image overlap message for exposure 2 of trigger 1297508
uvot_overlap.pl vrs. 2010-12-20b fem started at 250321d18h26m29s032188usUT
The observation of trigger 1297508 started 2025-03-21T00:48:54.1
Examining file ./1297508_g375_uvot_sky_image.fits
The exposure ID is 764210934
The exposure time is 36.344 (seconds)
The filter is U.
*** Warning -- no aspect solution was applied to the image.
consequently the calculated overlaps are questionable.
*** Warning -- found 13752 null pixels in the image.
The uvot region is centered at (295.0827,21.0409) with a roll angle of 99.0
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 (295.0770,21.0410) with a radius of 3.000 arc min
This is 0.320 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
The XRT error circle is centered at (295.0984,21.0404) with a radius of 0.043 arc min
This is 0.880 arc min from the center of the uvot region
The area of the XRT error circle is 0.006 sq. arc min
The UVOT/XRT overlap is 0.006 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 2 of trigger 1297508
find_uvot_ag.pl vrs. 2023-04-25a fem started at 250321d18h26m40s299280usUT
Observation start time is 2025-03-21T00:48:54.1
Examining file ./1297508_g375_uvot_sources_image.fits
The exposure ID is 764210934
The exposure is 36.344 sec.
The bin size is 2 pixels
The filter is U
There are 1 detected source(s) for 1297508_g375
*** WARNING -- Aspect solution FAILED.
Results need to be checked by, for example, blinking image with DS9.
Star catalogs centered at 295.0850 , 21.0426 with radius 2.00 arc min.
n_usno: 207 n_gsc: 371
Bright star catalog has no entries brighter than 12 mag
Found 1 entries without IDs and 0 entries that are acceptable afterglow candidates for 1297508_g375.
Acceptable entries have no ID, XRT distances < 6.5", 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=295.0770 (19:40:18.48) DEC=21.0410 (+21:02:27.6)
XRT distances are from RA=295.0984 (19:40:23.62) DEC=21.0404 (+21:02:25.4)
*** WARNING 100 per cent of entries have no IDs.
Found NO acceptable entries.
Unidentified entry closest to XRT position is no. 0:
ra=295.08504 dec= 21.04258 +/- 0.7" mag= NaN+/-0.14 dist=45.6 REFID=1 flag=16
Found 10 entries in star catalog(s) within 20" of the XRT position.
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
295.0933 21.0430 19.5 -1 USNO-B1 19.91 17.93 18.81
295.1002 21.0402 6.2 -1 USNO-B1 20.10 18.91 19.44
295.1006 21.0379 11.6 -1 USNO-B1 20.32 18.55 19.34
295.1023 21.0438 18.0 -1 USNO-B1 20.50 18.98 19.65
295.0943 21.0378 16.8 -1 GSC2.3 19.17 99.99 99.99
295.0969 21.0457 19.7 -1 GSC2.3 20.12 99.99 99.99
295.0977 21.0427 8.6 -1 GSC2.3 19.45 99.99 99.99
295.0961 21.0358 18.2 -1 GSC2.3 19.25 99.99 99.99
295.0992 21.0413 4.4 -1 GSC2.3 20.10 99.99 99.99
295.1031 21.0383 17.4 -1 GSC2.3 19.56 99.99 99.99
The closest star is 4.40" away.
List UVOT sources within 20" of the XRT position:
There are 3.6820322E+06 counts in the bkg source region of 2529.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 1455.924 counts/pixel (5-sig UL in 4" is 14.42 mag) for 1297508_g375
There are 393.62741 counts in the xrt source region of 195.00000 pixels.
Rate in xrt region with 8 arcsec radius is 2.019 counts/pixel for 1297508_g375
XRT source is too far (52.8505932585076") from center -- do not compute local background.
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 14.97, XRT distances < 6.5",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Results are questionable because aspect solution FAILED.
Region file: 1297508_764210934_250321d18h26m40s299280usUT_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(295.0827,21.0409,45")
fk5;-circle(295.085039109147,21.0425803230954,6")
Region file: 1297508_764210934_250321d18h26m40s299280usUT_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(295.09842,21.04039,8")
image paragraph message for exposure 2 of trigger 1297508
THIS MESSAGE IS *NOT* READY FOR DISTRIBUTION.
MORE ANALYSIS IS REQUIRED TO DETERMINE WHETHER THERE IS AN AFTERGLOW CANDIDATE.
IMAGE PROBLEM: no aspect solution
SRCLIST PROBLEM: no srclist afterglow info
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 GRB250321 (Swift/BAT trigger 1297508) at 00:42:38 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 36 seconds with the U filter starting
339 seconds after the BAT trigger. No credible afterglow candidate has been
found in the initial data products. The 2.7'x2.7' sub-image processing FAILED
because of no aspect solution. Results from the list of sources generated
on-board are not available at this time. No correction has been made for the
large, but uncertain, extinction expected.
------- notes for trigger 1297508 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 250321d18h26m44s718900usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1297508
-expid=764210934 -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/1297508/
Links to data for all triggers can be found at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/
Large extinction of 14.477 found for bat position. Unreliable extinction found
for xrt position. XRT position found for Genie image. BAT position found.
UVOT exposure began at MET 764210934.1241 or about 2025:081:00:48:49 UT
No information found about the number of stars in the star catalog for srclist
region.
THERE IS NO ASPECT SOLUTION for the image data.
Found 1 source(s) in Genie image catalog. Found 1 Genie image source(s) without
IDs. There are 0 good candidate(s) in the Genie image catalog. Good candidates
must be brighter than 14.97 mag. Found 203 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 35% of the
Genie image region. The Genie image is INCOMPLETE with 13752 null pixels.
The closest Genie source has ra= 295.0850 dec= 21.0426 mag= NaN sep=45.65".
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?
764210934 339 U srclist data are not available.
764210934 339 U image found no candidates.
List afterglow candidates for other finding charts.
764210722 127 WHITE srclist found no candidates.
764210722 127 WHITE image found no candidates.
------- Tokens for Quick GCN -------