image overlap message for exposure 3 of trigger 1401726
uvot_overlap.pl vrs. 2010-12-20b fem started at 251005d20h01m53s924822usUT
The observation of trigger 1401726 started 2025-10-05T16:21:56.4
Examining file ./1401726_g902_uvot_sky_image.fits
The exposure ID is 781374116
The exposure time is 149.868 (seconds)
The filter is WHITE.
The uvot region is centered at (75.6811,16.8828) with a roll angle of 87.3
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 (75.6730,16.8820) with a radius of 3.000 arc min
This is 0.469 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 (75.6833,16.8801) with a radius of 0.035 arc min
This is 0.209 arc min from the center of the uvot region
The area of the XRT error circle is 0.004 sq. arc min
The UVOT/XRT overlap is 0.004 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 3 of trigger 1401726
find_uvot_ag.pl vrs. 2023-04-25a fem started at 251005d20h02m15s943287usUT
Observation start time is 2025-10-05T16:21:56.4
Examining file ./1401726_g902_uvot_catalog_image.fits
The exposure ID is 781374116
The exposure is 149.868 sec.
The bin size is 2 pixels
The filter is WHITE
There are 15 detected source(s) for 1401726_g902
Aspect correction adds 0.00126 degrees (0.303 sec of time = 4.35 arc sec) to RA
Aspect correction adds -0.00049 degrees (-1.77 arcsec) to Dec
Total aspect correction is 4.70 arcsec
Star catalogs centered at 75.6792 , 16.8841 with radius 2.59 arc min.
n_usno: 90 n_gsc: 104
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 15 matched entries is 0.348" for 1401726_g902
Mean and std. dev of mag. difference (MAG_DELTA) are 0.640 and 0.252 for 1401726_g902
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 1401726_g902.
Acceptable entries have no ID, XRT distances < 5.25", 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=75.6730 (05:02:41.52) DEC=16.8820 (+16:52:55.2)
XRT distances are from RA=75.6833 (05:02:44.00) DEC=16.8801 (+16:52:48.3)
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
There are 78348.484 counts in the bkg source region of 6195.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 12.647 counts/pixel (5-sig UL in 4" is 19.97 mag) for 1401726_g902
There are 2560.2368 counts in the xrt source region of 204.00000 pixels.
Rate in xrt region with 8 arcsec radius is 12.550 counts/pixel for 1401726_g902
There are 15525.245 counts in the xrt_bkg source region of 1253.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 12.390 counts/pixel (5-sig UL in 4" is 19.98 mag) for 1401726_g902
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 20.53, XRT distances < 5.25",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 1401726_781374116_251005d20h02m15s943287usUT_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(75.6811,16.8828,45")
fk5;-circle(75.6711044248719,16.8855424799824,6")
Region file: 1401726_781374116_251005d20h02m15s943287usUT_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(75.68333,16.88008,8")
Region file: 1401726_781374116_251005d20h02m15s943287usUT_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(75.68333,16.88008,25")
fk5;-circle(75.68333,16.88008,15")
image paragraph message for exposure 3 of trigger 1401726
------ Start for Possible Stand-alone Circular ----
In response to GRB251005 (Swift/BAT trigger 1401726) at 16:06:53 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 866 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 expected extinction corresponding to E(B-V) of
0.461.
------- notes for trigger 1401726 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 251005d20h02m20s894688usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1401726
-expid=781374116 -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/1401726/
Links to data for all triggers can be found at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/
XRT position found for srclist. XRT position found for Genie image. BAT
position found.
UVOT exposure began at MET 781374116.42598 or about 2025:279:16:21:51 UT
Found 1082 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 9% of the srclist region. Found 161 sources in
srclist catalog. Found 13 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 15 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 20.53 mag. Found 101 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
10% of the Genie image region.
Genie image analysis:
Found 78348.5 counts in the large background region of 6195.0 pixels or a rate
of 12.647 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 19.80 mag. for a
4-arcsec aperture.
Found 2560.2 counts in the XRT position region of 204.0 pixels or a rate of
12.550 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 0.217 +/- 0.363 (1-sigma) cps or
21.26 mag and a range from 20.20 to 99.99 mag. The 3-sigma UL at the XRT
position is 1.307 cps or 19.31 mag. The closest srclist source has ra= 75.6712
dec= 16.8854 mag=19.15 sep=46.06". The closest Genie source has ra= 75.6711
dec= 16.8855 mag=19.09 sep=46.48".
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?
781374116 865 WHITE srclist found no candidates.
781374116 865 WHITE image found no candidates.
List afterglow candidates for other finding charts.
781373373 122 WHITE srclist found no candidates.
781373373 122 WHITE image found no candidates.
781373586 335 U srclist found no candidates.
781373586 335 U image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: 16.88008
GRB_ERROR: 5.25
GRB_RA: 75.68333
IMAGE_START_TIME: 16:21:51
MAGNITUDE: 19.3
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT