srclist overlap message for exposure 2 of trigger 1351790
uvot_overlap.pl vrs. 2010-12-20b fem started at 250924d21h36m41s223985usUT
The observation of trigger 1351790 started 2025-09-24T08:24:56.5
Examining file ./1351790_g386_uvot_sky_srclist.fits
The exposure ID is 780395096
The exposure time is undefined.
The filter is U.
The uvot region is centered at (51.8827,74.6631) with a roll angle of 51.6
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 (51.8650,74.6520) with a radius of 3.000 arc min
This is 0.725 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 (51.8724,74.6585) with a radius of 0.037 arc min
This is 0.325 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 1351790
find_uvot_ag.pl vrs. 2023-04-25a fem started at 250924d21h36m55s861906usUT
Observation start time is 2025-09-24T08:24:56.5
Examining file ./1351790_g386_uvot_catalog_srclist.fits
The exposure ID is 780395096
The exposure is 249.935 sec.
The bin size is 2 pixels
The filter is U
There are 66 detected source(s) for 1351790_g386
Aspect correction adds 0.00471 degrees (1.130 sec of time = 4.48 arc sec) to RA
Aspect correction adds 0.00034 degrees ( 1.22 arcsec) to Dec
Total aspect correction is 4.65 arcsec
Star catalogs centered at 51.9084 , 74.6600 with radius 6.20 arc min.
n_usno: 560 n_gsc: 605
*** WARNING -- bright star catalog has 2 entries brighter than 12 mag
The brightest has mag 11.623
RA DEC Mag Color
bright star 0: 51.84171 (03:27:22.01) 74.62269 (+74:37:21.7) 11.83 GSC-V
bright star 1: 52.02092 (03:28:05.02) 74.71181 (+74:42:42.5) 11.62 GSC-V
Mean distance difference (CAT_DELTA) for 62 matched entries is 0.762" for 1351790_g386
Mean and std. dev of mag. difference (MAG_DELTA) are 1.649 and 0.620 for 1351790_g386
Found 5 entries without IDs and 4 entries that are acceptable afterglow candidates for 1351790_g386.
Acceptable entries have no ID, XRT distances < 5.5", 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=51.8650 (03:27:27.60) DEC=74.6520 (+74:39:07.2)
XRT distances are from RA=51.8724 (03:27:29.37) DEC=74.6585 (+74:39:30.5)
-----------------
Entry 0 in the list of sources is a candidate afterglow for 1351790_g386 with 3x3 stamp
ra=51.87258 (03:27:29.42) dec=74.65915 (+74:39:32.9) +/- 1.1" mag=18.79+/-0.35
dist=2.4 REFID=52
src: 0 distr. of nearby unmatched sources: 0 0 0 0 1
Found 2 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
51.8840 74.6637 19.7 -1 USNO-B1 18.83 16.93 17.77
51.8843 74.6636 19.6 -1 GSC2.3 17.12 18.75 17.64
##### This source remains a candidate #####
It has no entries within 4" or brighter than 13 mag
-----------------
Entry 13 in the list of sources is a candidate afterglow for 1351790_g386 with 3x3 stamp
ra=51.95645 (03:27:49.55) dec=74.66282 (+74:39:46.2) +/- 1.1" mag=19.43+/-0.35
dist=81.6 REFID=61
*** The position of this source is inconsistent with the XRT position.
The position is 95.4 arc sec from the BAT position.
src: 13 distr. of nearby unmatched sources: 1 0 0 0 1
Found 3 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
51.9422 74.6648 15.3 -1 USNO-B1 16.77 15.64 16.14
51.9540 74.6646 6.9 -1 USNO-B1 12.27 11.84 12.03 *
51.9540 74.6646 6.9 -1 GSC2.3 99.99 99.99 12.05 *
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 4" or brighter than 13 mag
-----------------
Entry 14 in the list of sources is a candidate afterglow for 1351790_g386 with 3x3 stamp
ra=51.95620 (03:27:49.49) dec=74.66335 (+74:39:48.1) +/- 1.1" mag=19.23+/-0.35
dist=81.7 REFID=60
*** The position of this source is inconsistent with the XRT position.
The position is 96.0 arc sec from the BAT position.
src: 14 distr. of nearby unmatched sources: 1 0 0 0 1
Found 5 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
51.9422 74.6648 14.3 -1 USNO-B1 16.77 15.64 16.14
51.9540 74.6646 5.1 -1 USNO-B1 12.27 11.84 12.03 *
51.9682 74.6676 19.2 -1 USNO-B1 16.21 14.76 15.40
51.9540 74.6646 5.1 -1 GSC2.3 99.99 99.99 12.05 *
51.9685 74.6676 19.2 -1 GSC2.3 14.66 15.76 15.04
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 4" or brighter than 13 mag
-----------------
Entry 43 in the list of sources is a candidate afterglow for 1351790_g386 with 3x3 stamp
ra=51.72251 (03:26:53.40) dec=74.62121 (+74:37:16.4) +/- 1.1" mag=18.96+/-0.35
dist=196.1 REFID=48
*** The position of this source is inconsistent with the XRT position.
The position is 175.4 arc sec from the BAT position.
src: 43 srclist_match has ID
src: 43 distr. of nearby unmatched sources: 1 0 0 0 1
Found 6 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
51.7225 74.6228 5.8 -1 USNO-B1 16.91 14.73 15.70
51.7233 74.6219 2.5 -1 USNO-B1 17.30 16.10 16.63 *
51.7229 74.6183 10.6 -1 USNO-B1 99.99 18.87 99.99
51.7225 74.6230 6.6 -1 GSC2.3 15.48 17.08 15.18
51.7239 74.6214 1.6 -1 GSC2.3 16.94 18.24 99.99 *
51.7241 74.6178 12.3 -1 GSC2.3 19.82 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:
Unmatched source ra=51.87258 (03:27:29.42) dec=74.65915 (+74:39:32.9) +/- 1.1" mag=18.79+/-0.35 dist=2.4 REFID=52
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 < 5.5",
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 1351790
------ Start for Possible Stand-alone Circular ----
In response to GRB250924 (Swift/BAT trigger 1351790) at 08:18:29 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
350 seconds after the BAT trigger. There is a candidate afterglow in the
rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 03:27:29.64 = 51.87351
DEC(J2000) = +74:39:33.9 = 74.65943
with a 90%-confidence error radius of about 0.64 arc sec. This position is 3.6
arc sec. from the center of the XRT error circle. The estimated magnitude is
18.03 with a 1-sigma error of about 0.15. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.316.
------- notes for trigger 1351790 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 250924d21h36m58s466051usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1351790
-expid=780395096 -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/1351790/
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 780395096.52266 or about 2025:268:08:24:51 UT
Found 591 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 10% of the srclist region. Found 66 sources in
srclist catalog. Found 5 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 19 source(s) in Genie image catalog. 1 source(s) are within 10.0" of the
xrt position. Found 1 Genie image source(s) without IDs. There are 1 good
candidate(s) in the Genie image catalog. Good candidates must be brighter than
20.63 mag. Found 134 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 12% of the Genie image region.
Found 1 srclist source(s) within 10.0" of the XRT position.
The brightest such source has ra= 51.8726 dec= 74.6591 mag=18.79 sep=2.44".
The closest srclist source has ra= 51.8726 dec= 74.6591 mag=18.79 sep=2.44".
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?
780395096 350 U 51.87258 74.65915 18.79/18.1 2.4 srclist Yes
780395096 350 U 51.87351 74.65943 18.03/20.6 3.6 image Yes
List afterglow candidates for other finding charts.
780394938 192 WHITE 51.87355 74.65937 18.33/19.2 3.4 srclist Yes
780394938 192 WHITE 51.87340 74.65945 17.74/20.9 3.7 image Yes
780395604 858 WHITE srclist found no candidates.
780395604 858 WHITE 51.87320 74.65940 19.44/20.4 1.3 image Yes
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: 74.65943
GRB_ERROR: 0.64
GRB_RA: 51.87351
IMAGE_START_TIME: 08:24:51
MAGNITUDE: 18.03
MAG_ERROR: 0.15
MESSAGE_TYPE: ACK
SOURCE: XRT