image overlap message for exposure 1 of trigger 1297508
uvot_overlap.pl vrs. 2010-12-20b fem started at 250321d18h26m28s315216usUT
The observation of trigger 1297508 started 2025-03-21T00:45:22.1
Examining file ./1297508_g163_uvot_sky_image.fits
The exposure ID is 764210722
The exposure time is 149.846 (seconds)
The filter is WHITE.
*** Warning -- found 19242 null pixels in the image.
The uvot region is centered at (295.0843,21.0394) 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 0.421 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 0.792 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 0.00 sq. arc min or 0.00 of the XRT error circle
image afterglow message for exposure 1 of trigger 1297508
find_uvot_ag.pl vrs. 2023-04-25a fem started at 250321d18h26m32s116707usUT
Observation start time is 2025-03-21T00:45:22.1
Examining file ./1297508_g163_uvot_catalog_image.fits
The exposure ID is 764210722
The exposure is 149.846 sec.
The bin size is 2 pixels
The filter is WHITE
There are 6 detected source(s) for 1297508_g163
Aspect correction adds 0.00086 degrees (0.206 sec of time = 2.89 arc sec) to RA
Aspect correction adds -0.00112 degrees (-4.01 arcsec) to Dec
Total aspect correction is 4.94 arcsec
Star catalogs centered at 295.0881 , 21.0504 with radius 2.54 arc min.
n_usno: 324 n_gsc: 586
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 10.41564
RA DEC Mag Color
bright star 0: 295.11378 (19:40:27.31) 21.07286 (+21:04:22.3) 10.42 USNO-V
Mean distance difference (CAT_DELTA) for 6 matched entries is 0.424" for 1297508_g163
Mean and std. dev of mag. difference (MAG_DELTA) are 1.116 and 0.823 for 1297508_g163
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 1297508_g163.
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.
0 sources matched bright stars.
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)
Found 3 entries in star catalog(s) within 10" of the XRT position.
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
295.1002 21.0402 6.2 -1 USNO-B1 20.10 18.91 19.44
295.0977 21.0427 8.6 -1 GSC2.3 19.45 99.99 99.99
295.0992 21.0413 4.4 -1 GSC2.3 20.10 99.99 99.99
The closest star is 4.40" away.
List UVOT sources within 10" of the XRT position:
There are 2660.8955 counts in the bkg source region of 87.000000 pixels.
Rate in bkg region from 0 to 45 arcsec is 30.585 counts/pixel (5-sig UL in 4" is 19.49 mag) for 1297508_g163
There are 0.0000000 counts in the xrt source region of 0.0000000 pixels.
There are 12246.175 counts in the xrt_bkg source region of 406.00000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 30.163 counts/pixel (5-sig UL in 4" is 19.50 mag) for 1297508_g163
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 20.05, XRT distances < 6.5",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 1297508_764210722_250321d18h26m32s116707usUT_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(295.0843,21.0394,45")
Region file: 1297508_764210722_250321d18h26m32s116707usUT_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")
Region file: 1297508_764210722_250321d18h26m32s116707usUT_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(295.09842,21.04039,25")
fk5;-circle(295.09842,21.04039,15")
image paragraph message for exposure 1 of trigger 1297508
IMAGE PROBLEM: no overlap
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 150 seconds with the White filter
starting 127 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 large, but
uncertain, extinction expected.
------- notes for trigger 1297508 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 250321d18h26m36s976076usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1297508
-expid=764210722 -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 srclist. XRT position found for Genie
image. BAT position found.
UVOT exposure began at MET 764210722.07142 or about 2025:081:00:45:17 UT
Found 1800 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 31% of the srclist region. Found 113 sources in
srclist catalog. Found 9 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 6 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 20.05 mag. Found 320 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 34% of the
Genie image region. The Genie image is INCOMPLETE with 19242 null pixels.
Genie image analysis:
Found 2660.9 counts in the large background region of 87.0 pixels or a rate of
30.585 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 19.32 mag. for a
4-arcsec aperture. The closest srclist source has ra= 295.0923 dec= 21.0451
mag=15.44 sep=26.77". The closest Genie source has ra= 295.1087 dec= 21.0485
mag=18.46 sep=45.25".
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?
764210722 127 WHITE srclist found no candidates.
764210722 127 WHITE image found no candidates.
List afterglow candidates for other finding charts.
764210934 339 ? srclist data are not available.
764210934 339 U image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: SRCLIST
FILTER: white
GRB_DEC: 21.04039
GRB_ERROR: 6.5
GRB_RA: 295.09842
IMAGE_START_TIME: 00:45:17
MAGNITUDE: 18.0
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT