image overlap message for exposure 2 of trigger 1344586
uvot_overlap.pl vrs. 2010-12-20b fem started at 250824d01h09m04s063904usUT
The observation of trigger 1344586 started 2025-08-23T20:16:22.2
Examining file ./1344586_g374_uvot_sky_image.fits
The exposure ID is 777672982
The exposure time is 249.935 (seconds)
The filter is U.
The uvot region is centered at (297.4717,-25.0003) with a roll angle of 254.1
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 (297.5210,-24.9760) with a radius of 3.000 arc min
This is 3.049 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 2.89 sq. arc min or 0.10 of the BAT error circle
The XRT error circle is centered at (297.4781,-24.9956) with a radius of 0.037 arc min
This is 0.447 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 2 of trigger 1344586
find_uvot_ag.pl vrs. 2023-04-25a fem started at 250824d01h09m12s402459usUT
Observation start time is 2025-08-23T20:16:22.2
Examining file ./1344586_g374_uvot_catalog_image.fits
The exposure ID is 777672982
The exposure is 249.935 sec.
The bin size is 2 pixels
The filter is U
There are 23 detected source(s) for 1344586_g374
Aspect correction adds -0.00102 degrees (-0.245 sec of time = -3.33 arc sec) to RA
Aspect correction adds -0.00033 degrees (-1.18 arcsec) to Dec
Total aspect correction is 3.54 arcsec
Star catalogs centered at 297.4856 , -24.9995 with radius 3.11 arc min.
n_usno: 276 n_gsc: 285
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 24 matched entries is 0.418" for 1344586_g374
Mean and std. dev of mag. difference (MAG_DELTA) are 0.528 and 0.540 for 1344586_g374
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 1344586_g374.
Acceptable entries have no ID, XRT distances < 5.5", 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=297.5210 (19:50:05.04) DEC=-24.9760 (-24:58:33.6)
XRT distances are from RA=297.4781 (19:49:54.75) DEC=-24.9956 (-24:59:44.1)
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
There are 18317.641 counts in the bkg source region of 5893.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 3.108 counts/pixel (5-sig UL in 4" is 19.85 mag) for 1344586_g374
There are 685.01923 counts in the xrt source region of 201.00000 pixels.
Rate in xrt region with 8 arcsec radius is 3.408 counts/pixel for 1344586_g374
There are 3724.1060 counts in the xrt_bkg source region of 1207.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 3.085 counts/pixel (5-sig UL in 4" is 19.85 mag) for 1344586_g374
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 20.40, XRT distances < 5.5",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 1344586_777672982_250824d01h09m12s402459usUT_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(297.4717,-25.0003,45")
fk5;-circle(297.47571152733,-24.9974921394196,6")
fk5;-circle(297.478601588286,-25.0108813700516,6")
fk5;-circle(297.474123118137,-25.0136077837686,6")
fk5;-circle(297.461094995988,-24.9933102516669,6")
fk5;-circle(297.46584446605,-25.0058946613327,6")
fk5;-circle(297.45728041022,-25.0011581633229,6")
Region file: 1344586_777672982_250824d01h09m12s402459usUT_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(297.47812,-24.99558,8")
Region file: 1344586_777672982_250824d01h09m12s402459usUT_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(297.47812,-24.99558,25")
fk5;-circle(297.47812,-24.99558,15")
fk5;-circle(297.482684728556,-24.9893083922074,6")
fk5;-circle(297.47571152733,-24.9974921394196,6")
image paragraph message for exposure 2 of trigger 1344586
------ Start for Possible Stand-alone Circular ----
In response to GRB250823 (Swift/BAT trigger 1344586) at 20:10:07 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
338 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
0.111.
------- notes for trigger 1344586 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 250824d01h09m18s426422usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1344586
-expid=777672982 -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/1344586/
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 777672982.21312 or about 2025:236:20:16:17 UT
Found 1323 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 18% of the srclist region. Found 81 sources in
srclist catalog. Found 2 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 23 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 20.40 mag. Found 285 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
20% of the Genie image region.
Genie image analysis:
Found 18317.6 counts in the large background region of 5893.0 pixels or a rate
of 3.108 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 19.64 mag. for a
4-arcsec aperture.
Found 685.0 counts in the XRT position region of 201.0 pixels or a rate of
3.408 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 0.259 +/- 0.112 (1-sigma) cps or
19.60 mag and a range from 19.21 to 20.22 mag. The 3-sigma UL at the XRT
position is 0.596 cps or 18.69 mag. The closest srclist source has ra= 297.4758
dec= -24.9976 mag=17.50 sep=10.45". The closest Genie source has ra= 297.4757
dec= -24.9975 mag=17.03 sep=10.45".
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?
777672982 338 U srclist found no candidates.
777672982 338 U image found no candidates.
List afterglow candidates for other finding charts.
777672770 126 ? srclist data are not available.
777672770 126 WHITE image found no candidates.
777673514 870 WHITE srclist found no candidates.
777673514 870 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: -24.99558
GRB_ERROR: 5.5
GRB_RA: 297.47812
IMAGE_START_TIME: 20:16:17
MAGNITUDE: 18.7
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT