srclist overlap message for exposure 2 of trigger 1351008
uvot_overlap.pl vrs. 2010-12-20b fem started at 250920d17h04m13s882711usUT
The observation of trigger 1351008 started 2025-09-20T08:52:18.1
Examining file ./1351008_g347_uvot_sky_srclist.fits
The exposure ID is 780051138
The exposure time is undefined.
The filter is U.
The uvot region is centered at (187.3161,47.8313) with a roll angle of 192.9
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 (187.3370,47.8440) with a radius of 3.000 arc min
This is 1.137 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 28.12 sq. arc min or 0.99 of the BAT error circle
The XRT error circle is centered at (187.3169,47.8375) with a radius of 0.032 arc min
This is 0.375 arc min from the center of the uvot region
The area of the XRT error circle is 0.003 sq. arc min
The UVOT/XRT overlap is 0.003 sq. arc min or 1.00 of the XRT error circle
srclist afterglow message for exposure 2 of trigger 1351008
find_uvot_ag.pl vrs. 2023-04-25a fem started at 250920d17h04m24s987745usUT
Observation start time is 2025-09-20T08:52:18.1
Examining file ./1351008_g347_uvot_catalog_srclist.fits
The exposure ID is 780051138
The exposure is 140.948 sec.
The bin size is 2 pixels
The filter is U
There are 8 detected source(s) for 1351008_g347
Aspect correction adds -0.00073 degrees (-0.175 sec of time = -1.77 arc sec) to RA
Aspect correction adds 0.00103 degrees ( 3.69 arcsec) to Dec
Total aspect correction is 4.09 arcsec
Star catalogs centered at 187.3223 , 47.8295 with radius 6.25 arc min.
n_usno: 366 n_gsc: 216
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 10.05
RA DEC Mag Color
bright star 0: 187.26389 (12:29:03.33) 47.79794 (+47:47:52.6) 10.05 USNO-B
Mean distance difference (CAT_DELTA) for 6 matched entries is 0.491" for 1351008_g347
Mean and std. dev of mag. difference (MAG_DELTA) are 1.263 and 1.658 for 1351008_g347
Found 3 entries without IDs and 2 entries that are acceptable afterglow candidates for 1351008_g347.
Acceptable entries have no ID, XRT distances < 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=187.3370 (12:29:20.88) DEC=47.8440 (+47:50:38.4)
XRT distances are from RA=187.3169 (12:29:16.05) DEC=47.8375 (+47:50:15.0)
*** WARNING 37 per cent of entries have no IDs.
-----------------
Entry 0 in the list of sources is a candidate afterglow for 1351008_g347 with 5x5 stamp
ra=187.31707 (12:29:16.10) dec=47.83733 (+47:50:14.4) +/- 1.1" mag=14.36+/-0.35
dist=0.8 REFID=2
src: 0 distr. of nearby unmatched sources: 0 0 0 0 0
Found 0 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)
##### This source remains a candidate #####
It has no entries within 4" or brighter than 13 mag
-----------------
Entry 2 in the list of sources is a candidate afterglow for 1351008_g347 with 5x5 stamp
ra=187.35330 (12:29:24.79) dec=47.81928 (+47:49:09.4) +/- 1.1" mag=20.37+/-0.35
dist=109.8 REFID=8
*** The position of this source is inconsistent with the XRT position.
The position is 97.3 arc sec from the BAT position.
src: 2 distr. of nearby unmatched sources: 0 0 0 0 0
Found 2 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
187.3477 47.8229 18.7 -1 USNO-B1 21.34 19.79 20.48
187.3582 47.8225 16.4 -1 GSC2.3 99.99 22.05 99.99
*** If XRT position is correct, then this is NOT the afterglow
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=187.31707 (12:29:16.10) dec=47.83733 (+47:50:14.4) +/- 1.1" mag=14.36+/-0.35 dist=0.8 REFID=2
Good candidates have no ID, acceptable profiles,
mag between 9.01 and 17.81, XRT distances < 5",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 1 good candidate(s) found.
srclist paragraph message for exposure 2 of trigger 1351008
------ Start for Possible Stand-alone Circular ----
In response to GRB250920 (Swift/BAT trigger 1351008) at 08:46:30 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 141 seconds with the U filter starting
311 seconds after the BAT trigger. There is a candidate afterglow in the
rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 12:29:16.08 = 187.31701
DEC(J2000) = +47:50:14.5 = 47.83737
with a 90%-confidence error radius of about 0.74 arc sec. This position is 0.6
arc sec. from the center of the XRT error circle. The estimated magnitude is
13.32 with a 1-sigma error of about 0.14. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.011.
------- notes for trigger 1351008 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 250920d17h04m28s287951usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1351008
-expid=780051138 -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/1351008/
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 780051138.0665 or about 2025:264:08:52:13 UT
Found 362 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 6% of the srclist region. Found 8 sources in
srclist catalog. Found 3 srclist source(s) without IDs. There are 1 good
candidate(s) in the srclist catalog. Good candidates must be brighter than
17.81 mag.
Found 2 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
19.57 mag. Found 53 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 8% of the Genie image region.
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?
780051138 311 U 187.31707 47.83733 14.36/17.8 0.8 srclist Yes
780051138 311 U 187.31701 47.83737 13.32/19.6 0.6 image Yes
List afterglow candidates for other finding charts.
780050925 98 WHITE 187.31690 47.83727 13.86/19.2 0.8 srclist Yes
780050925 98 WHITE 187.31697 47.83734 13.75/20.1 0.6 image Yes
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: 47.83737
GRB_ERROR: 0.74
GRB_RA: 187.31701
IMAGE_START_TIME: 08:52:13
MAGNITUDE: 13.32
MAG_ERROR: 0.14
MESSAGE_TYPE: ACK
SOURCE: XRT