srclist overlap message for exposure 1 of trigger 1426088
uvot_overlap.pl vrs. 2010-12-20b fem started at 251221d20h39m30s289976usUT
The observation of trigger 1426088 started 2025-12-21T05:27:31.6
Examining file ./1426088_g179_uvot_sky_srclist.fits
The exposure ID is 787987651
The exposure time is undefined.
The filter is WHITE.
The uvot region is centered at (101.4114,0.7229) with a roll angle of 154.0
It is square with sides of 8.03 arc min. for an area of 64.51 sq arc min
The BAT error circle is centered at (101.4080,0.7290) with a radius of 3.000 arc min
This is 0.419 arc min from the center of the uvot region
The area of the BAT error circle is 28.27 sq. arc min
The UVOT/BAT overlap is 28.27 sq. arc min or 1.00 of the BAT error circle
The XRT error circle is centered at (101.4277,0.7322) with a radius of 0.035 arc min
This is 1.122 arc min from the center of the uvot region
The area of the XRT error circle is 0.004 sq. arc min
The UVOT/XRT overlap is 0.004 sq. arc min or 1.00 of the XRT error circle
srclist afterglow message for exposure 1 of trigger 1426088
find_uvot_ag.pl vrs. 2023-04-25a fem started at 251221d20h39m34s248179usUT
Observation start time is 2025-12-21T05:27:31.6
Examining file ./1426088_g179_uvot_catalog_srclist.fits
The exposure ID is 787987651
The exposure is 149.868 sec.
The bin size is 2 pixels
The filter is WHITE
There are 190 detected source(s) for 1426088_g179
*** WARNING -- the sources have filled the available telemetry buffer (190).
srclist_overlap returned: bat_overlap 1.000
srclist_overlap returned: xrt_overlap 1.000
Dimmest detected source in 1426088_g179 has mag 19.28
Aspect correction adds 0.00025 degrees (0.061 sec of time = 0.91 arc sec) to RA
Aspect correction adds -0.00187 degrees (-6.72 arcsec) to Dec
Total aspect correction is 6.78 arcsec
Star catalogs centered at 101.4120 , 0.7228 with radius 6.35 arc min.
n_usno: 1196 n_gsc: 1484
*** WARNING -- bright star catalog has 10 entries brighter than 12 mag
The brightest has mag 11.0175
RA DEC Mag Color
bright star 0: 101.40835 (06:45:38.00) 0.66847 (+00:40:06.5) 11.41 USNO-V
bright star 1: 101.48407 (06:45:56.18) 0.76553 (+00:45:55.9) 11.32 USNO-V
bright star 2: 101.47713 (06:45:54.51) 0.66878 (+00:40:07.6) 11.96 USNO-V
bright star 3: 101.49556 (06:45:58.94) 0.74462 (+00:44:40.7) 11.99 USNO-V
bright star 4: 101.37924 (06:45:31.02) 0.80683 (+00:48:24.6) 11.55 USNO-V
bright star 5: 101.32797 (06:45:18.71) 0.78588 (+00:47:09.2) 11.59 USNO-V
bright star 6: 101.36219 (06:45:26.93) 0.68108 (+00:40:51.9) 11.02 GSC-F
bright star 7: 101.41760 (06:45:40.22) 0.65687 (+00:39:24.7) 11.65 GSC-F
bright star 8: 101.39742 (06:45:35.38) 0.79799 (+00:47:52.7) 11.34 GSC-F
bright star 9: 101.34320 (06:45:22.37) 0.64684 (+00:38:48.6) 11.71 GSC-F
Mean distance difference (CAT_DELTA) for 187 matched entries is 0.736" for 1426088_g179
Mean and std. dev of mag. difference (MAG_DELTA) are 1.171 and 0.627 for 1426088_g179
Found 7 entries without IDs and 3 entries that are acceptable afterglow candidates for 1426088_g179.
Acceptable entries have no ID, XRT distances < 5.25", and are > 0.8*(80 - 10*(mag-6))" from any bright star
from any bright star and >21.6" from other rejected sources.
0 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=101.4080 (06:45:37.92) DEC= 0.7290 (+00:43:44.4)
XRT distances are from RA=101.4277 (06:45:42.65) DEC= 0.7322 (+00:43:55.8)
-----------------
Entry 43 in the list of sources is a candidate afterglow for 1426088_g179 with 1x1 stamp
ra=101.44086 (06:45:45.81) dec=0.74389 (+00:44:38.0) +/- 1.1" mag=18.79+/-0.35
dist=63.4 REFID=149
*** The position of this source is inconsistent with the XRT position.
The position is 129.9 arc sec from the BAT position.
src: 43 srclist_match has ID
src: 43 distr. of nearby unmatched sources: 0 0 0 0 0
Found 4 entries in star catalog(s) within 20.0" of the candidate.
printing all entries
(Entries within 2 arc sec of a source list entry are considered a match)
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
101.4394 0.7429 6.3 -1 USNO-B1 14.23 13.18 13.65
101.4391 0.7426 7.8 -1 GSC2.3 13.51 14.37 99.99
101.4407 0.7437 0.9 -1 GSC2.3 15.04 17.55 99.99 *
101.4395 0.7485 17.5 -1 GSC2.3 19.86 99.99 99.99
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 4" or brighter than 13 mag
-----------------
Entry 53 in the list of sources is a candidate afterglow for 1426088_g179 with 3x3 stamp
ra=101.39884 (06:45:35.72) dec=0.68799 (+00:41:16.8) +/- 1.1" mag=17.32+/-0.35
dist=190.0 REFID=74
*** The position of this source is inconsistent with the XRT position.
The position is 151.3 arc sec from the BAT position.
src: 53 distr. of nearby unmatched sources: 0 0 0 0 0
Found 9 entries in star catalog(s) within 20.0" of the candidate.
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
101.4006 0.6915 14.1 -1 USNO-B1 19.66 17.77 18.60
101.3990 0.6873 2.4 -1 USNO-B1 15.20 14.32 14.71 *
101.4028 0.6842 19.8 -1 USNO-B1 18.68 16.99 17.74
101.3943 0.6872 16.7 -1 USNO-B1 19.75 18.81 19.23
101.4006 0.6914 14.0 -1 GSC2.3 17.70 19.63 99.99
101.3990 0.6874 2.4 -1 GSC2.3 13.94 14.99 99.99 *
101.3992 0.6867 5.0 -1 GSC2.3 99.99 99.99 99.99
101.4028 0.6843 19.6 -1 GSC2.3 17.06 18.75 99.99
101.3942 0.6872 16.9 -1 GSC2.3 18.79 20.29 99.99
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 4" or brighter than 13 mag
-----------------
Entry 61 in the list of sources is a candidate afterglow for 1426088_g179 with 1x1 stamp
ra=101.38310 (06:45:31.94) dec=0.76808 (+00:46:05.1) +/- 1.1" mag=18.98+/-0.35
dist=206.2 REFID=158
*** The position of this source is inconsistent with the XRT position.
The position is 166.8 arc sec from the BAT position.
src: 61 srclist_match has ID
src: 61 distr. of nearby unmatched sources: 0 0 0 0 0
Found 13 entries in star catalog(s) within 20.0" of the candidate.
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
101.3823 0.7631 18.1 -1 USNO-B1 18.89 17.33 18.02
101.3861 0.7662 12.6 -1 USNO-B1 15.52 14.28 14.83
101.3861 0.7699 12.8 -1 USNO-B1 20.32 19.60 19.92
101.3823 0.7677 3.3 -1 USNO-B1 16.26 15.22 15.68 *
101.3793 0.7705 16.2 -1 USNO-B1 99.99 18.70 99.99
101.3786 0.7701 17.7 -1 USNO-B1 19.98 18.27 19.02
101.3823 0.7631 18.2 -1 GSC2.3 17.36 18.87 99.99
101.3861 0.7663 12.4 -1 GSC2.3 14.24 15.36 99.99
101.3831 0.7682 0.5 -1 GSC2.3 99.99 99.99 99.99 *
101.3822 0.7678 3.4 -1 GSC2.3 14.85 16.19 99.99 *
101.3858 0.7701 12.2 -1 GSC2.3 19.93 21.91 99.99
101.3785 0.7701 18.2 -1 GSC2.3 18.46 20.07 99.99
101.3796 0.7710 16.4 -1 GSC2.3 19.96 99.99 99.99
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 4" or brighter than 13 mag
Found 3 entries in star catalog(s) within 10" of the XRT position.
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
101.4305 0.7322 10.0 -1 USNO-B1 20.62 19.41 19.95
101.4263 0.7321 5.0 -1 GSC2.3 20.33 99.99 99.99
101.4303 0.7323 9.4 -1 GSC2.3 19.23 21.11 99.99
The closest star is 4.97" away.
List UVOT sources within 10" of the XRT position:
There are no candidates inside BAT error circle, but outside XRT error circle.
Good candidates have no ID, acceptable profiles,
mag between 9.01 and 19.22, XRT distances < 5.25",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
srclist paragraph message for exposure 1 of trigger 1426088
SRCLIST PROBLEM: srclist filled telemetry buffer
WARNING -- because of the LARGE EXTINCTION, results should be used cautiously.
------ Start for Possible Stand-alone Circular ----
In response to GRB251221 (Swift/BAT trigger 1426088) at 05:24:31 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 142 seconds after the BAT trigger. No credible afterglow candidate has
been found in the initial data products. The 2.7'x2.7' sub-image covers 100% of
the XRT error circle. The typical 3-sigma upper limit has been about 19.6 mag.
The 8'x8' region for the list of sources generated on-board covers 100% of the
XRT error circle. The list of sources is typically complete to about 18 mag. No
correction has been made for the large, but uncertain, extinction expected.
------- notes for trigger 1426088 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 251221d20h39m38s090646usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1426088
-expid=787987651 -meonly -msg_srclist
Results from standard processing of UVOT TDRSS data for this trigger should be
available at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/1426088/
Links to data for all triggers can be found at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/
Unreliable extinction found for xrt position. XRT position found for srclist.
XRT position found for Genie image. BAT position found.
UVOT exposure began at MET 787987651.60374 or about 2025:356:05:27:26 UT
Found 1452 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 25% of the srclist region. Found 190 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 7 srclist
source(s) without IDs. There are 0 good candidate(s) in the srclist catalog.
Good candidates must be brighter than 19.22 mag.
Found 36 source(s) in Genie image catalog. Found 0 Genie image source(s)
without IDs. There are 0 good candidate(s) in the Genie image catalog. Good
candidates must be brighter than 20.56 mag. Found 245 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
22% of the Genie image region.
Genie image analysis:
Found 63199.5 counts in the large background region of 5332.0 pixels or a rate
of 11.853 counts/pixel in a radius of 45.0 arcsec. Based on this background,
the typical 5-sigma UL at a random point in the Genie image is 19.83 mag. for a
4-arcsec aperture.
Found 2367.5 counts in the XRT position region of 200.0 pixels or a rate of
11.838 counts/pixel in a radius of 8.0 arcsec. The net count rate (using large
background region) at the XRT position is -0.020 +/- 0.330 (1-sigma) cps. The
3-sigma UL at the XRT position is 0.991 cps or 19.61 mag. The number of srclist
sources filled the available telemetry. The weakest source detected was 19.28
mag. The closest srclist source has ra= 101.4327 dec= 0.7369 mag=19.21
sep=24.98". The closest Genie source has ra= 101.4326 dec= 0.7371 mag=18.77
sep=25.05".
All AG candidates sorted by magnitude for the current finding chart.
(U/V/White SRCLIST mags < 17.5/17.5/18.5 are reliable. Mag > 18.5/18.5/19.5 are
not. Others are uncertain.)
(U/V/White Genie image mags < 18.0/18.0/19.0 are reliable. Mag > 19.0/19.0/20.0
are not. Others are uncertain.)
(Magnitudes followed by * have been corrected for exposure.)
---MET--- -dt- filter ---RA-- ---DEC--- -MAG/Limit Dist(") Source Asp.Corr?
787987651 142 WHITE srclist found no candidates.
787987651 142 WHITE image found no candidates.
List afterglow candidates for other finding charts.
787987809 300 U srclist found no candidates.
787987809 300 U image found no candidates.
787988386 877 WHITE srclist found no candidates.
787988386 877 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: 0.73217
GRB_ERROR: 5.25
GRB_RA: 101.42771
IMAGE_START_TIME: 05:27:26
MAGNITUDE: 19.6
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT