH_RADIUS_ARCSEC= 
BAD_REGION_FILE= /var/www/nmw_calibration/TTUQ2b1x1/TTUQ2_bad_region.lst
CAMERA_SETTINGS= TTUQ2b1x1
CHECK_POINTING_ACCURACY= yes
DARK_FRAMES_DIR_OR_FILE= /var/www/nmw_calibration/TTUQ2b1x1/darks
EXCLUSION_LIST= ../exclusion_list_TTUQ2.txt
FILTER_BAD_IMG__MAX_APERTURE_STAR_SIZE_PIX= 12.5
FILTER_BAD_IMG__MAX_ELONGATION_AminusB_PIX= 0.55
FILTER_BAD_IMG__MIN_APERTURE_STAR_SIZE_PIX= 2.0
FILTER_BRIGHT_MAG_CUTOFF_TRANSIENT_SEARCH= -5
FILTER_FAINT_MAG_CUTOFF_TRANSIENT_SEARCH= 15.5
FLAT_FIELD_DIR_OR_FILE= /var/www/nmw_calibration/TTUQ2b1x1/flats
FRAME_EDGE_OFFSET_PIX= 600
GAIA_BAND_FOR_CATALOGED_SOURCE_CHECK= 
MAX_NEW_TO_REF_MEAN_IMG_VALUE_RATIO= 100
DISABLE_NEW_TO_REF_MEAN_IMG_RATIO_CHECK= yes
MAX_NEW_IMG_MEAN_VALUE= 25000
MAX_SD_RATIO_OF_SECOND_EPOCH_IMGS= 0.18
MAX_SD_RATIO_OF_SECOND_EPOCH_IMGS_SOFT_LIMIT= 0.12
MPC_CODE= V36
NMW_CALIBRATION= /var/www/nmw_calibration
NUMBER_OF_DETECTED_TRANSIENTS_BEFORE_FILTERING_HARD_LIMIT= 10000
NUMBER_OF_DETECTED_TRANSIENTS_BEFORE_FILTERING_SOFT_LIMIT= 8000
OMP_NUM_THREADS= 3
ONLINE_MPCHECKER_BUTTON_ASTEROID_SEARCH_RADIUS_ARCMIN= 
PHOTOMETRIC_CALIBRATION= 
REQUIRE_PIX_SHIFT_BETWEEN_IMAGES_FOR_TRANSIENT_CANDIDATES= yes
SEXTRACTOR_CONFIG_BRIGHTSTARPASS= default.sex.telephoto_lens_onlybrightstars_v1
SEXTRACTOR_CONFIG_FILES= default.sex.telephoto_lens_onlybrightstars_v1 default.sex.telephoto_lens_vSTL
STARMATCH_RADIUS_PIX= 5
SYSREM_ITERATIONS= 0
TELESCOP= 
TELESCOP_NAME_KNOWN_TO_VaST_FOR_FOV_DETERMINATION= 
UCAC5_PLATESOLVE_ITERATIONS= 2
FPACK_FULLY_CALIBRATED_IMAGE= no
#######################################
HOSTNAME= tau
USER= 
HOME= 
#######################################
SExtractor catalog cache: enabled, directory /data_ssd/NMW-TexasTech/vast_sextractor_cache
Reference image directory is set to /data_ssd/NMW-TexasTech/reference_imgs
VIZIER_SITE=vizier.cds.unistra.fr
GAIA_DR2_CLIENT=vizquery (lib/vizquery -> VizieR vizier.cds.unistra.fr)
INFO: MAKE_PNG_PLOTS is set to yes
FITS_FILE_EXT=fits
CALIBRATION_STATUS_PREFIX=
Fields in the data directory: 
Lyn-01-Q2b1x1
#######################################
########### Starting Lyn-01-Q2b1x1 ###########
Processing Lyn-01-Q2b1x1
server tau has sufficient free disk space available: 372630 MB at /data_ssd/NMW-TexasTech/workdir
server tau has sufficient free disk space available: 372630 MB at .
Checking input images (2 new)
REFERENCE_EPOCH__FIRST_IMAGE= /data_ssd/NMW-TexasTech/reference_imgs/Lyn-01-Q2b1x1_2026-01-08_23-14-53_20.00sec_-15.00C_LIGHT_0201.fits
REFERENCE_EPOCH__SECOND_IMAGE= /data_ssd/NMW-TexasTech/reference_imgs/Lyn-01-Q2b1x1_2026-02-11_00-13-56_20.00sec_-15.00C_LIGHT_0239.fits
Small preview (one of the new images): 

Large previews of the second-epoch (new) images:

MAKE_PNG_PLOTS=yes


renamed 'Lyn-01-Q2b1x1_2026-08-06_04-51-27_20.00sec_-0.00C_LIGHT_0435.png' -> 'transient_report/Lyn-01-Q2b1x1_2026-08-06_04-51-27_20.00sec_-0.00C_LIGHT_0435.fits_preview.png'

Lyn-01-Q2b1x1_2026-08-06_04-51-27_20.00sec_-0.00C_LIGHT_0435.fits


renamed 'Lyn-01-Q2b1x1_2026-08-06_04-52-05_20.00sec_-0.00C_LIGHT_0436.png' -> 'transient_report/Lyn-01-Q2b1x1_2026-08-06_04-52-05_20.00sec_-0.00C_LIGHT_0436.fits_preview.png'

Lyn-01-Q2b1x1_2026-08-06_04-52-05_20.00sec_-0.00C_LIGHT_0436.fits




Read-check the input FITS images... read-check OK
Blank image check the input FITS images... blank-image-check OK
Read date check the input FITS images... read-date-check OK
Mean value check the input FITS images... OK, at least two new images have mean values below the threshold.
----------------------------------------------
INFO: REFERENCE_EPOCH__FIRST_IMAGE_MEAN_VALUE= 477.4988
INFO:         REFERENCE_EPOCH__FIRST_IMAGE_SD= 657.6447
INFO:    SECOND_EPOCH__FIRST_IMAGE_MEAN_VALUE= 3664.5769
INFO:            SECOND_EPOCH__FIRST_IMAGE_SD= 918.6961
INFO:   SECOND_EPOCH__SECOND_IMAGE_MEAN_VALUE= 3724.7174
INFO:           SECOND_EPOCH__SECOND_IMAGE_SD= 906.0931
----------------------------------------------
INFO:      ref_to_second_epoch_img_mean_ratio= 7.67453
INFO:                  SECOND_EPOCH__SD_ratio= 0.014
INFO: the new-to-reference mean image value ratio check is disabled (DISABLE_NEW_TO_REF_MEAN_IMG_RATIO_CHECK=yes) - expected with a background-subtracted reference image
----------------------------------------------
Calibration settings: DARK_FRAMES_DIR_OR_FILE=/var/www/nmw_calibration/TTUQ2b1x1/darks FLAT_FIELD_DIR_OR_FILE=/var/www/nmw_calibration/TTUQ2b1x1/flats
EXPTIME =                 20.0 / [s] Exposure duration
SET-TEMP=                  0.0 / [degC] CCD temperature setpoint
CCD-TEMP=                 -0.0 / [degC] CCD temperature
FOCTEMP =     23.4899997711182 / [degC] Focuser temperature
Exploring image header: /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/Lyn-01-Q2b1x1_2026-08-06_04-51-27_20.00sec_-0.00C_LIGHT_0435.fits 
CCD-TEMP= -0.000000 for /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/Lyn-01-Q2b1x1_2026-08-06_04-51-27_20.00sec_-0.00C_LIGHT_0435.fits
SET-TEMP= 0.000000 for /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/Lyn-01-Q2b1x1_2026-08-06_04-51-27_20.00sec_-0.00C_LIGHT_0435.fits
Header: 67 keys total, 4 keys left
Record 0: "" status=0
Record 1: "SIMPLE  =                    T / C# FITS" status=0
Record 2: "BITPIX  =                   16" status=0
Record 3: "NAXIS   =                    2 / Dimensionality" status=0
Record 4: "NAXIS1  =                 9576" status=0
Record 5: "NAXIS2  =                 6388" status=0
Record 6: "BZERO   =                32768" status=0
Record 7: "EXTEND  =                    T / Extensions are permitted" status=0
Record 8: "IMAGETYP= 'LIGHT'              / Type of exposure" status=0
Record 9: "EXPOSURE=                 20.0 / [s] Exposure duration" status=0
Record 10: "EXPTIME =                 20.0 / [s] Exposure duration" status=0
Record 11: "DATE-LOC= '2026-08-06T04:51:27.8703160' / Time of observation (local)" status=0
Record 12: "DATE-OBS= '2026-08-06T09:51:27.8703160' / Time of observation (UTC)" status=0
Record 13: "MJD-OBS =      61258.410739236 / Modified Julian Date of observation" status=0
Record 14: "DATE-AVG= '2026-08-06T09:51:37.7748667' / Averaged midpoint time (UTC)" status=0
Record 15: "MJD-AVG =     61258.4108538656 / Modified Julian Date of averaged midpoint" status=0
Record 16: "XBINNING=                    1 / X axis binning factor" status=0
Record 17: "YBINNING=                    1 / Y axis binning factor" status=0
Record 18: "GAIN    =                   30 / Sensor gain" status=0
Record 19: "OFFSET  =                   30 / Sensor gain offset" status=0
Record 20: "XPIXSZ  =                 3.76 / [um] Pixel X axis size" status=0
Record 21: "YPIXSZ  =                 3.76 / [um] Pixel Y axis size" status=0
Record 22: "INSTRUME= 'QHY600M'            / Imaging instrument name" status=0
Record 23: "CAMERAID= 'QHY600M-84137c4dbbbd119a9' / Imaging instrument identifier" status=0
Record 24: "SET-TEMP=                  0.0 / [degC] CCD temperature setpoint" status=0
Record 25: "CCD-TEMP=                 -0.0 / [degC] CCD temperature" status=0
Record 26: "READOUTM= '2CMS-0'             / Sensor readout mode" status=0
Record 27: "USBLIMIT=                   50 / Camera-specific USB setting" status=0
Record 28: "TELESCOP= 'QHY600M-TTU2'       / Name of telescope" status=0
Record 29: "FOCALLEN=                135.0 / [mm] Focal length" status=0
Record 30: "FOCRATIO=                  2.2 / Focal ratio" status=0
Record 31: "RA      =     105.879917102089 / [deg] RA of telescope" status=0
Record 32: "DEC     =     54.0000330082085 / [deg] Declination of telescope" status=0
Record 33: "CENTALT =     18.5886111111111 / [deg] Altitude of telescope" status=0
Record 34: "CENTAZ  =     36.7458333333333 / [deg] Azimuth of telescope" status=0
Record 35: "AIRMASS =     3.10976726568583 / Airmass at frame center (Gueymard 1993)" status=0
Record 36: "PIERSIDE= 'West'               / Telescope pointing state" status=0
Record 37: "SITEELEV=               1009.5 / [m] Observation site elevation" status=0
Record 38: "SITELAT =           33.7482925 / [deg] Observation site latitude" status=0
Record 39: "SITELONG=          -101.958319 / [deg] Observation site longitude" status=0
Record 40: "OBSERVER= 'Sokolovsky'         / Observer name" status=0
Record 41: "OBSERVAT= 'TTU Skyview'        / Observatory name" status=0
Record 42: "SITENAME= ''                   / Observatory site name" status=0
Record 43: "FWHEEL  = 'Simulator'          / Filter Wheel name" status=0
Record 44: "FILTER  = 'CV'                 / Active filter name" status=0
Record 45: "OBJECT  = 'Lyn-01'             / Name of the object of interest" status=0
Record 46: "OBJCTRA = '07 03 32'           / [H M S] RA of imaged object" status=0
Record 47: "OBJCTDEC= '+54 00 00'          / [D M S] Declination of imaged object" status=0
Record 48: "OBJCTROT=                  0.0 / [deg] planned rotation of imaged object" status=0
Record 49: "FOCNAME = 'ZWO Focuser'        / Focusing equipment name" status=0
Record 50: "FOCPOS  =                20440 / [step] Focuser position" status=0
Record 51: "FOCUSPOS=                20440 / [step] Focuser position" status=0
Record 52: "FOCUSSZ =                  0.0 / [um] Focuser step size" status=0
Record 53: "FOCTEMP =     23.4899997711182 / [degC] Focuser temperature" status=0
Record 54: "FOCUSTEM=     23.4899997711182 / [degC] Focuser temperature" status=0
Record 55: "ROWORDER= 'TOP-DOWN'           / FITS Image Orientation" status=0
Record 56: "EQUINOX =               2000.0 / Equinox of celestial coordinate system" status=0
Record 57: "SWCREATE= 'N.I.N.A. 3.2.0.9001 (x64)' / Software that created this file" status=0
Record 58: "QHY_EXP =            20.000096 / [s] Actual exposure time" status=0
Record 59: "QHY_PP  =              13888.0 / [ps] pixelPeriod" status=0
Record 60: "QHY_LP  =              85000.0 / [ns] linePeriod" status=0
Record 61: "GPS_LP  =              85000.0 / [ns] linePeriod" status=0
Record 62: "QHY_FP  =           20000160.0 / [us] framePeriod" status=0
Record 63: "QHY_CPL =               6120.0 / clocksPerLine" status=0
Record 64: "QHY_LPF =             235295.0 / linesPerFrame" status=0
Record 65: "QHY_AET =           20000096.0 / [us] actualExposureTime" status=0
Record 66: "QHY_LEM =                    T / isLongExposureMode" status=0
Record 67: "QHY_OFF0=             3767.777 / [us] RollingShutterEndOffset row 0" status=0
Allocating memory for image, dark and result arrays...
Reading image /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/Lyn-01-Q2b1x1_2026-08-06_04-51-27_20.00sec_-0.00C_LIGHT_0435.fits 9576 6388  16 bitpix
SET-TEMP= 0.000000 for /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/Lyn-01-Q2b1x1_2026-08-06_04-51-27_20.00sec_-0.00C_LIGHT_0435.fits
SET-TEMP= 0.000000 for /var/www/nmw_calibration/TTUQ2b1x1/darks/mdark_TTUQ2b1x1_0C_20s_2026-07-30.fit
CCD-TEMP= -0.000000 for /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/Lyn-01-Q2b1x1_2026-08-06_04-51-27_20.00sec_-0.00C_LIGHT_0435.fits
CCD-TEMP= -0.000000 for /var/www/nmw_calibration/TTUQ2b1x1/darks/mdark_TTUQ2b1x1_0C_20s_2026-07-30.fit
Reading dark frame /var/www/nmw_calibration/TTUQ2b1x1/darks/mdark_TTUQ2b1x1_0C_20s_2026-07-30.fit 9576 6388  16 bitpix
Dark frame is subtracted, output is written to /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/d_Lyn-01-Q2b1x1_2026-08-06_04-51-27_20.00sec_-0.00C_LIGHT_0435.fits :)

Spent 0.790620 seconds 
renamed 'mdark_TTUQ2b1x1_0C_20s_2026-07-30.png' -> 'transient_report/dark.png'
try_to_calibrate_the_input_frame(): selected flat field /var/www/nmw_calibration/TTUQ2b1x1/flats/mff_TTUQ2b1x1_2026-07-30.fit from directory /var/www/nmw_calibration/TTUQ2b1x1/flats
MegaDivider v7
Reading image /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/d_Lyn-01-Q2b1x1_2026-08-06_04-51-27_20.00sec_-0.00C_LIGHT_0435.fits 9576 6388  16 bitpix
Reading flat /var/www/nmw_calibration/TTUQ2b1x1/flats/mff_TTUQ2b1x1_2026-07-30.fit 9576 6388  16 bitpix
Avarage count on flat field image: 19899.553568
Minimal real count (from overscan): 5
Output is written to /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/fd_Lyn-01-Q2b1x1_2026-08-06_04-51-27_20.00sec_-0.00C_LIGHT_0435.fits :)


No overscan detected - all values seem high! (left_median=13115.0, right_median=15628.5)
renamed 'mff_TTUQ2b1x1_2026-07-30.png' -> 'transient_report/flat.png'
Using calibrated image CALIBRATED_SECOND_EPOCH__FIRST_IMAGE=/data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/fd_Lyn-01-Q2b1x1_2026-08-06_04-51-27_20.00sec_-0.00C_LIGHT_0435.fits
EXPTIME =                 20.0 / [s] Exposure duration
SET-TEMP=                  0.0 / [degC] CCD temperature setpoint
CCD-TEMP=                 -0.0 / [degC] CCD temperature
FOCTEMP =     23.5799999237061 / [degC] Focuser temperature
Exploring image header: /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/Lyn-01-Q2b1x1_2026-08-06_04-52-05_20.00sec_-0.00C_LIGHT_0436.fits 
CCD-TEMP= -0.000000 for /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/Lyn-01-Q2b1x1_2026-08-06_04-52-05_20.00sec_-0.00C_LIGHT_0436.fits
SET-TEMP= 0.000000 for /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/Lyn-01-Q2b1x1_2026-08-06_04-52-05_20.00sec_-0.00C_LIGHT_0436.fits
Header: 67 keys total, 4 keys left
Record 0: "" status=0
Record 1: "SIMPLE  =                    T / C# FITS" status=0
Record 2: "BITPIX  =                   16" status=0
Record 3: "NAXIS   =                    2 / Dimensionality" status=0
Record 4: "NAXIS1  =                 9576" status=0
Record 5: "NAXIS2  =                 6388" status=0
Record 6: "BZERO   =                32768" status=0
Record 7: "EXTEND  =                    T / Extensions are permitted" status=0
Record 8: "IMAGETYP= 'LIGHT'              / Type of exposure" status=0
Record 9: "EXPOSURE=                 20.0 / [s] Exposure duration" status=0
Record 10: "EXPTIME =                 20.0 / [s] Exposure duration" status=0
Record 11: "DATE-LOC= '2026-08-06T04:52:05.1792267' / Time of observation (local)" status=0
Record 12: "DATE-OBS= '2026-08-06T09:52:05.1792267' / Time of observation (UTC)" status=0
Record 13: "MJD-OBS =     61258.4111710531 / Modified Julian Date of observation" status=0
Record 14: "DATE-AVG= '2026-08-06T09:52:15.0826671' / Averaged midpoint time (UTC)" status=0
Record 15: "MJD-AVG =     61258.4112856714 / Modified Julian Date of averaged midpoint" status=0
Record 16: "XBINNING=                    1 / X axis binning factor" status=0
Record 17: "YBINNING=                    1 / Y axis binning factor" status=0
Record 18: "GAIN    =                   30 / Sensor gain" status=0
Record 19: "OFFSET  =                   30 / Sensor gain offset" status=0
Record 20: "XPIXSZ  =                 3.76 / [um] Pixel X axis size" status=0
Record 21: "YPIXSZ  =                 3.76 / [um] Pixel Y axis size" status=0
Record 22: "INSTRUME= 'QHY600M'            / Imaging instrument name" status=0
Record 23: "CAMERAID= 'QHY600M-84137c4dbbbd119a9' / Imaging instrument identifier" status=0
Record 24: "SET-TEMP=                  0.0 / [degC] CCD temperature setpoint" status=0
Record 25: "CCD-TEMP=                 -0.0 / [degC] CCD temperature" status=0
Record 26: "READOUTM= '2CMS-0'             / Sensor readout mode" status=0
Record 27: "USBLIMIT=                   50 / Camera-specific USB setting" status=0
Record 28: "TELESCOP= 'QHY600M-TTU2'       / Name of telescope" status=0
Record 29: "FOCALLEN=                135.0 / [mm] Focal length" status=0
Record 30: "FOCRATIO=                  2.2 / Focal ratio" status=0
Record 31: "RA      =     105.879917041023 / [deg] RA of telescope" status=0
Record 32: "DEC     =      54.000033035385 / [deg] Declination of telescope" status=0
Record 33: "CENTALT =     18.6633333333333 / [deg] Altitude of telescope" status=0
Record 34: "CENTAZ  =     36.7955555555556 / [deg] Azimuth of telescope" status=0
Record 35: "AIRMASS =     3.09799537508066 / Airmass at frame center (Gueymard 1993)" status=0
Record 36: "PIERSIDE= 'West'               / Telescope pointing state" status=0
Record 37: "SITEELEV=               1009.5 / [m] Observation site elevation" status=0
Record 38: "SITELAT =           33.7482925 / [deg] Observation site latitude" status=0
Record 39: "SITELONG=          -101.958319 / [deg] Observation site longitude" status=0
Record 40: "OBSERVER= 'Sokolovsky'         / Observer name" status=0
Record 41: "OBSERVAT= 'TTU Skyview'        / Observatory name" status=0
Record 42: "SITENAME= ''                   / Observatory site name" status=0
Record 43: "FWHEEL  = 'Simulator'          / Filter Wheel name" status=0
Record 44: "FILTER  = 'CV'                 / Active filter name" status=0
Record 45: "OBJECT  = 'Lyn-01'             / Name of the object of interest" status=0
Record 46: "OBJCTRA = '07 03 32'           / [H M S] RA of imaged object" status=0
Record 47: "OBJCTDEC= '+54 00 00'          / [D M S] Declination of imaged object" status=0
Record 48: "OBJCTROT=                  0.0 / [deg] planned rotation of imaged object" status=0
Record 49: "FOCNAME = 'ZWO Focuser'        / Focusing equipment name" status=0
Record 50: "FOCPOS  =                20440 / [step] Focuser position" status=0
Record 51: "FOCUSPOS=                20440 / [step] Focuser position" status=0
Record 52: "FOCUSSZ =                  0.0 / [um] Focuser step size" status=0
Record 53: "FOCTEMP =     23.5799999237061 / [degC] Focuser temperature" status=0
Record 54: "FOCUSTEM=     23.5799999237061 / [degC] Focuser temperature" status=0
Record 55: "ROWORDER= 'TOP-DOWN'           / FITS Image Orientation" status=0
Record 56: "EQUINOX =               2000.0 / Equinox of celestial coordinate system" status=0
Record 57: "SWCREATE= 'N.I.N.A. 3.2.0.9001 (x64)' / Software that created this file" status=0
Record 58: "QHY_EXP =            20.000096 / [s] Actual exposure time" status=0
Record 59: "QHY_PP  =              13888.0 / [ps] pixelPeriod" status=0
Record 60: "QHY_LP  =              85000.0 / [ns] linePeriod" status=0
Record 61: "GPS_LP  =              85000.0 / [ns] linePeriod" status=0
Record 62: "QHY_FP  =           20000160.0 / [us] framePeriod" status=0
Record 63: "QHY_CPL =               6120.0 / clocksPerLine" status=0
Record 64: "QHY_LPF =             235295.0 / linesPerFrame" status=0
Record 65: "QHY_AET =           20000096.0 / [us] actualExposureTime" status=0
Record 66: "QHY_LEM =                    T / isLongExposureMode" status=0
Record 67: "QHY_OFF0=             3767.777 / [us] RollingShutterEndOffset row 0" status=0
Allocating memory for image, dark and result arrays...
Reading image /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/Lyn-01-Q2b1x1_2026-08-06_04-52-05_20.00sec_-0.00C_LIGHT_0436.fits 9576 6388  16 bitpix
SET-TEMP= 0.000000 for /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/Lyn-01-Q2b1x1_2026-08-06_04-52-05_20.00sec_-0.00C_LIGHT_0436.fits
SET-TEMP= 0.000000 for /var/www/nmw_calibration/TTUQ2b1x1/darks/mdark_TTUQ2b1x1_0C_20s_2026-07-30.fit
CCD-TEMP= -0.000000 for /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/Lyn-01-Q2b1x1_2026-08-06_04-52-05_20.00sec_-0.00C_LIGHT_0436.fits
CCD-TEMP= -0.000000 for /var/www/nmw_calibration/TTUQ2b1x1/darks/mdark_TTUQ2b1x1_0C_20s_2026-07-30.fit
Reading dark frame /var/www/nmw_calibration/TTUQ2b1x1/darks/mdark_TTUQ2b1x1_0C_20s_2026-07-30.fit 9576 6388  16 bitpix
Dark frame is subtracted, output is written to /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/d_Lyn-01-Q2b1x1_2026-08-06_04-52-05_20.00sec_-0.00C_LIGHT_0436.fits :)

Spent 0.598530 seconds 
renamed 'mdark_TTUQ2b1x1_0C_20s_2026-07-30.png' -> 'transient_report/dark.png'
try_to_calibrate_the_input_frame(): selected flat field /var/www/nmw_calibration/TTUQ2b1x1/flats/mff_TTUQ2b1x1_2026-07-30.fit from directory /var/www/nmw_calibration/TTUQ2b1x1/flats
MegaDivider v7
Reading image /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/d_Lyn-01-Q2b1x1_2026-08-06_04-52-05_20.00sec_-0.00C_LIGHT_0436.fits 9576 6388  16 bitpix
Reading flat /var/www/nmw_calibration/TTUQ2b1x1/flats/mff_TTUQ2b1x1_2026-07-30.fit 9576 6388  16 bitpix
Avarage count on flat field image: 19899.553568
Minimal real count (from overscan): 5
Output is written to /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/fd_Lyn-01-Q2b1x1_2026-08-06_04-52-05_20.00sec_-0.00C_LIGHT_0436.fits :)


No overscan detected - all values seem high! (left_median=13115.0, right_median=15628.5)
renamed 'mff_TTUQ2b1x1_2026-07-30.png' -> 'transient_report/flat.png'
Using calibrated image CALIBRATED_SECOND_EPOCH__SECOND_IMAGE=/data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/fd_Lyn-01-Q2b1x1_2026-08-06_04-52-05_20.00sec_-0.00C_LIGHT_0436.fits
Dark frame used to calibrate the second-epoch images:



Flat field used to calibrate the second-epoch images:



after the calibration attempt:
SECOND_EPOCH__FIRST_IMAGE=/data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/fd_Lyn-01-Q2b1x1_2026-08-06_04-51-27_20.00sec_-0.00C_LIGHT_0435.fits
SECOND_EPOCH__SECOND_IMAGE=/data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/fd_Lyn-01-Q2b1x1_2026-08-06_04-52-05_20.00sec_-0.00C_LIGHT_0436.fits
Previews of the CALIBRATED second-epoch images:


fd_Lyn-01-Q2b1x1_2026-08-06_04-51-27_20.00sec_-0.00C_LIGHT_0435.fits



fd_Lyn-01-Q2b1x1_2026-08-06_04-52-05_20.00sec_-0.00C_LIGHT_0436.fits




Updating neverexclude_list.txt
'/var/www/nmw_calibration/neverexclude_list.txt' -> './neverexclude_list.txt'
Choosing bad regions list
'/var/www/nmw_calibration/TTUQ2b1x1/TTUQ2_bad_region.lst' -> 'bad_region.lst'
wait
*------ default.sex.telephoto_lens_onlybrightstars_v1 ------*
'default.sex.telephoto_lens_onlybrightstars_v1' -> 'default.sex'
Starting VaST with default.sex.telephoto_lens_onlybrightstars_v1

  ./vast --noflagimage --starmatchraius 5 --matchstarnumber 500 --selectbestaperture --sysrem 0 --type 4 --maxsextractorflag 99 --UTC --nofind --nojdkeyword /data_ssd/NMW-TexasTech/reference_imgs/Lyn-01-Q2b1x1_2026-01-08_23-14-53_20.00sec_-15.00C_LIGHT_0201.fits /data_ssd/NMW-TexasTech/reference_imgs/Lyn-01-Q2b1x1_2026-02-11_00-13-56_20.00sec_-15.00C_LIGHT_0239.fits /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/fd_Lyn-01-Q2b1x1_2026-08-06_04-51-27_20.00sec_-0.00C_LIGHT_0435.fits /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/fd_Lyn-01-Q2b1x1_2026-08-06_04-52-05_20.00sec_-0.00C_LIGHT_0436.fits
  
Last  image: 2461258.91085498 06.08.2026 09:51:27.870 UTC
WARNING: VaST exited with code 1 on the field Lyn-01-Q2b1x1 AFTER completing the measurements. This is a memory-management crash during cleanup (a VaST bug to report), NOT a wrong field / clouds / bad focus. The lightcurves were written, so the transient search continues.
____ VaST output (crashed during memory cleanup; the measurements above are complete) ____

--==VaST 1.0rc90==--

Parsing command line arguments...
opt 'F': Will NOT create flag images for SExtractor
opt '5': 5.000000 pix is the new fixed star matching radius!
opt 'b': Using 500 reference stars for image matching!
opt '3': Will try to select best aperture for each source!
opt 'y': 0 SysRem iterations will be conducted!
opt 't 4': robust linear magnitude calibration (vary zero-point and slope)
opt 'x': 99 is the maximum acceptable SExtractor flag!
WARNING: disabling the mag-size filter in order not to reject blended stars.
opt 'u': Stick with UTC time system, no conversion to TT will be done!
opt 'f': Run ./find_candidates manually!
opt 'k': "JD" keyword in FITS image header will be ignored!
INFO from vast_remove_directory(): Could not open directory: symlinks_to_images
INFO from vast_remove_directory(): Could not open directory: converted_images
INFO from vast_remove_directory(): Could not open directory: unpacked_images

Checking the list of input images specified on the command line ...
WARNING from replace_file_with_symlink_if_filename_contains_white_spaces() the input file /data_ssd/NMW-TexasTech/reference_imgs/Lyn-01-Q2b1x1_2026-01-08_23-14-53_20.00sec_-15.00C_LIGHT_0201.fits is already a symlink and we do not allow symlinks on symlinks
WARNING from replace_file_with_symlink_if_filename_contains_white_spaces() the input file /data_ssd/NMW-TexasTech/reference_imgs/Lyn-01-Q2b1x1_2026-02-11_00-13-56_20.00sec_-15.00C_LIGHT_0239.fits is already a symlink and we do not allow symlinks on symlinks

Looking for the list of input images with time corrections in vast_list_of_input_images_with_time_corrections.txt ... list not found.
This is OK if you specify the input images on the command line, not through this text file.
Checking write permissions for the current directory (/data_ssd/NMW-TexasTech/workdir/vast_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011)...  OK
Found a system-wide installation of SExtractor
Cleaning old outNNNNN.dat files.
Done with cleaning!

 VaST was started with the following command line: 
./vast --noflagimage --starmatchraius 5 --matchstarnumber 500 --selectbestaperture --sysrem 0 --type 4 --maxsextractorflag 99 --UTC --nofind --nojdkeyword /data_ssd/NMW-TexasTech/reference_imgs/Lyn-01-Q2b1x1_2026-01-08_23-14-53_20.00sec_-15.00C_LIGHT_0201.fits /data_ssd/NMW-TexasTech/reference_imgs/Lyn-01-Q2b1x1_2026-02-11_00-13-56_20.00sec_-15.00C_LIGHT_0239.fits /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/fd_Lyn-01-Q2b1x1_2026-08-06_04-51-27_20.00sec_-0.00C_LIGHT_0435.fits /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/fd_Lyn-01-Q2b1x1_2026-08-06_04-52-05_20.00sec_-0.00C_LIGHT_0436.fits 


Preparing to process 4 input FITS images...


######## Forcing special settings for the transient detection ########
transient search mode: disabling the mag-size filter as it should be switched off when running a transient search!
transient search mode: disabling the bad image filter as it will not help during the transient search!
transient search mode: will not try to gues image saturation limit
transient search mode: no UTC-to-TT time system conversion will be performed!!!
transient search mode: setting the maximum acceptable SExtractor flag to 3
transient search mode: disabling rejectin of images with elliptical stars
transient search mode: not discarding large sources
################
Excluding image region:    -1.0    -1.0     1.0     1.0  (defined in bad_region.lst)
Excluding image region:  7500.0     0.0  9576.0  6388.0  (defined in bad_region.lst)
Excluding image region:  1122.0  1550.0  1124.0  1552.0  (defined in bad_region.lst)
Excluding image region:  1637.0  2824.0  1639.0  2826.0  (defined in bad_region.lst)
Excluding image region:  1831.0  2839.0  1833.0  2841.0  (defined in bad_region.lst)
Excluding image region:  1905.0  4570.0  1907.0  4572.0  (defined in bad_region.lst)
Excluding image region:  2012.0  4693.0  2014.0  4695.0  (defined in bad_region.lst)
Excluding image region:  2397.0  4241.0  2399.0  4243.0  (defined in bad_region.lst)
Excluding image region:  2679.0  2807.0  2681.0  2809.0  (defined in bad_region.lst)
Excluding more image regions!.. (will not print them all)
Excluded a total of 31 image regions  (defined in bad_region.lst).
Setting the fixed star match radius of 5.00 pix
We have 4 images to process.
SExtractor catalog cache: restored Lyn-01-Q2b1x1_2026-01-08_23-14-53_20.00sec_-15.00C_LIGHT_0201.fits catalog from cache
SExtractor catalog cache: restored Lyn-01-Q2b1x1_2026-02-11_00-13-56_20.00sec_-15.00C_LIGHT_0239.fits catalog from cache
Running SExtractor in 3 parallel threads...
Using the catalog image00001.cat SExtracted earlier from the image /data_ssd/NMW-TexasTech/reference_imgs/Lyn-01-Q2b1x1_2026-01-08_23-14-53_20.00sec_-15.00C_LIGHT_0201.fits
Using the catalog image00002.cat SExtracted earlier from the image /data_ssd/NMW-TexasTech/reference_imgs/Lyn-01-Q2b1x1_2026-02-11_00-13-56_20.00sec_-15.00C_LIGHT_0239.fits
The gain value (GAIN=0.370) from default.sex will be used for image /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/fd_Lyn-01-Q2b1x1_2026-08-06_04-51-27_20.00sec_-0.00C_LIGHT_0435.fits
The above guess is based on the non-default gain value specified in default.sex by user
Parent process says: we are done fork()ing.
Waiting for thread 2 to finish...
autodetect_aperture() is running SExtractor on /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/fd_Lyn-01-Q2b1x1_2026-08-06_04-51-27_20.00sec_-0.00C_LIGHT_0435.fits
Excluding image region:    -1.0    -1.0     1.0     1.0  (defined in bad_region.lst)
Excluding image region:  7500.0     0.0  9576.0  6388.0  (defined in bad_region.lst)
Excluding image region:  1122.0  1550.0  1124.0  1552.0  (defined in bad_region.lst)
Excluding image region:  1637.0  2824.0  1639.0  2826.0  (defined in bad_region.lst)
Excluding image region:  1831.0  2839.0  1833.0  2841.0  (defined in bad_region.lst)
Excluding image region:  1905.0  4570.0  1907.0  4572.0  (defined in bad_region.lst)
Excluding image region:  2012.0  4693.0  2014.0  4695.0  (defined in bad_region.lst)
Excluding image region:  2397.0  4241.0  2399.0  4243.0  (defined in bad_region.lst)
Excluding image region:  2679.0  2807.0  2681.0  2809.0  (defined in bad_region.lst)
Excluding more image regions!.. (will not print them all)
Excluded a total of 31 image regions  (defined in bad_region.lst).
autodetect_aperture() is doing a preliminary SExtractor run to determine an appropriate aperture size
sex -c default.sex  -PARAMETERS_NAME autodetect_aper.param -CATALOG_NAME autodetect_aper_image00003.cat  /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/fd_Lyn-01-Q2b1x1_2026-08-06_04-51-27_20.00sec_-0.00C_LIGHT_0435.fits > image00003.cat.sex_log 2>&1
The gain value (GAIN=0.370) from default.sex will be used for image /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/fd_Lyn-01-Q2b1x1_2026-08-06_04-52-05_20.00sec_-0.00C_LIGHT_0436.fits
The above guess is based on the non-default gain value specified in default.sex by user
autodetect_aperture() is running SExtractor on /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/fd_Lyn-01-Q2b1x1_2026-08-06_04-52-05_20.00sec_-0.00C_LIGHT_0436.fits
Excluding image region:    -1.0    -1.0     1.0     1.0  (defined in bad_region.lst)
Excluding image region:  7500.0     0.0  9576.0  6388.0  (defined in bad_region.lst)
Excluding image region:  1122.0  1550.0  1124.0  1552.0  (defined in bad_region.lst)
Excluding image region:  1637.0  2824.0  1639.0  2826.0  (defined in bad_region.lst)
Excluding image region:  1831.0  2839.0  1833.0  2841.0  (defined in bad_region.lst)
Excluding image region:  1905.0  4570.0  1907.0  4572.0  (defined in bad_region.lst)
Excluding image region:  2012.0  4693.0  2014.0  4695.0  (defined in bad_region.lst)
Excluding image region:  2397.0  4241.0  2399.0  4243.0  (defined in bad_region.lst)
Excluding image region:  2679.0  2807.0  2681.0  2809.0  (defined in bad_region.lst)
Excluding more image regions!.. (will not print them all)
Excluded a total of 31 image regions  (defined in bad_region.lst).
autodetect_aperture() is doing a preliminary SExtractor run to determine an appropriate aperture size
sex -c default.sex  -PARAMETERS_NAME autodetect_aper.param -CATALOG_NAME autodetect_aper_image00004.cat  /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/fd_Lyn-01-Q2b1x1_2026-08-06_04-52-05_20.00sec_-0.00C_LIGHT_0436.fits > image00004.cat.sex_log 2>&1
autodetect_aperture() is doing the main SExtractor run
sex  -PARAMETERS_NAME default.param -PHOT_APERTURES 6.4,6.4,5.7,7.0,7.7,8.3 -VERBOSE_TYPE NORMAL -CATALOG_NAME image00004.cat /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/fd_Lyn-01-Q2b1x1_2026-08-06_04-52-05_20.00sec_-0.00C_LIGHT_0436.fits > image00004.cat.sex_log 2>&1
autodetect_aperture() is doing the main SExtractor run
sex  -PARAMETERS_NAME default.param -PHOT_APERTURES 6.4,6.4,5.8,7.0,7.7,8.3 -VERBOSE_TYPE NORMAL -CATALOG_NAME image00003.cat /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/fd_Lyn-01-Q2b1x1_2026-08-06_04-51-27_20.00sec_-0.00C_LIGHT_0435.fits > image00003.cat.sex_log 2>&1
autodetect_aperture() is done with image /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/fd_Lyn-01-Q2b1x1_2026-08-06_04-51-27_20.00sec_-0.00C_LIGHT_0435.fits
Waiting for thread 1 to finish...
autodetect_aperture() is done with image /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/fd_Lyn-01-Q2b1x1_2026-08-06_04-52-05_20.00sec_-0.00C_LIGHT_0436.fits


Done with SExtractor!

TIMING SExtractor: 3 seconds


Matching stars between images!

No manually selected comparison stars file manually_selected_comparison_stars.lst which is fine.
Processing  /data_ssd/NMW-TexasTech/reference_imgs/Lyn-01-Q2b1x1_2026-01-08_23-14-53_20.00sec_-15.00C_LIGHT_0201.fits
9576x6388 FITS image /data_ssd/NMW-TexasTech/reference_imgs/Lyn-01-Q2b1x1_2026-01-08_23-14-53_20.00sec_-15.00C_LIGHT_0201.fits
Trying to guess the time system by parsing the comment string 'Time of observation (UTC)'
Time system set from the comment to DATE-OBS keyword: 'Time of observation (UTC)'
The input time system is identified as: UTC (blank if unknown)
Setting observation date using DATE-OBS keyword: 2026-01-09T05:14:53.5967901
Setting observation time using DATE-OBS keyword: 2026-01-09T05:14:53.5967901

Observing time converted to the "standard" FITS header format:
DATE-OBS= 2026-01-09T05:14:53.596
EXPTIME = 20.000

Using the catalog image00001.cat SExtracted earlier from the image /data_ssd/NMW-TexasTech/reference_imgs/Lyn-01-Q2b1x1_2026-01-08_23-14-53_20.00sec_-15.00C_LIGHT_0201.fits
Exposure 20 sec, 09.01.2026 05:14:53.596 UTC = JD(UTC) 2461049.71879162 mid. exp.
The reference image star  8241.788    16.017 is rejected, see bad_region.lst
The reference image star  7509.016    15.396 is rejected, see bad_region.lst
The reference image star  7768.416    12.898 is rejected, see bad_region.lst
The reference image star  7529.594    13.855 is rejected, see bad_region.lst
The reference image star  7754.117    12.686 is rejected, see bad_region.lst
The reference image star  8805.399     8.300 is rejected, see bad_region.lst
The reference image star  9058.437     7.193 is rejected, see bad_region.lst
The reference image star  8227.478     5.028 is rejected, see bad_region.lst
The reference image star  7661.536     2.268 is rejected, see bad_region.lst
The reference image star  7521.697    17.673 is rejected, see bad_region.lst
Excluding more reference image stars falling at bad regions!.. (will not print them all)
SExtractor output filtering results:
 * passed selection: 13866, (13865 good for image matching)
 * rejected as having no flux measurement: 0
 * rejected as having SNR<3.0: 0
 * rejected inside rectangles defined in bad_region.lst: 2976
 * rejected close to frame edge: 77
 * rejected as being too small (<1.5 pix): 0
 * rejected as being too large (>5.9 pix): 0
 * rejected as outliers in mag-size plot: 0
 * rejected as having SExtractor flags > 99 and <= 7: 0
 * rejected as having hopelessly bad SExtractor flags (>7): 2
 * rejected due to an external image flag: 0
 * rejected as having bad PSF fit: 0
---
You may change some of the filtering parameters by editing src/vast_limits.h and re-running 'make'.

Please note: the CCD position-dependent magnitude correction will be applied.
get_detection_limit_sn(): Detection limit: -7.44
Detection limit from the magnitude-SNR relation= -7.4  (5.0 sigma detection)
The simple faintest star detection limit= -9.6
80 percent brightest stars detection limit= -10.4
Selected detection limit= -10.4
Final detection limit= -10.4 (after subtracting MAG_TRANSIENT_ABOVE_THE_REFERENCE_FRAME_LIMIT=0.0)

Parameter box for transient search:    10.06.0 pix): 0
 * rejected as outliers in mag-size plot: 0
 * rejected as having SExtractor flags > 99 and <= 7: 0
 * rejected as having hopelessly bad SExtractor flags (>7): 11
 * rejected due to an external image flag: 0
 * rejected as having bad PSF fit: 0
---
You may change some of the filtering parameters by editing src/vast_limits.h and re-running 'make'.
     9605 * detected, using  346/ 500 * for reference/current image matching, fraction_of_ambiguous_matches= 0.002452, number_of_ambiguous_matches=34 
refining the coordinate transformation... [CVPOLY iter 1: order=2 pairs=7212 inliers=7212 rms 0.90 -> 0.25 pix, max corner correction 5.8 pix] fraction_of_ambiguous_matches= 0.001731, number_of_ambiguous_matches=24 
7210 * matched, [CVPOLY iter 2: order=1 pairs=7210 inliers=7210 rms 0.11 -> 0.11 pix, max corner correction 0.0 pix] fraction_of_ambiguous_matches= 0.001298, number_of_ambiguous_matches=18 
7210 * matched (2nd iteration). [CVPOLY iter 3: order=1 pairs=7210 inliers=7210 rms 0.11 -> 0.11 pix, max corner correction 0.0 pix] fraction_of_ambiguous_matches= 0.000793, number_of_ambiguous_matches=11 
7210 * matched (3rd iteration). Success!
  rotation [degrees] = 170.765
     9605 stars detected,  7210 stars matched
Performing magnitude calibration using automatically selected comparison stars
Expecting to find at least 40 * for magnitude calibration
We have N_good_stars = 6551, N_manually_selected_comparison_stars = 0
Using 6551 stars for magnitude calibration (before filtering).
Iteratively removing outliers from the linear mag-mag relation (unweighted fit)...
After removing outliers in (X,Y,dm) plane, we are left with 6549 stars for magnitude calibration.
Using the linear CCD position-dependent magnitude correction:
 delta_m = 0.00001*X_pix -0.00001*Y_pix -0.00631
Iteratively removing outliers from the mag-mag relation (weighted linear/polynomial fit)...
Computing robust linear magnitude calibration.
Used 6539 stars for magnitude calibration (after filtering).
get_detection_limit_sn(): Detection limit: -7.55
    16261 objects stored in memory (1000000 max.)
Magnitude calibration is performed successfully!
Saving observations to the cache... OK
memory:  203712 kB used, 238096 kB peak, 65263848 kB available RAM
processed 2 of 4 images ( 50.0%)



Processing  /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/fd_Lyn-01-Q2b1x1_2026-08-06_04-51-27_20.00sec_-0.00C_LIGHT_0435.fits
9576x6388 FITS image /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/fd_Lyn-01-Q2b1x1_2026-08-06_04-51-27_20.00sec_-0.00C_LIGHT_0435.fits
Trying to guess the time system by parsing the comment string 'Time of observation (UTC)'
Time system set from the comment to DATE-OBS keyword: 'Time of observation (UTC)'
The input time system is identified as: UTC (blank if unknown)
Setting observation date using DATE-OBS keyword: 2026-08-06T09:51:27.8703160
Setting observation time using DATE-OBS keyword: 2026-08-06T09:51:27.8703160

Observing time converted to the "standard" FITS header format:
DATE-OBS= 2026-08-06T09:51:27.870
EXPTIME = 20.000

Using the catalog image00003.cat SExtracted earlier from the image /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/fd_Lyn-01-Q2b1x1_2026-08-06_04-51-27_20.00sec_-0.00C_LIGHT_0435.fits
The star  9055.358  3507.809 is rejected, see bad_region.lst
The star  8185.855  3788.937 is rejected, see bad_region.lst
The star  9024.769  3874.089 is rejected, see bad_region.lst
The star  9284.051  3901.688 is rejected, see bad_region.lst
The star  9097.297  4178.419 is rejected, see bad_region.lst
The star  7694.756  4342.804 is rejected, see bad_region.lst
The star  9133.415  4635.331 is rejected, see bad_region.lst
The star  7618.956  4717.552 is rejected, see bad_region.lst
The star  9394.556  4719.223 is rejected, see bad_region.lst
The star  8871.184  4863.489 is rejected, see bad_region.lst
Excluding more stars falling at bad regions!.. (will not print them all)
SExtractor output filtering results:
 * passed selection: 870
 * rejected as having no flux measurement: 0
 * rejected as having SNR<3.0: 0
 * rejected inside rectangles defined in bad_region.lst: 25
 * rejected close to frame edge: 4
 * rejected as being too small (<1.6 pix): 0
 * rejected as being too large (>6.4 pix): 0
 * rejected as outliers in mag-size plot: 0
 * rejected as having SExtractor flags > 99 and <= 7: 0
 * rejected as having hopelessly bad SExtractor flags (>7): 0
 * rejected due to an external image flag: 0
 * rejected as having bad PSF fit: 0
---
You may change some of the filtering parameters by editing src/vast_limits.h and re-running 'make'.
      870 * detected, using  100/ 500 * for reference/current image matching, fraction_of_ambiguous_matches= 0.000000, number_of_ambiguous_matches=0 
refining the coordinate transformation... [CVPOLY iter 1: order=2 pairs=820 inliers=820 rms 0.44 -> 0.13 pix, max corner correction 5.7 pix] fraction_of_ambiguous_matches= 0.000000, number_of_ambiguous_matches=0 
820 * matched, [CVPOLY iter 2: order=1 pairs=820 inliers=820 rms 0.13 -> 0.13 pix, max corner correction 0.0 pix] fraction_of_ambiguous_matches= 0.000000, number_of_ambiguous_matches=0 
820 * matched (2nd iteration). [CVPOLY iter 3: order=1 pairs=820 inliers=820 rms 0.13 -> 0.13 pix, max corner correction 0.0 pix] fraction_of_ambiguous_matches= 0.000000, number_of_ambiguous_matches=0 
820 * matched (3rd iteration). Success!
  rotation [degrees] =  -3.578
      870 stars detected,   820 stars matched
Performing magnitude calibration using automatically selected comparison stars
Expecting to find at least 40 * for magnitude calibration
We have N_good_stars = 525, N_manually_selected_comparison_stars = 0
Using 525 stars for magnitude calibration (before filtering).
Iteratively removing outliers from the linear mag-mag relation (unweighted fit)...
After removing outliers in (X,Y,dm) plane, we are left with 492 stars for magnitude calibration.
Using the linear CCD position-dependent magnitude correction:
 delta_m = 0.00021*X_pix -0.00005*Y_pix +0.02228
ERROR in magnitude calibration: fabs(lin_mag_A * X_im_size + lin_mag_C) > MAX_LIN_CORR_MAG
ERROR in magnitude calibration: fabs(lin_mag_A * X_im_size + lin_mag_B * Y_im_size + lin_mag_C) > MAX_LIN_CORR_MAG
Used 492 stars for magnitude calibration (after filtering).
get_detection_limit_sn(): Detection limit: -8.52
 ERROR!!! Magnitude calibration failure. Dropping image. 
    16261 objects stored in memory (1000000 max.)
memory:  203652 kB used, 238096 kB peak, 65263848 kB available RAM
processed 3 of 4 images ( 75.0%)



Processing  /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/fd_Lyn-01-Q2b1x1_2026-08-06_04-52-05_20.00sec_-0.00C_LIGHT_0436.fits
9576x6388 FITS image /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/fd_Lyn-01-Q2b1x1_2026-08-06_04-52-05_20.00sec_-0.00C_LIGHT_0436.fits
Trying to guess the time system by parsing the comment string 'Time of observation (UTC)'
Time system set from the comment to DATE-OBS keyword: 'Time of observation (UTC)'
The input time system is identified as: UTC (blank if unknown)
Setting observation date using DATE-OBS keyword: 2026-08-06T09:52:05.1792267
Setting observation time using DATE-OBS keyword: 2026-08-06T09:52:05.1792267

Observing time converted to the "standard" FITS header format:
DATE-OBS= 2026-08-06T09:52:05.179
EXPTIME = 20.000

Using the catalog image00004.cat SExtracted earlier from the image /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/fd_Lyn-01-Q2b1x1_2026-08-06_04-52-05_20.00sec_-0.00C_LIGHT_0436.fits
The star  9150.598   826.528 is rejected, see bad_region.lst
The star  9054.038  3507.248 is rejected, see bad_region.lst
The star  8184.431  3788.276 is rejected, see bad_region.lst
The star  9023.563  3873.487 is rejected, see bad_region.lst
The star  9282.741  3901.047 is rejected, see bad_region.lst
The star  7856.470  4022.691 is rejected, see bad_region.lst
The star  8806.542  4092.201 is rejected, see bad_region.lst
The star  9095.917  4177.951 is rejected, see bad_region.lst
The star  8583.677  4310.415 is rejected, see bad_region.lst
The star  7693.377  4342.172 is rejected, see bad_region.lst
Excluding more stars falling at bad regions!.. (will not print them all)
SExtractor output filtering results:
 * passed selection: 666
 * rejected as having no flux measurement: 0
 * rejected as having SNR<3.0: 0
 * rejected inside rectangles defined in bad_region.lst: 32
 * rejected close to frame edge: 4
 * rejected as being too small (<1.6 pix): 0
 * rejected as being too large (>6.4 pix): 0
 * rejected as outliers in mag-size plot: 0
 * rejected as having SExtractor flags > 99 and <= 7: 0
 * rejected as having hopelessly bad SExtractor flags (>7): 0
 * rejected due to an external image flag: 0
 * rejected as having bad PSF fit: 0
---
You may change some of the filtering parameters by editing src/vast_limits.h and re-running 'make'.
      666 * detected, using  100/ 500 * for reference/current image matching, fraction_of_ambiguous_matches= 0.000000, number_of_ambiguous_matches=0 
refining the coordinate transformation... [CVPOLY iter 1: order=2 pairs=628 inliers=628 rms 0.59 -> 0.12 pix, max corner correction 8.6 pix] fraction_of_ambiguous_matches= 0.000000, number_of_ambiguous_matches=0 
628 * matched, [CVPOLY iter 2: order=1 pairs=628 inliers=628 rms 0.12 -> 0.12 pix, max corner correction 0.0 pix] fraction_of_ambiguous_matches= 0.000000, number_of_ambiguous_matches=0 
628 * matched (2nd iteration). [CVPOLY iter 3: order=1 pairs=628 inliers=628 rms 0.12 -> 0.12 pix, max corner correction 0.0 pix] fraction_of_ambiguous_matches= 0.000000, number_of_ambiguous_matches=0 
628 * matched (3rd iteration). Success!
  rotation [degrees] =  -3.579
      666 stars detected,   628 stars matched
Performing magnitude calibration using automatically selected comparison stars
Expecting to find at least 40 * for magnitude calibration
We have N_good_stars = 385, N_manually_selected_comparison_stars = 0
Using 385 stars for magnitude calibration (before filtering).
Iteratively removing outliers from the linear mag-mag relation (unweighted fit)...
After removing outliers in (X,Y,dm) plane, we are left with 364 stars for magnitude calibration.
Using the linear CCD position-dependent magnitude correction:
 delta_m = 0.00015*X_pix -0.00002*Y_pix +0.00336
ERROR in magnitude calibration: fabs(lin_mag_A * X_im_size + lin_mag_C) > MAX_LIN_CORR_MAG
ERROR in magnitude calibration: fabs(lin_mag_A * X_im_size + lin_mag_B * Y_im_size + lin_mag_C) > MAX_LIN_CORR_MAG
Used 364 stars for magnitude calibration (after filtering).
get_detection_limit_sn(): Detection limit: -8.53
 ERROR!!! Magnitude calibration failure. Dropping image. 
    16261 objects stored in memory (1000000 max.)
memory:  203652 kB used, 238096 kB peak, 65263848 kB available RAM
processed 4 of 4 images (100.0%)
TIMING matching_and_photometry: 1 seconds
Done with measurements! =)

Total number of measurements 23471 (23471 measurements stored in RAM)
Freeing up some memory...  Sorting the measurements cached in memory...
Writing lightcurve (outNNNNN.dat) files...
TIMING lightcurve_write: 0 seconds
The lightcurve files have been written, freeing up more memory...
Creating vast_image_details.log ... 

Writing summary file: vast_summary.log ...  OK
Selecting the best aperture for each source
Aperture with index 0 (REFERENCE_APERTURE_DIAMETER +0.00*REFERENCE_APERTURE_DIAMETER) seems best for  1266 stars
Aperture with index 1 (REFERENCE_APERTURE_DIAMETER +0.00*REFERENCE_APERTURE_DIAMETER) seems best for     0 stars
Aperture with index 2 (REFERENCE_APERTURE_DIAMETER -0.10*REFERENCE_APERTURE_DIAMETER) seems best for  2614 stars
Aperture with index 3 (REFERENCE_APERTURE_DIAMETER +0.10*REFERENCE_APERTURE_DIAMETER) seems best for   839 stars
Aperture with index 4 (REFERENCE_APERTURE_DIAMETER +0.20*REFERENCE_APERTURE_DIAMETER) seems best for   784 stars
Aperture with index 5 (REFERENCE_APERTURE_DIAMETER +0.30*REFERENCE_APERTURE_DIAMETER) seems best for  1707 stars

done!  =)
TIMING select_aperture: 1 seconds
WARNING: Can't open candidates-transients.lst for reading! -- No candidates found?
Non-zero exit code of lib/transient_list
ERROR running  lib/create_list_of_candidate_transients.sh
Computing lightcurve statistics...  Will not compute variability indexes for objects having <1 points in lightcurve
You may disable this by commenting out the line '#define DROP_LIGHTCURVES_WITH_SMALL_NUMBER_OF_POINTS_FROM_ALL_PLOTS' in src/vast_limits.h an re-compiling VaST with 'make'

Computing, please wait a bit
.......................................................................
vast_lightcurve_statistics.log: 7151 objects, the longest string is 386 bytes.
Allocating memory for resorting the file.



----***** VaST processing WARNING *****----
You asked VaST to process 4 images, but only 1 were actually matched to the reference one.
Please investigate this!



**************************************************************
This error might be a bug, but it is far more likely that it is caused by 
inappropriate input data. A few simple things to check in the diagnostic
messages printed above (or the vast*.log files):
 * How many of the input images are matched?
 * Does the number of detected stars on each image look reasonable?
 * Do images have a sufficient overlap of at least about 20 percent?

You may run
 ./sextract_single_image /path/to/my/image/file.fit
to see how well VaST detects stars with the current SExtractor settings
(star detection settings can be changed in the default.sex configuration
file, see various examples in the VaST directory).

If you cannot identify the problem, please e-mail Kirill Sokolovsky 
Please try to describe the problem in details and, if possible, attach vast_summary.log
file and a few example images. If the images are too big to be sent by e-mail, please 
upload them through a web-form http://scan.sai.msu.ru/upload/
**************************************************************

Low percentage of matched images - we'll declare this an unsuccessful VaST run (exit code 1)
_____________________
SExtractor catalog cache: saved Lyn-01-Q2b1x1_2026-01-08_23-14-53_20.00sec_-15.00C_LIGHT_0201.fits.cat to cache
SExtractor catalog cache: saved Lyn-01-Q2b1x1_2026-02-11_00-13-56_20.00sec_-15.00C_LIGHT_0239.fits.cat to cache
VaST run complete with default.sex.telephoto_lens_onlybrightstars_v1
The four input images were /data_ssd/NMW-TexasTech/reference_imgs/Lyn-01-Q2b1x1_2026-01-08_23-14-53_20.00sec_-15.00C_LIGHT_0201.fits /data_ssd/NMW-TexasTech/reference_imgs/Lyn-01-Q2b1x1_2026-02-11_00-13-56_20.00sec_-15.00C_LIGHT_0239.fits /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/fd_Lyn-01-Q2b1x1_2026-08-06_04-51-27_20.00sec_-0.00C_LIGHT_0435.fits /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/fd_Lyn-01-Q2b1x1_2026-08-06_04-52-05_20.00sec_-0.00C_LIGHT_0436.fits
Last  image: 2461258.91085498 06.08.2026 09:51:27.870 UTC
ERROR running VaST on the field Lyn-01-Q2b1x1 (less than 4 images processed)
exp_start= 09.01.2026 05:14:53.596  exp=   20.000  JD= 2461049.71879162  ap=  5.9  rotation=   0.000  *detected= 13866  *matched= 13866  status=OK     /data_ssd/NMW-TexasTech/reference_imgs/Lyn-01-Q2b1x1_2026-01-08_23-14-53_20.00sec_-15.00C_LIGHT_0201.fits
exp_start= 11.02.2026 06:13:56.094  exp=   20.000  JD= 2461082.75979275  ap=  6.0  rotation= 170.765  *detected=  9605  *matched=  7210  status=OK     /data_ssd/NMW-TexasTech/reference_imgs/Lyn-01-Q2b1x1_2026-02-11_00-13-56_20.00sec_-15.00C_LIGHT_0239.fits
exp_start= 06.08.2026 09:51:27.870  exp=   20.000  JD= 2461258.91085498  ap=  6.4  rotation=  -3.578  *detected=   870  *matched=   820  status=ERROR  /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/fd_Lyn-01-Q2b1x1_2026-08-06_04-51-27_20.00sec_-0.00C_LIGHT_0435.fits
exp_start= 06.08.2026 09:52:05.179  exp=   20.000  JD= 2461258.91128679  ap=  6.4  rotation=  -3.579  *detected=   666  *matched=   628  status=ERROR  /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/fd_Lyn-01-Q2b1x1_2026-08-06_04-52-05_20.00sec_-0.00C_LIGHT_0436.fits
wait
*------ default.sex.telephoto_lens_vSTL ------*
'default.sex.telephoto_lens_vSTL' -> 'default.sex'
Starting VaST with default.sex.telephoto_lens_vSTL

  ./vast --noflagimage --starmatchraius 5 --matchstarnumber 500 --selectbestaperture --sysrem 0 --type 4 --maxsextractorflag 99 --UTC --nofind --nojdkeyword /data_ssd/NMW-TexasTech/reference_imgs/Lyn-01-Q2b1x1_2026-01-08_23-14-53_20.00sec_-15.00C_LIGHT_0201.fits /data_ssd/NMW-TexasTech/reference_imgs/Lyn-01-Q2b1x1_2026-02-11_00-13-56_20.00sec_-15.00C_LIGHT_0239.fits /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/fd_Lyn-01-Q2b1x1_2026-08-06_04-51-27_20.00sec_-0.00C_LIGHT_0435.fits /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/fd_Lyn-01-Q2b1x1_2026-08-06_04-52-05_20.00sec_-0.00C_LIGHT_0436.fits
  
Last  image: 2461258.91085498 06.08.2026 09:51:27.870 UTC
WARNING: VaST exited with code 1 on the field Lyn-01-Q2b1x1 AFTER completing the measurements. This is a memory-management crash during cleanup (a VaST bug to report), NOT a wrong field / clouds / bad focus. The lightcurves were written, so the transient search continues.
____ VaST output (crashed during memory cleanup; the measurements above are complete) ____

--==VaST 1.0rc90==--

Parsing command line arguments...
opt 'F': Will NOT create flag images for SExtractor
opt '5': 5.000000 pix is the new fixed star matching radius!
opt 'b': Using 500 reference stars for image matching!
opt '3': Will try to select best aperture for each source!
opt 'y': 0 SysRem iterations will be conducted!
opt 't 4': robust linear magnitude calibration (vary zero-point and slope)
opt 'x': 99 is the maximum acceptable SExtractor flag!
WARNING: disabling the mag-size filter in order not to reject blended stars.
opt 'u': Stick with UTC time system, no conversion to TT will be done!
opt 'f': Run ./find_candidates manually!
opt 'k': "JD" keyword in FITS image header will be ignored!
INFO from vast_remove_directory(): Could not open directory: symlinks_to_images
INFO from vast_remove_directory(): Could not open directory: converted_images
INFO from vast_remove_directory(): Could not open directory: unpacked_images

Checking the list of input images specified on the command line ...
WARNING from replace_file_with_symlink_if_filename_contains_white_spaces() the input file /data_ssd/NMW-TexasTech/reference_imgs/Lyn-01-Q2b1x1_2026-01-08_23-14-53_20.00sec_-15.00C_LIGHT_0201.fits is already a symlink and we do not allow symlinks on symlinks
WARNING from replace_file_with_symlink_if_filename_contains_white_spaces() the input file /data_ssd/NMW-TexasTech/reference_imgs/Lyn-01-Q2b1x1_2026-02-11_00-13-56_20.00sec_-15.00C_LIGHT_0239.fits is already a symlink and we do not allow symlinks on symlinks

Looking for the list of input images with time corrections in vast_list_of_input_images_with_time_corrections.txt ... list not found.
This is OK if you specify the input images on the command line, not through this text file.
Checking write permissions for the current directory (/data_ssd/NMW-TexasTech/workdir/vast_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011)...  OK
Found a system-wide installation of SExtractor
Cleaning old outNNNNN.dat files.
Done with cleaning!

 VaST was started with the following command line: 
./vast --noflagimage --starmatchraius 5 --matchstarnumber 500 --selectbestaperture --sysrem 0 --type 4 --maxsextractorflag 99 --UTC --nofind --nojdkeyword /data_ssd/NMW-TexasTech/reference_imgs/Lyn-01-Q2b1x1_2026-01-08_23-14-53_20.00sec_-15.00C_LIGHT_0201.fits /data_ssd/NMW-TexasTech/reference_imgs/Lyn-01-Q2b1x1_2026-02-11_00-13-56_20.00sec_-15.00C_LIGHT_0239.fits /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/fd_Lyn-01-Q2b1x1_2026-08-06_04-51-27_20.00sec_-0.00C_LIGHT_0435.fits /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/fd_Lyn-01-Q2b1x1_2026-08-06_04-52-05_20.00sec_-0.00C_LIGHT_0436.fits 


Preparing to process 4 input FITS images...


######## Forcing special settings for the transient detection ########
transient search mode: disabling the mag-size filter as it should be switched off when running a transient search!
transient search mode: disabling the bad image filter as it will not help during the transient search!
transient search mode: will not try to gues image saturation limit
transient search mode: no UTC-to-TT time system conversion will be performed!!!
transient search mode: setting the maximum acceptable SExtractor flag to 3
transient search mode: disabling rejectin of images with elliptical stars
transient search mode: not discarding large sources
################
Excluding image region:    -1.0    -1.0     1.0     1.0  (defined in bad_region.lst)
Excluding image region:  7500.0     0.0  9576.0  6388.0  (defined in bad_region.lst)
Excluding image region:  1122.0  1550.0  1124.0  1552.0  (defined in bad_region.lst)
Excluding image region:  1637.0  2824.0  1639.0  2826.0  (defined in bad_region.lst)
Excluding image region:  1831.0  2839.0  1833.0  2841.0  (defined in bad_region.lst)
Excluding image region:  1905.0  4570.0  1907.0  4572.0  (defined in bad_region.lst)
Excluding image region:  2012.0  4693.0  2014.0  4695.0  (defined in bad_region.lst)
Excluding image region:  2397.0  4241.0  2399.0  4243.0  (defined in bad_region.lst)
Excluding image region:  2679.0  2807.0  2681.0  2809.0  (defined in bad_region.lst)
Excluding more image regions!.. (will not print them all)
Excluded a total of 31 image regions  (defined in bad_region.lst).
Setting the fixed star match radius of 5.00 pix
We have 4 images to process.
SExtractor catalog cache: restored Lyn-01-Q2b1x1_2026-01-08_23-14-53_20.00sec_-15.00C_LIGHT_0201.fits catalog from cache
SExtractor catalog cache: restored Lyn-01-Q2b1x1_2026-02-11_00-13-56_20.00sec_-15.00C_LIGHT_0239.fits catalog from cache
Running SExtractor in 3 parallel threads...
Using the catalog image00001.cat SExtracted earlier from the image /data_ssd/NMW-TexasTech/reference_imgs/Lyn-01-Q2b1x1_2026-01-08_23-14-53_20.00sec_-15.00C_LIGHT_0201.fits
The gain value (GAIN=0.830) from default.sex will be used for image /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/fd_Lyn-01-Q2b1x1_2026-08-06_04-51-27_20.00sec_-0.00C_LIGHT_0435.fits
The above guess is based on the non-default gain value specified in default.sex by user
Using the catalog image00002.cat SExtracted earlier from the image /data_ssd/NMW-TexasTech/reference_imgs/Lyn-01-Q2b1x1_2026-02-11_00-13-56_20.00sec_-15.00C_LIGHT_0239.fits
The gain value (GAIN=0.830) from default.sex will be used for image /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/fd_Lyn-01-Q2b1x1_2026-08-06_04-52-05_20.00sec_-0.00C_LIGHT_0436.fits
The above guess is baautodetect_aperture() is running SExtractor on /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1sed on the non-default gain value specified in default.sex by user
_108974_qsh11011/fd_Lyn-01-Q2b1x1_2026-08-06_04-51-27_20.00sec_-0.00C_LIGHT_0435.fits
Excluding image region:    -1.0    -1.0     1.0     1.0  (defined in bad_region.lst)
Excluding image region:  7500.0     0.0  9576.0  6388.0  (defined in bad_region.lst)
Excluding image region:  1122.0  1550.0  1124.0  1552.0  (defined in bad_region.lst)
Excluding image region:  1637.0  2824.0  1639.0  2826.0  (defined in bad_region.lst)
Excluding image region:  1831.0  2839.0  1833.0  2841.0  (defined in bad_region.lst)
Excluding image region:  1905.0  4570.0  1907.0  4572.0  (defined in bad_region.lst)
Excluding image region:  2012.0  4693.0  2014.0  4695.0  (defined in bad_region.lst)
Excluding image region:  2397.0  4241.0  2399.0  4243.0  (defined in bad_region.lst)
Excluding image region:  2679.0  2807.0  2681.0  2809.0  (defined in bad_region.lst)
Excluding more image regions!.. (will not print them all)
Excluded a total of 31 image regions  (defined in bad_region.lst).
autodetect_aperture() is doing a preliminary SExtractor run to determine an appropriate aperture size
sex -c default.sex  -PARAMETERS_NAME autodetect_aper.param -CATALOG_NAME autodetect_aper_image00003.cat  /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/fd_Lyn-01-Q2b1x1_2026-08-06_04-51-27_20.00sec_-0.00C_LIGHT_0435.fits > image00003.cat.sex_log 2>&1
Parent process says: we are done fork()ing.
Waiting for thread 2 to finish...
autodetect_aperture() is running SExtractor on /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/fd_Lyn-01-Q2b1x1_2026-08-06_04-52-05_20.00sec_-0.00C_LIGHT_0436.fits
Excluding image region:    -1.0    -1.0     1.0     1.0  (defined in bad_region.lst)
Excluding image region:  7500.0     0.0  9576.0  6388.0  (defined in bad_region.lst)
Excluding image region:  1122.0  1550.0  1124.0  1552.0  (defined in bad_region.lst)
Excluding image region:  1637.0  2824.0  1639.0  2826.0  (defined in bad_region.lst)
Excluding image region:  1831.0  2839.0  1833.0  2841.0  (defined in bad_region.lst)
Excluding image region:  1905.0  4570.0  1907.0  4572.0  (defined in bad_region.lst)
Excluding image region:  2012.0  4693.0  2014.0  4695.0  (defined in bad_region.lst)
Excluding image region:  2397.0  4241.0  2399.0  4243.0  (defined in bad_region.lst)
Excluding image region:  2679.0  2807.0  2681.0  2809.0  (defined in bad_region.lst)
Excluding more image regions!.. (will not print them all)
Excluded a total of 31 image regions  (defined in bad_region.lst).
autodetect_aperture() is doing a preliminary SExtractor run to determine an appropriate aperture size
sex -c default.sex  -PARAMETERS_NAME autodetect_aper.param -CATALOG_NAME autodetect_aper_image00004.cat  /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/fd_Lyn-01-Q2b1x1_2026-08-06_04-52-05_20.00sec_-0.00C_LIGHT_0436.fits > image00004.cat.sex_log 2>&1
autodetect_aperture() is doing the main SExtractor run
sex  -PARAMETERS_NAME default.param -PHOT_APERTURES 4.7,4.7,4.3,5.2,5.7,6.1 -VERBOSE_TYPE NORMAL -CATALOG_NAME image00004.cat /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/fd_Lyn-01-Q2b1x1_2026-08-06_04-52-05_20.00sec_-0.00C_LIGHT_0436.fits > image00004.cat.sex_log 2>&1
autodetect_aperture() is doing the main SExtractor run
sex  -PARAMETERS_NAME default.param -PHOT_APERTURES 4.8,4.8,4.4,5.3,5.8,6.3 -VERBOSE_TYPE NORMAL -CATALOG_NAME image00003.cat /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/fd_Lyn-01-Q2b1x1_2026-08-06_04-51-27_20.00sec_-0.00C_LIGHT_0435.fits > image00003.cat.sex_log 2>&1
autodetect_aperture() is done with image /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/fd_Lyn-01-Q2b1x1_2026-08-06_04-52-05_20.00sec_-0.00C_LIGHT_0436.fits
Waiting for thread 1 to finish...
autodetect_aperture() is done with image /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/fd_Lyn-01-Q2b1x1_2026-08-06_04-51-27_20.00sec_-0.00C_LIGHT_0435.fits


Done with SExtractor!

TIMING SExtractor: 6 seconds


Matching stars between images!

No manually selected comparison stars file manually_selected_comparison_stars.lst which is fine.
Processing  /data_ssd/NMW-TexasTech/reference_imgs/Lyn-01-Q2b1x1_2026-01-08_23-14-53_20.00sec_-15.00C_LIGHT_0201.fits
9576x6388 FITS image /data_ssd/NMW-TexasTech/reference_imgs/Lyn-01-Q2b1x1_2026-01-08_23-14-53_20.00sec_-15.00C_LIGHT_0201.fits
Trying to guess the time system by parsing the comment string 'Time of observation (UTC)'
Time system set from the comment to DATE-OBS keyword: 'Time of observation (UTC)'
The input time system is identified as: UTC (blank if unknown)
Setting observation date using DATE-OBS keyword: 2026-01-09T05:14:53.5967901
Setting observation time using DATE-OBS keyword: 2026-01-09T05:14:53.5967901

Observing time converted to the "standard" FITS header format:
DATE-OBS= 2026-01-09T05:14:53.596
EXPTIME = 20.000

Using the catalog image00001.cat SExtracted earlier from the image /data_ssd/NMW-TexasTech/reference_imgs/Lyn-01-Q2b1x1_2026-01-08_23-14-53_20.00sec_-15.00C_LIGHT_0201.fits
Exposure 20 sec, 09.01.2026 05:14:53.596 UTC = JD(UTC) 2461049.71879162 mid. exp.
The reference image star  9562.632    29.249 is rejected, see bad_region.lst
The reference image star  8342.745    18.960 is rejected, see bad_region.lst
The reference image star  8338.787    14.838 is rejected, see bad_region.lst
The reference image star  7521.696    17.674 is rejected, see bad_region.lst
The reference image star  8241.786    16.018 is rejected, see bad_region.lst
The reference image star  8283.926    16.826 is rejected, see bad_region.lst
The reference image star  8038.348    16.376 is rejected, see bad_region.lst
The reference image star  7509.016    15.396 is rejected, see bad_region.lst
The reference image star  7768.415    12.899 is rejected, see bad_region.lst
The reference image star  7721.095    12.892 is rejected, see bad_region.lst
Excluding more reference image stars falling at bad regions!.. (will not print them all)
SExtractor output filtering results:
 * passed selection: 94315, (94313 good for image matching)
 * rejected as having no flux measurement: 0
 * rejected as having SNR<3.0: 18
 * rejected inside rectangles defined in bad_region.lst: 14851
 * rejected close to frame edge: 414
 * rejected as being too small (<1.1 pix): 0
 * rejected as being too large (>4.5 pix): 0
 * rejected as outliers in mag-size plot: 0
 * rejected as having SExtractor flags > 99 and <= 7: 0
 * rejected as having hopelessly bad SExtractor flags (>7): 76
 * rejected due to an external image flag: 0
 * rejected as having bad PSF fit: 0
---
You may change some of the filtering parameters by editing src/vast_limits.h and re-running 'make'.

Please note: the CCD position-dependent magnitude correction will be applied.
get_detection_limit_sn(): Detection limit: -7.13
Detection limit from the magnitude-SNR relation= -7.1  (5.0 sigma detection)
The simple faintest star detection limit= -6.5
80 percent brightest stars detection limit= -7.6
Selected detection limit= -7.6
Final detection limit= -7.6 (after subtracting MAG_TRANSIENT_ABOVE_THE_REFERENCE_FRAME_LIMIT=0.0)

Parameter box for transient search:    10.04.5 pix): 0
 * rejected as outliers in mag-size plot: 0
 * rejected as having SExtractor flags > 99 and <= 7: 0
 * rejected as having hopelessly bad SExtractor flags (>7): 58
 * rejected due to an external image flag: 0
 * rejected as having bad PSF fit: 0
---
You may change some of the filtering parameters by editing src/vast_limits.h and re-running 'make'.
    71185 * detected, using  377/ 500 * for reference/current image matching, fraction_of_ambiguous_matches= 0.005301, number_of_ambiguous_matches=500 
refining the coordinate transformation... [CVPOLY iter 1: order=2 pairs=53138 inliers=53138 rms 0.92 -> 0.29 pix, max corner correction 5.6 pix] fraction_of_ambiguous_matches= 0.005153, number_of_ambiguous_matches=486 
53150 * matched, [CVPOLY iter 2: order=1 pairs=53150 inliers=53150 rms 0.29 -> 0.29 pix, max corner correction 0.0 pix] fraction_of_ambiguous_matches= 0.005164, number_of_ambiguous_matches=487 
53150 * matched (2nd iteration). [CVPOLY iter 3: order=1 pairs=53150 inliers=53150 rms 0.29 -> 0.29 pix, max corner correction 0.0 pix] fraction_of_ambiguous_matches= 0.003350, number_of_ambiguous_matches=316 
53131 * matched (3rd iteration). Success!
  rotation [degrees] = 170.774
    71185 stars detected, 53131 stars matched
Performing magnitude calibration using automatically selected comparison stars
Expecting to find at least 40 * for magnitude calibration
We have N_good_stars = 47727, N_manually_selected_comparison_stars = 0
Using 47727 stars for magnitude calibration (before filtering).
Iteratively removing outliers from the linear mag-mag relation (unweighted fit)...
After removing outliers in (X,Y,dm) plane, we are left with 47721 stars for magnitude calibration.
Using the linear CCD position-dependent magnitude correction:
 delta_m = 0.00001*X_pix -0.00001*Y_pix -0.02382
Iteratively removing outliers from the mag-mag relation (weighted linear/polynomial fit)...
Computing robust linear magnitude calibration.
Used 37347 stars for magnitude calibration (after filtering).
get_detection_limit_sn(): Detection limit: -7.19
    112369 objects stored in memory (1000000 max.)
Magnitude calibration is performed successfully!
Saving observations to the cache... OK
memory:  264116 kB used, 301732 kB peak, 65263848 kB available RAM
processed 2 of 4 images ( 50.0%)



Processing  /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/fd_Lyn-01-Q2b1x1_2026-08-06_04-51-27_20.00sec_-0.00C_LIGHT_0435.fits
9576x6388 FITS image /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/fd_Lyn-01-Q2b1x1_2026-08-06_04-51-27_20.00sec_-0.00C_LIGHT_0435.fits
Trying to guess the time system by parsing the comment string 'Time of observation (UTC)'
Time system set from the comment to DATE-OBS keyword: 'Time of observation (UTC)'
The input time system is identified as: UTC (blank if unknown)
Setting observation date using DATE-OBS keyword: 2026-08-06T09:51:27.8703160
Setting observation time using DATE-OBS keyword: 2026-08-06T09:51:27.8703160

Observing time converted to the "standard" FITS header format:
DATE-OBS= 2026-08-06T09:51:27.870
EXPTIME = 20.000

Using the catalog image00003.cat SExtracted earlier from the image /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/fd_Lyn-01-Q2b1x1_2026-08-06_04-51-27_20.00sec_-0.00C_LIGHT_0435.fits
The star  8900.002   509.976 is rejected, see bad_region.lst
The star  9016.062  1024.770 is rejected, see bad_region.lst
The star  9289.139  1359.253 is rejected, see bad_region.lst
The star  1123.004  1550.996 is rejected, see bad_region.lst
The star  7650.802  1635.931 is rejected, see bad_region.lst
The star  9291.248  1688.561 is rejected, see bad_region.lst
The star  9504.632  1829.013 is rejected, see bad_region.lst
The star  9505.974  1829.865 is rejected, see bad_region.lst
The star  9233.067  1832.490 is rejected, see bad_region.lst
The star  8055.223  2012.008 is rejected, see bad_region.lst
Excluding more stars falling at bad regions!.. (will not print them all)
SExtractor output filtering results:
 * passed selection: 8128
 * rejected as having no flux measurement: 0
 * rejected as having SNR<3.0: 1
 * rejected inside rectangles defined in bad_region.lst: 193
 * rejected close to frame edge: 52
 * rejected as being too small (<1.2 pix): 0
 * rejected as being too large (>4.8 pix): 0
 * rejected as outliers in mag-size plot: 0
 * rejected as having SExtractor flags > 99 and <= 7: 0
 * rejected as having hopelessly bad SExtractor flags (>7): 32
 * rejected due to an external image flag: 0
 * rejected as having bad PSF fit: 0
---
You may change some of the filtering parameters by editing src/vast_limits.h and re-running 'make'.
     8128 * detected, using  100/ 500 * for reference/current image matching, fraction_of_ambiguous_matches= 0.000133, number_of_ambiguous_matches=15 
refining the coordinate transformation... [CVPOLY iter 1: order=3 pairs=7608 inliers=7608 rms 0.77 -> 0.32 pix, max corner correction 11.2 pix] fraction_of_ambiguous_matches= 0.000116, number_of_ambiguous_matches=13 
7609 * matched, [CVPOLY iter 2: order=1 pairs=7609 inliers=7609 rms 0.30 -> 0.30 pix, max corner correction 0.1 pix] fraction_of_ambiguous_matches= 0.000116, number_of_ambiguous_matches=13 
7609 * matched (2nd iteration). [CVPOLY iter 3: order=1 pairs=7609 inliers=7609 rms 0.30 -> 0.30 pix, max corner correction 0.0 pix] fraction_of_ambiguous_matches= 0.000080, number_of_ambiguous_matches=9 
7604 * matched (3rd iteration). Success!
  rotation [degrees] =  -3.585
     8128 stars detected,  7604 stars matched
Performing magnitude calibration using automatically selected comparison stars
Expecting to find at least 40 * for magnitude calibration
We have N_good_stars = 6010, N_manually_selected_comparison_stars = 0
Using 6010 stars for magnitude calibration (before filtering).
Iteratively removing outliers from the linear mag-mag relation (unweighted fit)...
After removing outliers in (X,Y,dm) plane, we are left with 5181 stars for magnitude calibration.
Using the linear CCD position-dependent magnitude correction:
 delta_m = 0.00022*X_pix -0.00006*Y_pix +0.01419
ERROR in magnitude calibration: fabs(lin_mag_A * X_im_size + lin_mag_C) > MAX_LIN_CORR_MAG
ERROR in magnitude calibration: fabs(lin_mag_A * X_im_size + lin_mag_B * Y_im_size + lin_mag_C) > MAX_LIN_CORR_MAG
Used 5181 stars for magnitude calibration (after filtering).
get_detection_limit_sn(): Detection limit: -8.21
 ERROR!!! Magnitude calibration failure. Dropping image. 
    112369 objects stored in memory (1000000 max.)
memory:  280012 kB used, 301732 kB peak, 65263848 kB available RAM
processed 3 of 4 images ( 75.0%)



Processing  /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/fd_Lyn-01-Q2b1x1_2026-08-06_04-52-05_20.00sec_-0.00C_LIGHT_0436.fits
9576x6388 FITS image /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/fd_Lyn-01-Q2b1x1_2026-08-06_04-52-05_20.00sec_-0.00C_LIGHT_0436.fits
Trying to guess the time system by parsing the comment string 'Time of observation (UTC)'
Time system set from the comment to DATE-OBS keyword: 'Time of observation (UTC)'
The input time system is identified as: UTC (blank if unknown)
Setting observation date using DATE-OBS keyword: 2026-08-06T09:52:05.1792267
Setting observation time using DATE-OBS keyword: 2026-08-06T09:52:05.1792267

Observing time converted to the "standard" FITS header format:
DATE-OBS= 2026-08-06T09:52:05.179
EXPTIME = 20.000

Using the catalog image00004.cat SExtracted earlier from the image /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/fd_Lyn-01-Q2b1x1_2026-08-06_04-52-05_20.00sec_-0.00C_LIGHT_0436.fits
The star  8176.206   120.065 is rejected, see bad_region.lst
The star  8899.996   510.007 is rejected, see bad_region.lst
The star  9150.595   826.530 is rejected, see bad_region.lst
The star  9014.534  1023.483 is rejected, see bad_region.lst
The star  9287.997  1358.513 is rejected, see bad_region.lst
The star  1123.001  1551.002 is rejected, see bad_region.lst
The star  7649.352  1635.303 is rejected, see bad_region.lst
The star  9290.161  1687.989 is rejected, see bad_region.lst
The star  7713.289  1781.006 is rejected, see bad_region.lst
The star  8350.261  1782.976 is rejected, see bad_region.lst
Excluding more stars falling at bad regions!.. (will not print them all)
SExtractor output filtering results:
 * passed selection: 6701
 * rejected as having no flux measurement: 0
 * rejected as having SNR<3.0: 5
 * rejected inside rectangles defined in bad_region.lst: 243
 * rejected close to frame edge: 45
 * rejected as being too small (<1.2 pix): 0
 * rejected as being too large (>4.7 pix): 0
 * rejected as outliers in mag-size plot: 0
 * rejected as having SExtractor flags > 99 and <= 7: 0
 * rejected as having hopelessly bad SExtractor flags (>7): 26
 * rejected due to an external image flag: 0
 * rejected as having bad PSF fit: 0
---
You may change some of the filtering parameters by editing src/vast_limits.h and re-running 'make'.
     6701 * detected, using  100/ 500 * for reference/current image matching, fraction_of_ambiguous_matches= 0.000053, number_of_ambiguous_matches=6 
refining the coordinate transformation... [CVPOLY iter 1: order=3 pairs=6363 inliers=6363 rms 0.81 -> 0.25 pix, max corner correction 11.7 pix] fraction_of_ambiguous_matches= 0.000062, number_of_ambiguous_matches=7 
6362 * matched, [CVPOLY iter 2: order=1 pairs=6362 inliers=6362 rms 0.22 -> 0.22 pix, max corner correction 0.1 pix] fraction_of_ambiguous_matches= 0.000062, number_of_ambiguous_matches=7 
6362 * matched (2nd iteration). [CVPOLY iter 3: order=1 pairs=6362 inliers=6362 rms 0.22 -> 0.22 pix, max corner correction 0.0 pix] fraction_of_ambiguous_matches= 0.000044, number_of_ambiguous_matches=5 
6361 * matched (3rd iteration). Success!
  rotation [degrees] =  -3.586
     6701 stars detected,  6361 stars matched
Performing magnitude calibration using automatically selected comparison stars
Expecting to find at least 40 * for magnitude calibration
We have N_good_stars = 5004, N_manually_selected_comparison_stars = 0
Using 5004 stars for magnitude calibration (before filtering).
Iteratively removing outliers from the linear mag-mag relation (unweighted fit)...
After removing outliers in (X,Y,dm) plane, we are left with 4201 stars for magnitude calibration.
Using the linear CCD position-dependent magnitude correction:
 delta_m = 0.00024*X_pix -0.00002*Y_pix -0.09975
ERROR in magnitude calibration: fabs(lin_mag_A * X_im_size + lin_mag_C) > MAX_LIN_CORR_MAG
ERROR in magnitude calibration: fabs(lin_mag_A * X_im_size + lin_mag_B * Y_im_size + lin_mag_C) > MAX_LIN_CORR_MAG
Used 4201 stars for magnitude calibration (after filtering).
get_detection_limit_sn(): Detection limit: -8.21
 ERROR!!! Magnitude calibration failure. Dropping image. 
    112369 objects stored in memory (1000000 max.)
memory:  280012 kB used, 301732 kB peak, 65263848 kB available RAM
processed 4 of 4 images (100.0%)
TIMING matching_and_photometry: 1 seconds
Done with measurements! =)

Total number of measurements 165500 (165500 measurements stored in RAM)
Freeing up some memory...  Sorting the measurements cached in memory...
Writing lightcurve (outNNNNN.dat) files...
TIMING lightcurve_write: 2 seconds
The lightcurve files have been written, freeing up more memory...
Creating vast_image_details.log ... 

Writing summary file: vast_summary.log ...  OK
Selecting the best aperture for each source
Aperture with index 0 (REFERENCE_APERTURE_DIAMETER +0.00*REFERENCE_APERTURE_DIAMETER) seems best for  8882 stars
Aperture with index 1 (REFERENCE_APERTURE_DIAMETER +0.00*REFERENCE_APERTURE_DIAMETER) seems best for     0 stars
Aperture with index 2 (REFERENCE_APERTURE_DIAMETER -0.10*REFERENCE_APERTURE_DIAMETER) seems best for 14980 stars
Aperture with index 3 (REFERENCE_APERTURE_DIAMETER +0.10*REFERENCE_APERTURE_DIAMETER) seems best for  6524 stars
Aperture with index 4 (REFERENCE_APERTURE_DIAMETER +0.20*REFERENCE_APERTURE_DIAMETER) seems best for  9942 stars
Aperture with index 5 (REFERENCE_APERTURE_DIAMETER +0.30*REFERENCE_APERTURE_DIAMETER) seems best for 12803 stars

done!  =)
TIMING select_aperture: 2 seconds
Computing lightcurve statistics...  Will not compute variability indexes for objects having <1 points in lightcurve
You may disable this by commenting out the line '#define DROP_LIGHTCURVES_WITH_SMALL_NUMBER_OF_POINTS_FROM_ALL_PLOTS' in src/vast_limits.h an re-compiling VaST with 'make'

Computing, please wait a bit
................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
vast_lightcurve_statistics.log: 52878 objects, the longest string is 386 bytes.
Allocating memory for resorting the file.



----***** VaST processing WARNING *****----
You asked VaST to process 4 images, but only 1 were actually matched to the reference one.
Please investigate this!



**************************************************************
This error might be a bug, but it is far more likely that it is caused by 
inappropriate input data. A few simple things to check in the diagnostic
messages printed above (or the vast*.log files):
 * How many of the input images are matched?
 * Does the number of detected stars on each image look reasonable?
 * Do images have a sufficient overlap of at least about 20 percent?

You may run
 ./sextract_single_image /path/to/my/image/file.fit
to see how well VaST detects stars with the current SExtractor settings
(star detection settings can be changed in the default.sex configuration
file, see various examples in the VaST directory).

If you cannot identify the problem, please e-mail Kirill Sokolovsky 
Please try to describe the problem in details and, if possible, attach vast_summary.log
file and a few example images. If the images are too big to be sent by e-mail, please 
upload them through a web-form http://scan.sai.msu.ru/upload/
**************************************************************

Low percentage of matched images - we'll declare this an unsuccessful VaST run (exit code 1)
_____________________
SExtractor catalog cache: saved Lyn-01-Q2b1x1_2026-01-08_23-14-53_20.00sec_-15.00C_LIGHT_0201.fits.cat to cache
SExtractor catalog cache: saved Lyn-01-Q2b1x1_2026-02-11_00-13-56_20.00sec_-15.00C_LIGHT_0239.fits.cat to cache
VaST run complete with default.sex.telephoto_lens_vSTL
The four input images were /data_ssd/NMW-TexasTech/reference_imgs/Lyn-01-Q2b1x1_2026-01-08_23-14-53_20.00sec_-15.00C_LIGHT_0201.fits /data_ssd/NMW-TexasTech/reference_imgs/Lyn-01-Q2b1x1_2026-02-11_00-13-56_20.00sec_-15.00C_LIGHT_0239.fits /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/fd_Lyn-01-Q2b1x1_2026-08-06_04-51-27_20.00sec_-0.00C_LIGHT_0435.fits /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/fd_Lyn-01-Q2b1x1_2026-08-06_04-52-05_20.00sec_-0.00C_LIGHT_0436.fits
Last  image: 2461258.91085498 06.08.2026 09:51:27.870 UTC
ERROR running VaST on the field Lyn-01-Q2b1x1 (less than 4 images processed)
exp_start= 09.01.2026 05:14:53.596  exp=   20.000  JD= 2461049.71879162  ap=  4.5  rotation=   0.000  *detected= 94315  *matched= 94315  status=OK     /data_ssd/NMW-TexasTech/reference_imgs/Lyn-01-Q2b1x1_2026-01-08_23-14-53_20.00sec_-15.00C_LIGHT_0201.fits
exp_start= 11.02.2026 06:13:56.094  exp=   20.000  JD= 2461082.75979275  ap=  4.5  rotation= 170.774  *detected= 71185  *matched= 53131  status=OK     /data_ssd/NMW-TexasTech/reference_imgs/Lyn-01-Q2b1x1_2026-02-11_00-13-56_20.00sec_-15.00C_LIGHT_0239.fits
exp_start= 06.08.2026 09:51:27.870  exp=   20.000  JD= 2461258.91085498  ap=  4.8  rotation=  -3.585  *detected=  8128  *matched=  7604  status=ERROR  /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/fd_Lyn-01-Q2b1x1_2026-08-06_04-51-27_20.00sec_-0.00C_LIGHT_0435.fits
exp_start= 06.08.2026 09:52:05.179  exp=   20.000  JD= 2461258.91128679  ap=  4.7  rotation=  -3.586  *detected=  6701  *matched=  6361  status=ERROR  /data_ssd/NMW-TexasTech/workdir//img_2026-08-06_CI_Lyn-01-Q2b1x1_045339_TTUQ2b1x1_108974_qsh11011/fd_Lyn-01-Q2b1x1_2026-08-06_04-52-05_20.00sec_-0.00C_LIGHT_0436.fits
########### Completed Lyn-01-Q2b1x1 ###########
The analysis was running at tau
We are allowed to update the exclusion list at tau host
Found ../exclusion_list_TTUQ2.txt
#### The exclusion list before filtering-out asteroids, bad pixels and adding Gaia sources ####
###################################################################################
renamed 'exclusion_list_index_html.txt_noasteroids' -> 'exclusion_list_index_html.txt'
renamed 'exclusion_list_index_html.txt_nohotpixels' -> 'exclusion_list_index_html.txt'
# Count candidates with no identification (that also don't look like hot pix)
Found 0 unidentified candidates (excluding asteroids, hot pixels and known variable stars).
###################################################################################
0 candidates found (excluding asteroids and hot pixels)
This does not look like a test run
###################################################################################
exclusion_list_gaiadr2.txt NOT FOUND
exclusion_list_apass.txt NOT FOUND
IS_THIS_TEST_RUN=NO  ALLOW_EXCLUSION_LIST_UPDATE= YES
#### Nothing to add to the exclusion list ####
The observatory MPC code is V36
############################################################
ls: cannot access 'planets.txt': No such file or directory
############################################################
Positions of selected moons from JPL HORIZONS for JD(UT):
ls: cannot access 'moons.txt': No such file or directory
############################################################
Positions of selected spacecraft from JPL HORIZONS for JD(UT):
ls: cannot access 'spacecraft.txt': No such file or directory
############################################################
ls: cannot access 'comets.txt': No such file or directory
############################################################
List of recent ASAS-SN transients from https://www.astronomy.ohio-state.edu/asassn/transients.html :
ls: cannot access 'asassn_transients_list.txt': No such file or directory
############################################################
Truncated list of TOCP transients from http://www.cbat.eps.harvard.edu/unconf/tocp.html :
ls: cannot access 'tocp_transients_list.txt': No such file or directory

=== Transient Factory Profiling ===
Started: Thu Aug  6 04:57:58 CDT 2026
=======================================
TIMING SExtractor: 3 seconds
TIMING matching_and_photometry: 1 seconds
TIMING lightcurve_write: 0 seconds
TIMING select_aperture: 1 seconds
    VAST_RUN_default.sex.telephoto_lens_onlybrightstars_v1: 5s (0.08 min)
TIMING SExtractor: 6 seconds
TIMING matching_and_photometry: 1 seconds
TIMING lightcurve_write: 2 seconds
TIMING select_aperture: 2 seconds
    VAST_RUN_default.sex.telephoto_lens_vSTL: 14s (0.23 min)
FIELD_Lyn-01-Q2b1x1: 35s (0.58 min)
=======================================
TOTAL_RUNTIME: 36s (0.60 min)
Finished: Thu Aug  6 04:58:34 CDT 2026