image overlap message for exposure 3 of trigger 1344586
uvot_overlap.pl vrs. 2010-12-20b fem started at 250824d01h09m04s645884usUT
The observation of trigger 1344586 started 2025-08-23T20:25:14.4
Examining file ./1344586_g906_uvot_sky_image.fits
The exposure ID is 777673514
The exposure time is 149.857 (seconds)
The filter is WHITE.
The uvot region is centered at (297.4708,-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 3.097 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 2.77 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 0.491 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 1344586
find_uvot_ag.pl vrs. 2023-04-25a fem started at 250824d01h09m26s567292usUT
Observation start time is 2025-08-23T20:25:14.4
Examining file ./1344586_g906_uvot_catalog_image.fits
The exposure ID is 777673514
The exposure is 149.857 sec.
The bin size is 2 pixels
The filter is WHITE
There are 38 detected source(s) for 1344586_g906
Aspect correction adds -0.00118 degrees (-0.283 sec of time = -3.84 arc sec) to RA
Aspect correction adds -0.00025 degrees (-0.92 arcsec) to Dec
Total aspect correction is 3.95 arcsec
Star catalogs centered at 297.4777 , -24.9985 with radius 3.29 arc min.
n_usno: 291 n_gsc: 301
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 38 matched entries is 0.404" for 1344586_g906
Mean and std. dev of mag. difference (MAG_DELTA) are 0.571 and 0.442 for 1344586_g906
Found 1 entries without IDs and 0 entries that are acceptable afterglow candidates for 1344586_g906.
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 NO acceptable entries.
Unidentified entry closest to XRT position is no. 38:
ra=297.44556 dec=-25.00720 +/- 0.6" mag=17.63+/-0.14 dist=114.2 REFID=24 flag=18
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
There are 59731.207 counts in the bkg source region of 5470.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 10.920 counts/pixel (5-sig UL in 4" is 20.05 mag) for 1344586_g906
There are 2307.6565 counts in the xrt source region of 198.00000 pixels.
Rate in xrt region with 8 arcsec radius is 11.655 counts/pixel for 1344586_g906
There are 13160.565 counts in the xrt_bkg source region of 1207.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 10.904 counts/pixel (5-sig UL in 4" is 20.05 mag) for 1344586_g906
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 20.61, 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_777673514_250824d01h09m26s567292usUT_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(297.4708,-25.0003,45")
fk5;-circle(297.475705833564,-24.9974957287387,6")
fk5;-circle(297.471149816509,-24.9889992543658,6")
fk5;-circle(297.4785516321,-25.0108618886923,6")
fk5;-circle(297.472008815102,-25.0049491332944,6")
fk5;-circle(297.474131297023,-25.0136229290819,6")
fk5;-circle(297.461011847667,-24.9933767760034,6")
fk5;-circle(297.4659003163,-25.0059081463317,6")
fk5;-circle(297.46183174847,-25.0001989062979,6")
fk5;-circle(297.468227438216,-25.0126235504914,6")
fk5;-circle(297.45727394161,-25.0011671178413,6")
fk5;-circle(297.459993817697,-25.0098321175529,6")
Region file: 1344586_777673514_250824d01h09m26s567292usUT_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_777673514_250824d01h09m26s567292usUT_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(297.482653444788,-24.9892675093561,6")
fk5;-circle(297.475705833564,-24.9974957287387,6")
image paragraph message for exposure 3 of trigger 1344586
SRCLIST PROBLEM: srclist filled telemetry buffer
------ 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 150 seconds with the White filter
starting 870 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
0.111.
------- notes for trigger 1344586 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 250824d01h09m31s340752usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1344586
-expid=777673514 -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 777673514.35274 or about 2025:236:20:25:09 UT
Found 2305 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 18% of the srclist region. Found 190 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 3 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 38 source(s) in Genie image catalog. Found 1 Genie image source(s)
without IDs. There are 0 good candidate(s) in the Genie image catalog. Good
candidates must be brighter than 20.61 mag. Found 301 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
19% of the Genie image region.
Genie image analysis:
Found 59731.2 counts in the large background region of 5470.0 pixels or a rate
of 10.920 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 19.88 mag. for a
4-arcsec aperture.
Found 2307.7 counts in the XRT position region of 198.0 pixels or a rate of
11.655 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 0.992 +/- 0.344 (1-sigma) cps or
19.61 mag and a range from 19.29 to 20.08 mag. The 3-sigma UL at the XRT
position is 2.024 cps or 18.84 mag. The number of srclist sources filled the
available telemetry. The weakest source detected was 19.09 mag. The closest
srclist source has ra= 297.4759 dec= -24.9975 mag=17.67 sep=10.09". The closest
Genie source has ra= 297.4757 dec= -24.9975 mag=17.01 sep=10.47".
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?
777673514 870 WHITE srclist found no candidates.
777673514 870 WHITE 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.
777672982 338 U srclist found no candidates.
777672982 338 U image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: -24.99558
GRB_ERROR: 5.5
GRB_RA: 297.47812
IMAGE_START_TIME: 20:25:09
MAGNITUDE: 18.8
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT