srclist overlap message for exposure 2 of trigger 1404904
uvot_overlap.pl vrs. 2010-12-20b fem started at 251017d12h56m41s529700usUT
The observation of trigger 1404904 started 2025-10-17T08:46:53.3
Examining file ./1404904_g368_uvot_sky_srclist.fits
The exposure ID is 782383613
The exposure time is undefined.
The filter is U.
The uvot region is centered at (335.3944,7.0379) with a roll angle of 263.7
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 (335.3860,7.0510) with a radius of 3.000 arc min
This is 0.934 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 (335.4013,7.0401) with a radius of 0.035 arc min
This is 0.432 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 1404904
find_uvot_ag.pl vrs. 2023-04-25a fem started at 251017d12h56m58s370576usUT
Observation start time is 2025-10-17T08:46:53.3
Examining file ./1404904_g368_uvot_catalog_srclist.fits
The exposure ID is 782383613
The exposure is 249.935 sec.
The bin size is 2 pixels
The filter is U
There are 40 detected source(s) for 1404904_g368
Aspect correction adds -0.00006 degrees (-0.014 sec of time = -0.20 arc sec) to RA
Aspect correction adds -0.00009 degrees (-0.32 arcsec) to Dec
Total aspect correction is 0.38 arcsec
Star catalogs centered at 335.3854 , 7.0325 with radius 6.05 arc min.
n_usno: 346 n_gsc: 364
*** WARNING -- bright star catalog has 3 entries brighter than 12 mag
The brightest has mag 9.81514
RA DEC Mag Color
bright star 0: 335.36962 (22:21:28.71) 7.03010 (+07:01:48.4) 9.82 USNO-V
bright star 1: 335.33063 (22:21:19.35) 7.06203 (+07:03:43.3) 11.69 GSC-F
bright star 2: 335.43112 (22:21:43.47) 6.96351 (+06:57:48.6) 10.13 GSC-V
Mean distance difference (CAT_DELTA) for 26 matched entries is 0.541" for 1404904_g368
Mean and std. dev of mag. difference (MAG_DELTA) are 1.745 and 0.749 for 1404904_g368
Found 14 entries without IDs and 1 entries that are acceptable afterglow candidates for 1404904_g368.
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.
13 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=335.3860 (22:21:32.64) DEC= 7.0510 (+07:03:03.6)
XRT distances are from RA=335.4013 (22:21:36.32) DEC= 7.0401 (+07:02:24.3)
*** WARNING 35 per cent of entries have no IDs.
-----------------
Entry 18 in the list of sources is a candidate afterglow for 1404904_g368 with 5x5 stamp
ra=335.36718 (22:21:28.12) dec=7.08325 (+07:04:59.7) +/- 1.1" mag=20.08+/-0.35
dist=197.6 REFID=40
*** The position of this source is inconsistent with the XRT position.
The position is 134.2 arc sec from the BAT position.
src: 18 distr. of nearby unmatched sources: 0 0 0 0 0
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
335.3667 7.0819 5.1 -1 USNO-B1 14.01 12.30 13.06 *
335.3667 7.0819 5.3 -1 GSC2.3 12.49 14.18 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
335.4016 7.0374 9.7 -1 USNO-B1 18.98 17.80 18.32
335.4040 7.0395 9.9 -1 USNO-B1 18.76 17.27 17.93
335.4041 7.0395 10.0 -1 GSC2.3 17.35 18.97 18.40
The closest star is 9.71" 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 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 1404904
1 source(s) near the XRT position were rejected as afterglow candidate(s). See
notes for details.
------ Start for Possible Stand-alone Circular ----
In response to GRB251017 (Swift/BAT trigger 1404904) at 08:40:44 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
332 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
0.108.
------- notes for trigger 1404904 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 251017d12h57m00s984620usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1404904
-expid=782383613 -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/1404904/
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 782383613.2654 or about 2025:291:08:46:48 UT
Found 364 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 6% of the srclist region. Found 40 sources in
srclist catalog. Found 14 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 8 source(s) in Genie image catalog. 1 source(s) are within 10.0" of the
xrt position. 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
20.58 mag. Found 66 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 6% of the Genie image region.
Genie image analysis:
Found 13090.3 counts in the large background region of 5857.0 pixels or a rate
of 2.235 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 19.82 mag. for a
4-arcsec aperture.
Found 470.6 counts in the XRT position region of 208.0 pixels or a rate of
2.263 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 0.077 +/- 0.094 (1-sigma) cps or
20.92 mag and a range from 20.05 to 99.99 mag. The 3-sigma UL at the XRT
position is 0.359 cps or 19.24 mag. The closest srclist source has ra= 335.3883
dec= 7.0453 mag=17.59 sep=50.20".
Found 1 Genie source(s) within 10.0" of the XRT position. The brightest such
source has ra= 335.4040 dec= 7.0395 mag=18.91 sep=9.76". The closest Genie
source has ra= 335.4040 dec= 7.0395 mag=18.91 sep=9.76".
Report rejected UVOT sources within 10 arcsec XRT position.
Such sources are usually NOT the afterglow.
****THIS SOURCE NEAR XRT POSITION WAS REJECTED--USE WITH CAUTION****
UVOT took a finding chart exposure of 250 seconds with the U filter starting
332 seconds after the BAT trigger. There is a candidate afterglow in the
rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 22:21:36.96 = 335.40399
DEC(J2000) = +07:02:22.1 = 7.03947
with a 90%-confidence error radius of about 0.69 arc sec. This position is 9.76
arc sec. from the center of the XRT error circle. The estimated magnitude is
18.91 with a 1-sigma error of about 0.17. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.108.
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?
782383613 331 U srclist found no candidates.
782383613 331 U image found no candidates.
List afterglow candidates for other finding charts.
782383401 119 WHITE 335.40091 7.03989 19.93/19.2 1.7 srclist Yes
782383401 119 WHITE 335.40098 7.03990 20.42/20.7 1.4 image Yes
782384142 860 WHITE srclist found no candidates.
782384142 860 WHITE 335.40099 7.04003 21.48/20.8 1.7 image Yes
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: 7.04008
GRB_ERROR: 5.25
GRB_RA: 335.40133
IMAGE_START_TIME: 08:46:48
MAGNITUDE: 19.2
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT