image overlap message for exposure 1 of trigger 1339848
uvot_overlap.pl vrs. 2010-12-20b fem started at 250805d12h53m15s764156usUT
The observation of trigger 1339848 started 2025-08-05T07:08:41.5
Examining file ./1339848_g3572_uvot_sky_image.fits
The exposure ID is 776070521
The exposure time is 149.857 (seconds)
The filter is WHITE.
The uvot region is centered at (24.2158,-81.4074) with a roll angle of 108.7
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 (24.1530,-81.4060) with a radius of 3.000 arc min
This is 0.569 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 (24.2121,-81.4018) with a radius of 0.040 arc min
This is 0.339 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 1339848
find_uvot_ag.pl vrs. 2023-04-25a fem started at 250805d12h53m18s089964usUT
Observation start time is 2025-08-05T07:08:41.5
Examining file ./1339848_g3572_uvot_catalog_image.fits
The exposure ID is 776070521
The exposure is 149.857 sec.
The bin size is 2 pixels
The filter is WHITE
There are 11 detected source(s) for 1339848_g3572
Aspect correction adds 0.01219 degrees (2.926 sec of time = 6.56 arc sec) to RA
Aspect correction adds -0.00059 degrees (-2.11 arcsec) to Dec
Total aspect correction is 6.89 arcsec
Star catalogs centered at 24.2122 , -81.4032 with radius 2.45 arc min.
n_usno: 86 n_gsc: 59
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 11.71194
RA DEC Mag Color
bright star 0: 23.99974 (01:35:59.94) -81.37769 (-81:22:39.7) 11.71 USNO-V
Mean distance difference (CAT_DELTA) for 4 matched entries is 0.697" for 1339848_g3572
Mean and std. dev of mag. difference (MAG_DELTA) are 0.919 and 0.174 for 1339848_g3572
Found 7 entries without IDs and 7 entries that are acceptable afterglow candidates for 1339848_g3572.
Acceptable entries have no ID, XRT distances < 6", 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=24.1530 (01:36:36.72) DEC=-81.4060 (-81:24:21.6)
XRT distances are from RA=24.2121 (01:36:50.90) DEC=-81.4018 (-81:24:06.3)
*** WARNING 63 per cent of entries have no IDs.
-----------------
Entry 0 in the list of sources is a candidate afterglow for 1339848_g3572 with genie
ra=24.14847 (01:36:35.63) dec=-81.41130 (-81:24:40.7) +/- 0.7" mag=16.71+/-0.14
dist=48.5 REFID=6 major=7.7 minor=2.2 flag=2 (blended)
*** The position of this source is inconsistent with the XRT position.
The position is 15.7 arc sec from the BAT position.
Found 2 entries in star catalog(s) within 20.0" of the candidate.
printing all entries
(Entries within 2 arc sec of a source list entry are considered a match)
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
24.1312 -81.4139 13.3 -1 USNO-B1 14.97 12.00 13.32 *
24.1302 -81.4138 13.2 -1 GSC2.3 12.13 12.94 99.99
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 3.5" or brighter than 12 mag
-----------------
Entry 1 in the list of sources is a candidate afterglow for 1339848_g3572 with genie
ra=24.20224 (01:36:48.54) dec=-81.40700 (-81:24:25.2) +/- 0.8" mag=19.75+/-0.17
dist=19.6 REFID=5 major=1.2 minor=1.0 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 26.5 arc sec from the BAT position.
Found 4 entries in star catalog(s) within 20.0" of the candidate.
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
24.2098 -81.4052 7.8 -1 USNO-B1 21.02 19.65 20.26
24.2067 -81.4068 2.5 -1 USNO-B1 22.68 19.04 20.66 *
24.2095 -81.4049 8.4 -1 GSC2.3 19.20 21.18 99.99
24.2039 -81.4069 0.9 -1 GSC2.3 19.06 19.71 99.99 *
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 3.5" or brighter than 12 mag
-----------------
Entry 2 in the list of sources is a candidate afterglow for 1339848_g3572 with genie
ra=24.12806 (01:36:30.73) dec=-81.41396 (-81:24:50.3) +/- 0.7" mag=13.69+/-0.14
dist=63.0 REFID=10 major=1.0 minor=0.9 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 28.4 arc sec from the BAT position.
Found 3 entries in star catalog(s) within 20.0" of the candidate.
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
24.1312 -81.4139 1.7 -1 USNO-B1 14.97 12.00 13.32 *
24.0995 -81.4138 15.3 -1 USNO-B1 20.33 20.10 20.20
24.1302 -81.4138 1.4 -1 GSC2.3 12.13 12.94 99.99 *
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 3.5" or brighter than 12 mag
-----------------
Entry 3 in the list of sources is a candidate afterglow for 1339848_g3572 with genie
ra=24.09825 (01:36:23.58) dec=-81.41263 (-81:24:45.5) +/- 0.7" mag=16.66+/-0.14
dist=72.7 REFID=8 major=6.0 minor=3.9 flag=3 (neighbor+blended)
*** The position of this source is inconsistent with the XRT position.
The position is 35.8 arc sec from the BAT position.
Found 3 entries in star catalog(s) within 20.0" of the candidate.
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
24.1312 -81.4139 18.3 -1 USNO-B1 14.97 12.00 13.32 *
24.0995 -81.4138 4.2 -1 USNO-B1 20.33 20.10 20.20
24.1302 -81.4138 17.6 -1 GSC2.3 12.13 12.94 99.99
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 3.5" or brighter than 12 mag
-----------------
Entry 4 in the list of sources is a candidate afterglow for 1339848_g3572 with genie
ra=24.18269 (01:36:43.85) dec=-81.39656 (-81:23:47.6) +/- 0.8" mag=18.91+/-0.15
dist=24.5 REFID=3 major=0.9 minor=0.8 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 40.9 arc sec from the BAT position.
Found 2 entries in star catalog(s) within 20.0" of the candidate.
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
24.1857 -81.3966 1.6 -1 USNO-B1 20.41 17.54 18.81 *
24.1843 -81.3965 0.8 -1 GSC2.3 17.81 18.52 99.99 *
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 3.5" or brighter than 12 mag
-----------------
Entry 5 in the list of sources is a candidate afterglow for 1339848_g3572 with genie
ra=24.13670 (01:36:32.81) dec=-81.41819 (-81:25:05.5) +/- 0.7" mag=17.52+/-0.14
dist=71.7 REFID=7 major=6.0 minor=3.4 flag=3 (neighbor+blended)
*** The position of this source is inconsistent with the XRT position.
The position is 41.2 arc sec from the BAT position.
Found 2 entries in star catalog(s) within 20.0" of the candidate.
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
24.1312 -81.4139 15.6 -1 USNO-B1 14.97 12.00 13.32 *
24.1302 -81.4138 16.3 -1 GSC2.3 12.13 12.94 99.99
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 3.5" or brighter than 12 mag
-----------------
Entry 6 in the list of sources is a candidate afterglow for 1339848_g3572 with genie
ra=24.10509 (01:36:25.22) dec=-81.41682 (-81:25:00.6) +/- 0.7" mag=16.74+/-0.14
dist=79.1 REFID=1 major=6.8 minor=3.5 flag=3 (neighbor+blended)
*** The position of this source is inconsistent with the XRT position.
The position is 43.8 arc sec from the BAT position.
This source is near the edge of image (0.863)
Found 4 entries in star catalog(s) within 20.0" of the candidate.
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
24.1312 -81.4139 17.5 -1 USNO-B1 14.97 12.00 13.32 *
24.0995 -81.4138 11.3 -1 USNO-B1 20.33 20.10 20.20
24.0971 -81.4208 15.1 -1 USNO-B1 23.06 19.67 21.18
24.1302 -81.4138 17.4 -1 GSC2.3 12.13 12.94 99.99
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 5.25" or brighter than 12 mag
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
There are 36956.273 counts in the bkg source region of 6009.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 6.150 counts/pixel (5-sig UL in 4" is 20.36 mag) for 1339848_g3572
There are 1113.2362 counts in the xrt source region of 198.00000 pixels.
Rate in xrt region with 8 arcsec radius is 5.622 counts/pixel for 1339848_g3572
There are 6409.6763 counts in the xrt_bkg source region of 1090.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 5.880 counts/pixel (5-sig UL in 4" is 20.39 mag) for 1339848_g3572
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 20.92, XRT distances < 6",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 1339848_776070521_250805d12h53m18s089964usUT_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(24.2158,-81.4074,45")
fk5;-circle(24.1484682821598,-81.4112998178176,6")
fk5;-circle(24.2022413745109,-81.4070005767502,6")
fk5;-circle(24.1826938496142,-81.396556711467,6")
Region file: 1339848_776070521_250805d12h53m18s089964usUT_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(24.21208,-81.40175,8")
Region file: 1339848_776070521_250805d12h53m18s089964usUT_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(24.21208,-81.40175,25")
fk5;-circle(24.21208,-81.40175,15")
fk5;-circle(24.2022413745109,-81.4070005767502,6")
fk5;-circle(24.1826938496142,-81.396556711467,6")
image paragraph message for exposure 1 of trigger 1339848
------ Start for Possible Stand-alone Circular ----
In response to GRB250805 (Swift/BAT trigger 1339848) at 06:09:08 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 3536 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 0.092.
------- notes for trigger 1339848 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 250805d12h53m22s438258usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1339848
-expid=776070521 -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/1339848/
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 776070521.46558 or about 2025:218:07:08:36 UT
Found 459 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 10% of the srclist region. Found 171 sources in
srclist catalog. Found 116 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 11 source(s) in Genie image catalog. Found 7 Genie image source(s)
without IDs. There are 0 good candidate(s) in the Genie image catalog. Good
candidates must be brighter than 20.92 mag. Found 82 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
9% of the Genie image region.
Genie image analysis:
Found 36956.3 counts in the large background region of 6009.0 pixels or a rate
of 6.150 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 20.19 mag. for a
4-arcsec aperture.
Found 1113.2 counts in the XRT position region of 198.0 pixels or a rate of
5.622 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is -0.341 +/- 0.243 (1-sigma) cps. The
3-sigma UL at the XRT position is 0.728 cps or 19.95 mag. The closest srclist
source has ra= 24.1827 dec= -81.3965 mag=19.27 sep=24.71". The closest Genie
source has ra= 24.2022 dec= -81.4070 mag=19.75 sep=19.63".
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?
776070521 3536 WHITE srclist found no candidates.
776070521 3536 WHITE image found no candidates.
List afterglow candidates for other finding charts.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: -81.40175
GRB_ERROR: 6
GRB_RA: 24.21208
IMAGE_START_TIME: 07:08:36
MAGNITUDE: 19.9
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT