image overlap message for exposure 1 of trigger 1343270
uvot_overlap.pl vrs. 2010-12-20b fem started at 250818d16h26m07s177190usUT
The observation of trigger 1343270 started 2025-08-18T01:34:41.3
Examining file ./1343270_g198_uvot_sky_image.fits
The exposure ID is 777173681
The exposure time is 249.935 (seconds)
The filter is U.
*** Warning -- found 22548 null pixels in the image.
The uvot region is centered at (213.7861,-58.0124) with a roll angle of 296.9
It is square with sides of 2.68 arc min. for an area of 7.17 sq arc min
The BAT error circle is centered at (213.8330,-58.0070) with a radius of 3.000 arc min
This is 1.525 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 at most 5.23 sq. arc min or 0.19 of the BAT error circle
The XRT error circle is centered at (213.8001,-58.0140) with a radius of 0.040 arc min
This is 0.457 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 0.00 sq. arc min or 0.00 of the XRT error circle
image afterglow message for exposure 1 of trigger 1343270
find_uvot_ag.pl vrs. 2023-04-25a fem started at 250818d16h26m13s663543usUT
Observation start time is 2025-08-18T01:34:41.3
Examining file ./1343270_g198_uvot_catalog_image.fits
The exposure ID is 777173681
The exposure is 249.935 sec.
The bin size is 2 pixels
The filter is U
There are 5 detected source(s) for 1343270_g198
Aspect correction adds -0.00245 degrees (-0.587 sec of time = -4.67 arc sec) to RA
Aspect correction adds 0.00044 degrees ( 1.57 arcsec) to Dec
Total aspect correction is 4.92 arcsec
Star catalogs centered at 213.7794 , -58.0206 with radius 2.60 arc min.
n_usno: 526 n_gsc: 545
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 11.41
RA DEC Mag Color
bright star 0: 213.81227 (14:15:14.95) -58.04564 (-58:02:44.3) 11.41 USNO-R
Mean distance difference (CAT_DELTA) for 7 matched entries is 0.922" for 1343270_g198
Mean and std. dev of mag. difference (MAG_DELTA) are 0.760 and 1.545 for 1343270_g198
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 1343270_g198.
Acceptable entries have no ID, XRT distances < 6", 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=213.8330 (14:15:19.92) DEC=-58.0070 (-58:00:25.2)
XRT distances are from RA=213.8001 (14:15:12.03) DEC=-58.0140 (-58:00:50.5)
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
There are 0.0000000 counts in the bkg source region of 0.0000000 pixels.
There are 0.0000000 counts in the xrt source region of 0.0000000 pixels.
There are 0.0000000 counts in the xrt_bkg source region of 0.0000000 pixels.
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 18.32, XRT distances < 6",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 1343270_777173681_250818d16h26m13s663543usUT_bkg.region
# Region file format: DS9 version 3.0
global color=red font="helvetica 10 normal" select=1 edit=1 move=1 delete=1 include=1 fixed=0 source
fk5;circle(213.7861,-58.0124,45")
Region file: 1343270_777173681_250818d16h26m13s663543usUT_xrt.region
# Region file format: DS9 version 3.0
global color=red font="helvetica 10 normal" select=1 edit=1 move=1 delete=1 include=1 fixed=0 source
fk5;circle(213.80013,-58.01403,8")
Region file: 1343270_777173681_250818d16h26m13s663543usUT_xrt_bkg.region
# Region file format: DS9 version 3.0
global color=red font="helvetica 10 normal" select=1 edit=1 move=1 delete=1 include=1 fixed=0 source
fk5;circle(213.80013,-58.01403,25")
fk5;-circle(213.80013,-58.01403,15")
image paragraph message for exposure 1 of trigger 1343270
THIS MESSAGE IS *NOT* READY FOR DISTRIBUTION.
MORE ANALYSIS IS REQUIRED TO DETERMINE WHETHER THERE IS AN AFTERGLOW CANDIDATE.
IMAGE PROBLEM: no overlap
SRCLIST PROBLEM: high density of stars, srclist filled telemetry buffer
See notes for more details.
WARNING -- because of the LARGE EXTINCTION, results should be used cautiously.
------ Start for Possible Stand-alone Circular ----
In response to GRB250818 (Swift/BAT trigger 1343270) at 01:31:22 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
162 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. Because of the density of catalogued
stars, further analysis is required to report an upper limit for any afterglow
in the region. No correction has been made for the large, but uncertain,
extinction expected.
------- notes for trigger 1343270 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 250818d16h26m24s044909usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1343270
-expid=777173681 -meonly -msg_image
Results from standard processing of UVOT TDRSS data for this trigger should be
available at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/1343270/
Links to data for all triggers can be found at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/
Large extinction of 5.454 found for bat position. Unreliable extinction found
for xrt position. XRT position found for srclist. XRT position found for Genie
image. BAT position found.
UVOT exposure began at MET 777173681.319 or about 2025:231:01:34:36 UT
Since the srclist star catalog filled its buffer, the sensitivity for an
afterglow may be REDUCED. The stars will eliminate afterglows from about 47%
or more of the srclist region. Found 190 sources in srclist catalog. WARNING --
srclist catalog buffer filled. Found 25 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 5 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 18.32 mag. Found 522 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 53% of the
Genie image region. The Genie image is INCOMPLETE with 22548 null pixels.
Found no Genie image background information. The number of srclist sources
filled the available telemetry. The weakest source detected was 18.41 mag. The
closest srclist source has ra= 213.8012 dec= -58.0050 mag=17.02 sep=32.60". The
closest Genie source has ra= 213.7598 dec= -58.0277 mag=18.24 sep=91.25".
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?
777173681 162 U srclist found no candidates.
777173681 162 U image found no candidates.
List afterglow candidates for other finding charts.
------- Tokens for Quick GCN -------