srclist overlap message for exposure 1 of trigger 1308754
uvot_overlap.pl vrs. 2010-12-20b fem started at 250502d11h59m31s156956usUT
The observation of trigger 1308754 started 2025-04-30T17:34:17.3
Examining file ./1308754_g196_uvot_sky_srclist.fits
The exposure ID is 767727257
The exposure time is undefined.
The filter is WHITE.
The uvot region is centered at (233.4361,-18.0835) with a roll angle of 99.6
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 (233.4280,-18.0830) with a radius of 3.000 arc min
This is 0.461 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 (233.3870,-18.1185) with a radius of 0.038 arc min
This is 3.498 arc min from the center of the uvot region
The area of the XRT error circle is 0.005 sq. arc min
The UVOT/XRT overlap is 0.005 sq. arc min or 1.00 of the XRT error circle
srclist afterglow message for exposure 1 of trigger 1308754
find_uvot_ag.pl vrs. 2023-04-25a fem started at 250502d11h59m34s293986usUT
Observation start time is 2025-04-30T17:34:17.3
Examining file ./1308754_g196_uvot_catalog_srclist.fits
The exposure ID is 767727257
The exposure is 149.868 sec.
The bin size is 2 pixels
The filter is WHITE
There are 76 detected source(s) for 1308754_g196
Aspect correction adds 0.00109 degrees (0.261 sec of time = 3.73 arc sec) to RA
Aspect correction adds -0.00060 degrees (-2.17 arcsec) to Dec
Total aspect correction is 4.31 arcsec
Star catalogs centered at 233.4355 , -18.0830 with radius 6.18 arc min.
n_usno: 809 n_gsc: 597
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 86 matched entries is 0.773" for 1308754_g196
Mean and std. dev of mag. difference (MAG_DELTA) are 0.725 and 0.810 for 1308754_g196
Found 4 entries without IDs and 3 entries that are acceptable afterglow candidates for 1308754_g196.
Acceptable entries have no ID, XRT distances < 5.75", 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=233.4280 (15:33:42.72) DEC=-18.0830 (-18:04:58.8)
XRT distances are from RA=233.3870 (15:33:32.88) DEC=-18.1185 (-18:07:06.6)
-----------------
Entry 3 in the list of sources is a candidate afterglow for 1308754_g196 with 3x3 stamp
ra=233.44195 (15:33:46.07) dec=-18.08119 (-18:04:52.3) +/- 1.1" mag=19.46+/-0.35
dist=231.1 REFID=63
*** The position of this source is inconsistent with the XRT position.
The position is 48.2 arc sec from the BAT position.
src: 3 distr. of nearby unmatched sources: 0 0 0 0 0
Found 11 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
233.4377 -18.0845 18.8 -1 USNO-B1 19.13 18.45 18.75
233.4421 -18.0798 5.1 -1 USNO-B1 21.57 16.75 18.89
233.4426 -18.0808 2.6 -1 USNO-B1 18.60 15.96 17.13 *
233.4432 -18.0792 8.4 -1 USNO-B1 18.98 16.85 17.79
233.4435 -18.0792 8.8 -1 USNO-B1 21.78 18.32 19.86
233.4449 -18.0857 19.1 -1 USNO-B1 20.05 18.39 19.13
233.4377 -18.0844 18.5 -1 GSC2.3 18.08 18.86 99.99
233.4380 -18.0788 16.1 -1 GSC2.3 99.99 99.99 99.99
233.4425 -18.0807 2.5 -1 GSC2.3 15.85 18.00 99.99 *
233.4433 -18.0790 9.2 -1 GSC2.3 17.24 18.69 99.99
233.4444 -18.0856 17.9 -1 GSC2.3 99.99 20.53 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 10 in the list of sources is a candidate afterglow for 1308754_g196 with 3x3 stamp
ra=233.40792 (15:33:37.90) dec=-18.08303 (-18:04:58.9) +/- 1.1" mag=19.29+/-0.35
dist=146.4 REFID=60
*** The position of this source is inconsistent with the XRT position.
The position is 68.7 arc sec from the BAT position.
src: 10 distr. of nearby unmatched sources: 0 0 0 0 0
Found 7 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
233.4072 -18.0833 2.8 -1 USNO-B1 18.42 15.01 16.52 *
233.4066 -18.0833 4.7 -1 USNO-B1 19.78 99.99 99.99
233.4040 -18.0821 13.8 -1 USNO-B1 99.99 19.32 99.99
233.4116 -18.0810 14.5 -1 GSC2.3 20.03 99.99 99.99
233.4073 -18.0851 7.9 -1 GSC2.3 99.99 20.71 99.99
233.4071 -18.0833 2.9 -1 GSC2.3 14.79 16.23 99.99 *
233.4041 -18.0820 13.6 -1 GSC2.3 19.59 20.73 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 51 in the list of sources is a candidate afterglow for 1308754_g196 with 3x3 stamp
ra=233.38688 (15:33:32.85) dec=-18.11840 (-18:07:06.3) +/- 1.1" mag=19.44+/-0.35
dist=0.5 REFID=51
src: 51 distr. of nearby unmatched sources: 0 0 0 0 0
Found 0 entries in star catalog(s) within 20.0" of the candidate.
##### This source remains a candidate #####
It has no entries 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=233.38688 (15:33:32.85) dec=-18.11840 (-18:07:06.3) +/- 1.1" mag=19.44+/-0.35 dist=0.5 REFID=51
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 < 5.75",
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 1308754
IMAGE PROBLEM: no overlap
------ Start for Possible Stand-alone Circular ----
In response to GRB250430 (Swift/BAT trigger 1308754) at 17:31:00 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 161 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 none of
the XRT error circle. 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 expected
extinction corresponding to E(B-V) of 0.091.
------- notes for trigger 1308754 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 250502d11h59m38s441743usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1308754
-expid=767727257 -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/1308754/
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.
*** Warning -- BAT and XRT error circles do NOT overlap.
UVOT exposure began at MET 767727257.31966 or about 2025:121:17:34:12 UT
Found 805 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 14% of the srclist region. Found 76 sources in
srclist catalog. Found 4 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 15 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 20.61 mag. Found 139 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
13% of the Genie image region. The XRT position was OUTSIDE the star catalog
search region.
Genie image analysis:
Found 63219.8 counts in the large background region of 5784.0 pixels or a rate
of 10.930 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 19.88 mag. for a
4-arcsec aperture.
Found 1 srclist source(s) within 10.0" of the XRT position.
The brightest such source has ra= 233.3869 dec= -18.1184 mag=19.44 sep=0.53".
The closest srclist source has ra= 233.3869 dec= -18.1184 mag=19.44 sep=0.53".
The closest Genie source has ra= 233.4072 dec= -18.0834 mag=17.57 sep=144.07".
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 150 seconds with the White filter
starting 161 seconds after the BAT trigger. There is a candidate afterglow in
the list of sources generated on-board at
RA(J2000) = 15:33:32.85 = 233.38688
DEC(J2000) = -18:07:06.2 = -18.11840
with a 90%-confidence error radius of about 1.10 arc sec. This position is 0.53
arc sec. from the center of the XRT error circle. The estimated magnitude is
19.44 with a 1-sigma error of about 0.35. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.091.
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?
767727257 161 WHITE 233.38688 -18.11840 19.44/19.2 0.5 srclist Yes
767727257 161 WHITE image found no candidates.
List afterglow candidates for other finding charts.
------- Tokens for Quick GCN -------
CATALOG_TYPE: SRCLIST
FILTER: white
GRB_DEC: -18.11850
GRB_ERROR: 5.75
GRB_RA: 233.38700
IMAGE_START_TIME: 17:34:12
MAGNITUDE: 18.0
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT