srclist overlap message for exposure 2 of trigger 1401726
uvot_overlap.pl vrs. 2010-12-20b fem started at 251005d20h01m51s648068usUT
The observation of trigger 1401726 started 2025-10-05T16:13:06.3
Examining file ./1401726_g372_uvot_sky_srclist.fits
The exposure ID is 781373586
The exposure time is undefined.
The filter is U.
The uvot region is centered at (75.6804,16.8818) with a roll angle of 87.3
It is square with sides of 12.05 arc min. for an area of 145.15 sq arc min
The BAT error circle is centered at (75.6730,16.8820) with a radius of 3.000 arc min
This is 0.427 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 (75.6833,16.8801) with a radius of 0.035 arc min
This is 0.195 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 2 of trigger 1401726
find_uvot_ag.pl vrs. 2023-04-25a fem started at 251005d20h02m04s813933usUT
Observation start time is 2025-10-05T16:13:06.3
Examining file ./1401726_g372_uvot_catalog_srclist.fits
The exposure ID is 781373586
The exposure is 249.935 sec.
The bin size is 2 pixels
The filter is U
There are 90 detected source(s) for 1401726_g372
Aspect correction adds 0.00093 degrees (0.222 sec of time = 3.19 arc sec) to RA
Aspect correction adds -0.00070 degrees (-2.52 arcsec) to Dec
Total aspect correction is 4.07 arcsec
Star catalogs centered at 75.6819 , 16.8863 with radius 8.77 arc min.
n_usno: 931 n_gsc: 1063
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 83 matched entries is 0.855" for 1401726_g372
Mean and std. dev of mag. difference (MAG_DELTA) are 1.625 and 0.604 for 1401726_g372
Found 8 entries without IDs and 1 entries that are acceptable afterglow candidates for 1401726_g372.
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.
Magnitude criteria will be applied later.
BAT distances are from RA=75.6730 (05:02:41.52) DEC=16.8820 (+16:52:55.2)
XRT distances are from RA=75.6833 (05:02:44.00) DEC=16.8801 (+16:52:48.3)
-----------------
Entry 16 in the list of sources is a candidate afterglow for 1401726_g372 with 3x3 stamp
ra=75.71766 (05:02:52.24) dec=16.84913 (+16:50:56.9) +/- 1.1" mag=18.60+/-0.35
dist=162.5 REFID=69
*** The position of this source is inconsistent with the XRT position.
The position is 194.1 arc sec from the BAT position.
src: 16 distr. of nearby unmatched sources: 0 0 0 0 0
Found 5 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
75.7174 16.8501 3.4 -1 USNO-B1 99.99 17.24 99.99 *
75.7182 16.8500 3.6 -1 USNO-B1 15.42 14.11 14.69 *
75.7219 16.8500 14.9 -1 USNO-B1 99.99 19.32 99.99
75.7184 16.8499 3.7 -1 GSC2.3 13.83 15.22 14.28 *
75.7221 16.8499 15.5 -1 GSC2.3 19.64 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 0 entries in star catalog(s) within 10" of the XRT position.
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 18.12, 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 2 of trigger 1401726
------ Start for Possible Stand-alone Circular ----
In response to GRB251005 (Swift/BAT trigger 1401726) at 16:06:53 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
335 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 19.2 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 18.0 mag. No
correction has been made for the expected extinction corresponding to E(B-V) of
0.461.
------- notes for trigger 1401726 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 251005d20h02m07s503771usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1401726
-expid=781373586 -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/1401726/
Links to data for all triggers can be found at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/
XRT position found for srclist. XRT position found for Genie image. BAT
position found.
UVOT exposure began at MET 781373586.3163 or about 2025:279:16:13:01 UT
Found 1041 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 9% of the srclist region. Found 90 sources in
srclist catalog. Found 8 srclist source(s) without IDs. There are 0 good
candidate(s) in the srclist catalog. Good candidates must be brighter than
18.12 mag.
Found 11 source(s) in Genie image catalog. Found 7 Genie image source(s)
without IDs. There are 0 good candidate(s) in the Genie image catalog. Good
candidates must be brighter than 20.06 mag. Found 100 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
10% of the Genie image region.
Genie image analysis:
Found 36617.1 counts in the large background region of 6199.0 pixels or a rate
of 5.907 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 19.29 mag. for a
4-arcsec aperture.
Found 688.1 counts in the XRT position region of 199.0 pixels or a rate of
3.458 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is -1.230 +/- 0.116 (1-sigma) cps. The
3-sigma UL at the XRT position is 0.349 cps or 19.27 mag. The closest srclist
source has ra= 75.6825 dec= 16.9022 mag=15.90 sep=79.54". The closest Genie
source has ra= 75.6695 dec= 16.8780 mag=18.35 sep=48.31".
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?
781373586 335 U srclist found no candidates.
781373586 335 U image found no candidates.
List afterglow candidates for other finding charts.
781373373 122 WHITE srclist found no candidates.
781373373 122 WHITE image found no candidates.
781374116 865 WHITE srclist found no candidates.
781374116 865 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: 16.88008
GRB_ERROR: 5.25
GRB_RA: 75.68333
IMAGE_START_TIME: 16:13:01
MAGNITUDE: 19.3
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT