image overlap message for exposure 1 of trigger 1342439
uvot_overlap.pl vrs. 2010-12-20b fem started at 250814d07h54m20s931127usUT
The observation of trigger 1342439 started 2025-08-14T07:38:35.4
Examining file ./1342439_g215_uvot_sky_image.fits
The exposure ID is 776849915
The exposure time is 249.924 (seconds)
The filter is U.
The uvot region is centered at (306.3048,48.4047) 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 1.268 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 7.15 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 0.364 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 1 of trigger 1342439
find_uvot_ag.pl vrs. 2023-04-25a fem started at 250814d07h54m25s400211usUT
Observation start time is 2025-08-14T07:38:35.4
Examining file ./1342439_g215_uvot_catalog_image.fits
The exposure ID is 776849915
The exposure is 249.924 sec.
The bin size is 2 pixels
The filter is U
There are 11 detected source(s) for 1342439_g215
Aspect correction adds 0.00040 degrees (0.095 sec of time = 0.95 arc sec) to RA
Aspect correction adds 0.00121 degrees ( 4.35 arcsec) to Dec
Total aspect correction is 4.45 arcsec
Star catalogs centered at 306.3035 , 48.4015 with radius 2.68 arc min.
n_usno: 353 n_gsc: 387
*** 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 11 matched entries is 0.696" for 1342439_g215
Mean and std. dev of mag. difference (MAG_DELTA) are 2.499 and 0.821 for 1342439_g215
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 1342439_g215.
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 17434.174 counts in the bkg source region of 6012.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 2.900 counts/pixel (5-sig UL in 4" is 19.89 mag) for 1342439_g215
There are 587.35248 counts in the xrt source region of 200.00000 pixels.
Rate in xrt region with 8 arcsec radius is 2.937 counts/pixel for 1342439_g215
There are 3258.8113 counts in the xrt_bkg source region of 1159.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 2.812 counts/pixel (5-sig UL in 4" is 19.90 mag) for 1342439_g215
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 20.44, 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_776849915_250814d07h54m25s400211usUT_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(306.3048,48.4047,45")
fk5;-circle(306.300173360295,48.4023272819904,6")
fk5;-circle(306.297299572668,48.3931902040424,6")
fk5;-circle(306.324234285274,48.4011697553275,6")
fk5;-circle(306.291624109677,48.4079727778821,6")
Region file: 1342439_776849915_250814d07h54m25s400211usUT_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_776849915_250814d07h54m25s400211usUT_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(306.300173360295,48.4023272819904,6")
image paragraph message for exposure 1 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 250 seconds with the U filter starting
179 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 19.2 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 18.0 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 250814d07h54m41s922574usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1342439
-expid=776849915 -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/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 776849915.43704 or about 2025:227:07:38:30 UT
Found 3654 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 36% of the srclist region. Found 190 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 25 srclist
source(s) without IDs. There are 0 good candidate(s) in the srclist catalog.
Good candidates must be brighter than 18.12 mag.
Found 11 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 20.44 mag. Found 377 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 17434.2 counts in the large background region of 6012.0 pixels or a rate
of 2.900 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 19.68 mag. for a
4-arcsec aperture.
Found 587.4 counts in the XRT position region of 200.0 pixels or a rate of
2.937 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 0.100 +/- 0.105 (1-sigma) cps or
20.63 mag and a range from 19.86 to 99.99 mag. The 3-sigma UL at the XRT
position is 0.414 cps or 19.09 mag. The number of srclist sources filled the
available telemetry. The weakest source detected was 18.65 mag. The closest
srclist source has ra= 306.2971 dec= 48.3933 mag=16.44 sep=33.32". The closest
Genie source has ra= 306.3002 dec= 48.4023 mag=20.64 sep=22.15".
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?
776849915 179 U srclist found no candidates.
776849915 179 U image found no candidates.
List afterglow candidates for other finding charts.
776850600 864 WHITE srclist found no candidates.
776850600 864 ? image data are not available.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: 48.39903
GRB_ERROR: 5.75
GRB_RA: 306.30800
IMAGE_START_TIME: 07:38:30
MAGNITUDE: 19.1
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT