srclist overlap message for exposure 1 of trigger 1311764
uvot_overlap.pl vrs. 2010-12-20b fem started at 250510d01h53m23s908812usUT
The observation of trigger 1311764 started 2025-05-09T22:35:26.7
Examining file ./1311764_g115_uvot_sky_srclist.fits
The exposure ID is 768522926
The exposure time is undefined.
The filter is WHITE.
The uvot region is centered at (46.4543,-38.8463) with a roll angle of 0.7
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 (46.4550,-38.8530) with a radius of 3.000 arc min
This is 0.404 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 (46.4497,-38.8420) with a radius of 0.038 arc min
This is 0.335 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 1311764
find_uvot_ag.pl vrs. 2023-04-25a fem started at 250510d01h53m25s884071usUT
Observation start time is 2025-05-09T22:35:26.7
Examining file ./1311764_g115_uvot_catalog_srclist.fits
The exposure ID is 768522926
The exposure is 150.000 sec.
The bin size is 2 pixels
The filter is WHITE
There are 15 detected source(s) for 1311764_g115
Aspect correction adds -0.00024 degrees (-0.057 sec of time = -0.66 arc sec) to RA
Aspect correction adds 0.00059 degrees ( 2.12 arcsec) to Dec
Total aspect correction is 2.22 arcsec
Star catalogs centered at 46.4520 , -38.8509 with radius 5.73 arc min.
n_usno: 181 n_gsc: 200
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 11.523
RA DEC Mag Color
bright star 0: 46.37633 (03:05:30.32) -38.90382 (-38:54:13.7) 11.52 USNO-V
Mean distance difference (CAT_DELTA) for 12 matched entries is 0.490" for 1311764_g115
Mean and std. dev of mag. difference (MAG_DELTA) are 0.870 and 0.703 for 1311764_g115
Found 3 entries without IDs and 3 entries that are acceptable afterglow candidates for 1311764_g115.
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.
0 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=46.4550 (03:05:49.20) DEC=-38.8530 (-38:51:10.8)
XRT distances are from RA=46.4497 (03:05:47.92) DEC=-38.8420 (-38:50:31.2)
-----------------
Entry 1 in the list of sources is a candidate afterglow for 1311764_g115 with 5x5 stamp
ra=46.48933 (03:05:57.44) dec=-38.82403 (-38:49:26.5) +/- 1.1" mag=19.48+/-0.35
dist=128.7 REFID=15
*** The position of this source is inconsistent with the XRT position.
The position is 141.9 arc sec from the BAT position.
src: 1 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)
*** If XRT position is correct, then this is NOT the afterglow
-----------------
Entry 4 in the list of sources is a candidate afterglow for 1311764_g115 with 5x5 stamp
ra=46.50827 (03:06:01.99) dec=-38.87421 (-38:52:27.1) +/- 1.1" mag=19.32+/-0.35
dist=201.0 REFID=14
*** The position of this source is inconsistent with the XRT position.
The position is 167.7 arc sec from the BAT position.
src: 4 distr. of nearby unmatched sources: 0 0 0 0 0
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
46.5075 -38.8769 9.8 -1 USNO-B1 21.27 99.99 99.99
46.5081 -38.8766 8.7 -1 USNO-B1 19.82 20.63 20.27
46.5081 -38.8767 8.9 -1 GSC2.3 19.62 19.67 99.99
*** If XRT position is correct, then this is NOT the afterglow
-----------------
Entry 9 in the list of sources is a candidate afterglow for 1311764_g115 with 5x5 stamp
ra=46.46047 (03:05:50.51) dec=-38.90113 (-38:54:04.1) +/- 1.1" mag=19.20+/-0.35
dist=215.0 REFID=13
*** The position of this source is inconsistent with the XRT position.
The position is 173.9 arc sec from the BAT position.
src: 9 distr. of nearby unmatched sources: 0 0 0 0 0
Found 0 entries in star catalog(s) within 20.0" of the candidate.
*** 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:
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 1311764
------ Start for Possible Stand-alone Circular ----
In response to GRB250509 (Swift/BAT trigger 1311764) at 22:33:30 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of nominal 150.000 seconds with the White
filter starting 80 seconds after the BAT trigger. No credible afterglow
candidate has been found in the initial data products. Data from the 2.7'x2.7'
sub-image are not available at this time. 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 0.021.
------- notes for trigger 1311764 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 250510d01h53m27s404537usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1311764
-expid=768522926 -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/1311764/
Links to data for all triggers can be found at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/
*** Warning -- no exposure found, using srclist assumed value.
XRT position found for srclist. BAT position found.
UVOT exposure began at MET 768522926.68904 or about 2025:130:22:35:21 UT
Found 198 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 4% of the srclist region. Found 15 sources in
srclist catalog. Found 3 srclist source(s) without IDs. There are 0 good
candidate(s) in the srclist catalog. Good candidates must be brighter than
19.22 mag.
The closest srclist source has ra= 46.4219 dec= -38.8437 mag=17.01 sep=78.16".
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?
768522926 79 WHITE srclist found no candidates.
768522926 79 ? image data are not available.
List afterglow candidates for other finding charts.
768523138 291 U srclist found no candidates.
768523138 291 U image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: SRCLIST
FILTER: white
GRB_DEC: -38.84200
GRB_ERROR: 5.75
GRB_RA: 46.44967
IMAGE_START_TIME: 22:35:21
MAGNITUDE: 18.0
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT