image overlap message for exposure 1 of trigger 1350381
uvot_overlap.pl vrs. 2010-12-20b fem started at 250917d06h36m31s317080usUT
The observation of trigger 1350381 started 2025-09-17T06:30:39.3
Examining file 1350381_g174_uvot_sky_image.fits
The exposure ID is 779783439
The exposure time is 149.857 (seconds)
The filter is WHITE.
The uvot region is centered at (291.3696,11.1129) with a roll angle of 277.8
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 (291.3780,11.1130) with a radius of 3.000 arc min
This is 0.493 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 7.17 sq. arc min or 0.25 of the BAT error circle
Could not find the location of an XRT error circle
image afterglow message for exposure 1 of trigger 1350381
find_uvot_ag.pl vrs. 2023-04-25a fem started at 250917d06h36m33s293479usUT
Observation start time is 2025-09-17T06:30:39.3
Examining file 1350381_g174_uvot_catalog_image.fits
The exposure ID is 779783439
The exposure is 149.857 sec.
The bin size is 2 pixels
The filter is WHITE
There are 37 detected source(s) for 1350381_g174
Aspect correction adds -0.00064 degrees (-0.154 sec of time = -2.26 arc sec) to RA
Aspect correction adds 0.00005 degrees ( 0.17 arcsec) to Dec
Total aspect correction is 2.27 arcsec
Star catalogs centered at 291.3709 , 11.1103 with radius 2.69 arc min.
n_usno: 288 n_gsc: 534
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 10.5392
RA DEC Mag Color
bright star 0: 291.34622 (19:25:23.09) 11.11474 (+11:06:53.1) 10.54 USNO-V
*** WARNING -- no XRT distances are available.
Mean distance difference (CAT_DELTA) for 36 matched entries is 0.650" for 1350381_g174
Mean and std. dev of mag. difference (MAG_DELTA) are 2.352 and 0.586 for 1350381_g174
Found 3 entries without IDs and 0 entries that are acceptable afterglow candidates for 1350381_g174.
Acceptable entries have no ID, BAT distance < 200" or XRT distance < 10", and are > 0.8*(80 - 10*(mag-6))" from any bright star
from any bright star and >21.6" from other rejected sources.
3 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=291.3780 (19:25:30.72) DEC=11.1130 (+11:06:46.8)
XRT distances are as reported in catalog file.
Found NO acceptable entries.
Unidentified entry closest to BAT position is no. 30:
ra=291.35078 dec= 11.11268 +/- 0.6" mag=16.59+/-0.14 dist=96.2 REFID=16 flag=3
There are 55978.508 counts in the bkg source region of 5567.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 10.055 counts/pixel (5-sig UL in 4" is 20.10 mag) for 1350381_g174
Good candidates have no ID, acceptable profiles,
mag between 9.01 and 20.09, BAT distances < 200",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 1350381_779783439_250917d06h36m33s293479usUT_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(291.3696,11.1129,45")
fk5;-circle(291.381125245164,11.110712375586,6")
fk5;-circle(291.37374019722,11.115849604516,6")
fk5;-circle(291.376467375157,11.1202670531312,6")
fk5;-circle(291.373605999749,11.1066806807314,6")
fk5;-circle(291.367058557981,11.1081057104185,6")
fk5;-circle(291.364115442375,11.1156895332667,6")
fk5;-circle(291.357874829464,11.1148527854413,6")
fk5;-circle(291.356588243092,11.1073150767644,6")
image paragraph message for exposure 1 of trigger 1350381
THIS MESSAGE IS *NOT* READY FOR DISTRIBUTION.
MORE ANALYSIS IS REQUIRED TO DETERMINE WHETHER THERE IS AN AFTERGLOW CANDIDATE.
IMAGE PROBLEM: partial overlap
SRCLIST PROBLEM: 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 GRB250917 (Swift/BAT trigger 1350381) at 06:27:44 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 138 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 25% of
the BAT error circle. The typical 3-sigma upper limit has been about 19.6 mag.
The 8'x8' region for the list of sources generated on-board covers 100% of the
BAT error circle. The list of sources is typically complete to about 18 mag. No
correction has been made for the large, but uncertain, extinction expected.
------- notes for trigger 1350381 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 250917d06h36m34s861178usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1350381
-expid=779783439 -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/1350381/
Links to data for all triggers can be found at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/
Unreliable extinction found for bat position. No XRT position found for
srclist. No XRT position found for Genie image. BAT position found.
UVOT exposure began at MET 779783439.3242 or about 2025:261:06:30:34 UT
Found 2172 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 40% of the srclist region. Found 190 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 67 srclist
source(s) without IDs. There are 0 good candidate(s) in the srclist catalog.
Good candidates must be brighter than 18.66 mag.
Found 37 source(s) in Genie image catalog. Found 3 Genie image source(s)
without IDs. There are 0 good candidate(s) in the Genie image catalog. Good
candidates must be brighter than 20.09 mag. Found 414 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
39% of the Genie image region.
Genie image analysis:
Found 55978.5 counts in the large background region of 5567.0 pixels or a rate
of 10.055 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 19.92 mag. for a
4-arcsec aperture. The number of srclist sources filled the available
telemetry. The weakest source detected was 19.35 mag.
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?
779783439 138 WHITE srclist found no candidates.
779783439 138 WHITE image found no candidates.
List afterglow candidates for other finding charts.
------- Tokens for Quick GCN -------