image overlap message for exposure 1 of trigger 1299965
uvot_overlap.pl vrs. 2010-12-20b fem started at 250331d15h28m45s133382usUT
The observation of trigger 1299965 started 2025-03-31T04:25:36.0
Examining file ./1299965_g351_uvot_sky_image.fits
The exposure ID is 765087935
The exposure time is 149.879 (seconds)
The filter is WHITE.
The uvot region is centered at (71.3724,43.8015) with a roll angle of 252.5
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 (71.3810,43.8050) with a radius of 3.000 arc min
This is 0.426 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 (71.3722,43.8126) with a radius of 0.060 arc min
This is 0.663 arc min from the center of the uvot region
The area of the XRT error circle is 0.011 sq. arc min
The UVOT/XRT overlap is 0.011 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 1 of trigger 1299965
find_uvot_ag.pl vrs. 2023-04-25a fem started at 250331d15h28m49s304120usUT
Observation start time is 2025-03-31T04:25:36.0
Examining file ./1299965_g351_uvot_catalog_image.fits
The exposure ID is 765087935
The exposure is 149.879 sec.
The bin size is 2 pixels
The filter is WHITE
There are 21 detected source(s) for 1299965_g351
Aspect correction adds -0.00078 degrees (-0.187 sec of time = -2.02 arc sec) to RA
Aspect correction adds 0.00031 degrees ( 1.13 arcsec) to Dec
Total aspect correction is 2.31 arcsec
Star catalogs centered at 71.3712 , 43.7950 with radius 2.59 arc min.
n_usno: 155 n_gsc: 234
*** WARNING -- bright star catalog has 2 entries brighter than 12 mag
The brightest has mag 7.87174
RA DEC Mag Color
bright star 0: 71.39785 (04:45:35.48) 43.79299 (+43:47:34.8) 11.04 USNO-V
bright star 1: 71.33811 (04:45:21.15) 43.78571 (+43:47:08.6) 7.87 USNO-V
Mean distance difference (CAT_DELTA) for 11 matched entries is 0.505" for 1299965_g351
Mean and std. dev of mag. difference (MAG_DELTA) are 1.238 and 0.491 for 1299965_g351
Found 10 entries without IDs and 1 entries that are acceptable afterglow candidates for 1299965_g351.
Acceptable entries have no ID, XRT distances < 9", and are > 0.8*(80 - 10*(mag-6))" from any bright star
from any bright star and >21.6" from other rejected sources.
9 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=71.3810 (04:45:31.44) DEC=43.8050 (+43:48:18.0)
XRT distances are from RA=71.3722 (04:45:29.32) DEC=43.8126 (+43:48:45.2)
*** WARNING 47 per cent of entries have no IDs.
-----------------
Entry 11 in the list of sources is a candidate afterglow for 1299965_g351 with genie
ra=71.34217 (04:45:22.12) dec=43.80094 (+43:48:03.4) +/- 0.7" mag=18.85+/-0.17
dist=88.5 REFID=7 major=0.7 minor=0.5 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 101.9 arc sec from the BAT position.
This source is near the edge of image (0.965)
Found 6 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)
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
71.3446 43.8047 14.9 -1 USNO-B1 20.04 17.91 18.86
71.3459 43.7994 11.2 -1 GSC2.3 99.99 20.59 99.99
71.3436 43.7975 13.1 -1 GSC2.3 99.99 20.04 99.99
71.3447 43.8046 14.6 -1 GSC2.3 99.99 19.58 18.75
71.3420 43.8009 0.4 -1 GSC2.3 99.99 17.81 17.14 *
71.3410 43.8045 13.2 -1 GSC2.3 99.99 19.15 18.26
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 5.25" or brighter than 12 mag
Found 2 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
71.3695 43.8129 7.2 -1 USNO-B1 19.66 17.65 18.54
71.3696 43.8129 6.8 -1 GSC2.3 17.50 19.21 18.30
The closest star is 6.83" away.
List UVOT sources within 10" of the XRT position:
There are 2.1079484E+05 counts in the bkg source region of 6085.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 34.642 counts/pixel (5-sig UL in 4" is 19.43 mag) for 1299965_g351
There are 7056.5771 counts in the xrt source region of 200.00000 pixels.
Rate in xrt region with 8 arcsec radius is 35.283 counts/pixel for 1299965_g351
There are 38323.238 counts in the xrt_bkg source region of 1110.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 34.525 counts/pixel (5-sig UL in 4" is 19.43 mag) for 1299965_g351
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 19.98, XRT distances < 9",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 1299965_765087935_250331d15h28m49s304120usUT_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(71.3724,43.8015,45")
fk5;-circle(71.3764740543749,43.8081767808685,6")
fk5;-circle(71.383693097288,43.8126885162188,6")
fk5;-circle(71.3769012441647,43.8125723781885,6")
fk5;-circle(71.3537809452502,43.8006410775426,6")
Region file: 1299965_765087935_250331d15h28m49s304120usUT_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(71.37217,43.81256,8")
Region file: 1299965_765087935_250331d15h28m49s304120usUT_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(71.37217,43.81256,25")
fk5;-circle(71.37217,43.81256,15")
fk5;-circle(71.3764740543749,43.8081767808685,6")
fk5;-circle(71.383693097288,43.8126885162188,6")
fk5;-circle(71.3769012441647,43.8125723781885,6")
image paragraph message for exposure 1 of trigger 1299965
WARNING -- because of the LARGE EXTINCTION, results should be used cautiously.
------ Start for Possible Stand-alone Circular ----
In response to GRB250331 (Swift/BAT trigger 1299965) at 04:19:43 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 317 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 100% of
the XRT 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
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 1299965 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 250331d15h28m53s734481usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1299965
-expid=765087935 -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/1299965/
Links to data for all triggers can be found at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/
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 765087935.99774 or about 2025:091:04:25:30 UT
Found 1267 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 22% of the srclist region. Found 158 sources in
srclist catalog. Found 74 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 21 source(s) in Genie image catalog. Found 10 Genie image source(s)
without IDs. There are 0 good candidate(s) in the Genie image catalog. Good
candidates must be brighter than 19.98 mag. Found 228 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
23% of the Genie image region.
Genie image analysis:
Found 210794.8 counts in the large background region of 6085.0 pixels or a rate
of 34.642 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 19.25 mag. for a
4-arcsec aperture.
Found 7056.6 counts in the XRT position region of 200.0 pixels or a rate of
35.283 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 1.010 +/- 0.607 (1-sigma) cps or
19.59 mag and a range from 19.08 to 20.59 mag. The 3-sigma UL at the XRT
position is 2.832 cps or 18.47 mag. The closest srclist source has ra= 71.3765
dec= 43.8081 mag=16.84 sep=19.68". The closest Genie source has ra= 71.3769
dec= 43.8126 mag=19.14 sep=12.29".
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?
765087935 316 WHITE srclist found no candidates.
765087935 316 WHITE image found no candidates.
List afterglow candidates for other finding charts.
765088489 870 WHITE srclist found no candidates.
765088489 870 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: 43.81256
GRB_ERROR: 9
GRB_RA: 71.37217
IMAGE_START_TIME: 04:25:30
MAGNITUDE: 18.5
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT