image overlap message for exposure 2 of trigger 1342439
uvot_overlap.pl vrs. 2010-12-20b fem started at 250814d07h55m56s092672usUT
The observation of trigger 1342439 started 2025-08-14T07:50:00.4
Examining file 1342439_g900_uvot_sky_image.fits
The exposure ID is 776850600
The exposure time is 149.868 (seconds)
The filter is WHITE.
The uvot region is centered at (306.3023,48.4057) with a roll angle of 340.8
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 (306.3290,48.3910) with a radius of 3.000 arc min
This is 1.379 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 7.10 sq. arc min or 0.25 of the BAT error circle
The XRT error circle is centered at (306.3080,48.3990) with a radius of 0.038 arc min
This is 0.457 arc min from the center of the uvot region
The area of the XRT error circle is 0.005 sq. arc min
The UVOT/XRT overlap is 0.005 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 2 of trigger 1342439
find_uvot_ag.pl vrs. 2023-04-25a fem started at 250814d07h55m57s155738usUT
Observation start time is 2025-08-14T07:50:00.4
Examining file 1342439_g900_uvot_catalog_image.fits
The exposure ID is 776850600
The exposure is 149.868 sec.
The bin size is 2 pixels
The filter is WHITE
There are 30 detected source(s) for 1342439_g900
Aspect correction adds 0.00052 degrees (0.124 sec of time = 1.24 arc sec) to RA
Aspect correction adds 0.00155 degrees ( 5.58 arcsec) to Dec
Total aspect correction is 5.72 arcsec
Star catalogs centered at 306.3029 , 48.4041 with radius 2.76 arc min.
n_usno: 370 n_gsc: 412
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 11.5043
RA DEC Mag Color
bright star 0: 306.33972 (20:25:21.53) 48.43374 (+48:26:01.5) 11.50 USNO-V
Mean distance difference (CAT_DELTA) for 31 matched entries is 0.492" for 1342439_g900
Mean and std. dev of mag. difference (MAG_DELTA) are 1.809 and 0.525 for 1342439_g900
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 1342439_g900.
Acceptable entries have no ID, XRT distances < 5.75", 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=306.3290 (20:25:18.96) DEC=48.3910 (+48:23:27.6)
XRT distances are from RA=306.3080 (20:25:13.92) DEC=48.3990 (+48:23:56.5)
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
There are 53389.695 counts in the bkg source region of 5723.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 9.329 counts/pixel (5-sig UL in 4" is 20.14 mag) for 1342439_g900
There are 1709.1887 counts in the xrt source region of 200.00000 pixels.
Rate in xrt region with 8 arcsec radius is 8.546 counts/pixel for 1342439_g900
There are 10350.567 counts in the xrt_bkg source region of 1165.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 8.885 counts/pixel (5-sig UL in 4" is 20.16 mag) for 1342439_g900
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 20.69, XRT distances < 5.75",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 1342439_776850600_250814d07h55m57s155738usUT_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(306.3023,48.4057,45")
fk5;-circle(306.300061115359,48.4024545806016,6")
fk5;-circle(306.297206056964,48.3932652563355,6")
fk5;-circle(306.290647502243,48.3957490647747,6")
fk5;-circle(306.29155246995,48.4081012214981,6")
fk5;-circle(306.320943898687,48.4104326741225,6")
fk5;-circle(306.283892113175,48.4034038536132,6")
fk5;-circle(306.291593396126,48.4118491274515,6")
fk5;-circle(306.2907304553,48.4140974971105,6")
Region file: 1342439_776850600_250814d07h55m57s155738usUT_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(306.30800,48.39903,8")
Region file: 1342439_776850600_250814d07h55m57s155738usUT_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(306.30800,48.39903,25")
fk5;-circle(306.30800,48.39903,15")
fk5;-circle(306.300061115359,48.4024545806016,6")
image paragraph message for exposure 2 of trigger 1342439
SRCLIST PROBLEM: srclist filled telemetry buffer
------ Start for Possible Stand-alone Circular ----
In response to GRB250814 (Swift/BAT trigger 1342439) at 07:34:59 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 864 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
1.061.
------- notes for trigger 1342439 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 250814d07h55m58s522065usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1342439
-expid=776850600 -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/1342439/
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 776850600.42688 or about 2025:227:07:49:55 UT
Found 3869 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 35% of the srclist region. Found 190 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 7 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 30 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 20.69 mag. Found 401 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
36% of the Genie image region.
Genie image analysis:
Found 53389.7 counts in the large background region of 5723.0 pixels or a rate
of 9.329 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 19.96 mag. for a
4-arcsec aperture.
Found 1709.2 counts in the XRT position region of 200.0 pixels or a rate of
8.546 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is -0.452 +/- 0.299 (1-sigma) cps. The
3-sigma UL at the XRT position is 0.898 cps or 19.72 mag. The number of srclist
sources filled the available telemetry. The weakest source detected was 18.88
mag. The closest srclist source has ra= 306.2971 dec= 48.3934 mag=16.01
sep=33.18". The closest Genie source has ra= 306.3001 dec= 48.4025 mag=18.96
sep=22.63".
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?
776850600 864 WHITE srclist found no candidates.
776850600 864 WHITE image found no candidates.
List afterglow candidates for other finding charts.
776849915 179 U srclist found no candidates.
776849915 179 U image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: 48.39903
GRB_ERROR: 5.75
GRB_RA: 306.30800
IMAGE_START_TIME: 07:49:55
MAGNITUDE: 19.7
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT