image overlap message for exposure 2 of trigger 1340514
uvot_overlap.pl vrs. 2010-12-20b fem started at 250807d16h18m11s100282usUT
The observation of trigger 1340514 started 2025-08-07T10:52:07.8
Examining file ./1340514_g358_uvot_sky_image.fits
The exposure ID is 776256727
The exposure time is 249.924 (seconds)
The filter is U.
The uvot region is centered at (51.4567,-47.8856) with a roll angle of 76.2
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 (51.4200,-47.8770) with a radius of 3.000 arc min
This is 1.566 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 7.05 sq. arc min or 0.25 of the BAT error circle
The XRT error circle is centered at (51.4480,-47.8876) with a radius of 0.033 arc min
This is 0.372 arc min from the center of the uvot region
The area of the XRT error circle is 0.003 sq. arc min
The UVOT/XRT overlap is 0.003 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 2 of trigger 1340514
find_uvot_ag.pl vrs. 2023-04-25a fem started at 250807d16h18m23s625026usUT
Observation start time is 2025-08-07T10:52:07.8
Examining file ./1340514_g358_uvot_catalog_image.fits
The exposure ID is 776256727
The exposure is 249.924 sec.
The bin size is 2 pixels
The filter is U
There are 3 detected source(s) for 1340514_g358
Aspect correction adds 0.00184 degrees (0.441 sec of time = 4.44 arc sec) to RA
Aspect correction adds -0.00035 degrees (-1.27 arcsec) to Dec
Total aspect correction is 4.62 arcsec
Star catalogs centered at 51.4537 , -47.8886 with radius 2.65 arc min.
n_usno: 45 n_gsc: 31
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 11.6306
RA DEC Mag Color
bright star 0: 51.41453 (03:25:39.49) -47.86197 (-47:51:43.1) 11.63 GSC-F
Mean distance difference (CAT_DELTA) for 1 matched entries is 0.471" for 1340514_g358
Mean and std. dev of mag. difference (MAG_DELTA) are 1.226 and 0.000 for 1340514_g358
Found 2 entries without IDs and 2 entries that are acceptable afterglow candidates for 1340514_g358.
Acceptable entries have no ID, XRT distances < 5", 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=51.4200 (03:25:40.80) DEC=-47.8770 (-47:52:37.2)
XRT distances are from RA=51.4480 (03:25:47.51) DEC=-47.8876 (-47:53:15.4)
*** WARNING 66 per cent of entries have no IDs.
-----------------
Entry 0 in the list of sources is a candidate afterglow for 1340514_g358 with genie
ra=51.44818 (03:25:47.56) dec=-47.88778 (-47:53:16.0) +/- 0.8" mag=19.28+/-0.19
dist=0.8 REFID=3 major=1.2 minor=0.9 flag=0
Found 0 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)
uvot_check_outside found 12 of 12 good pixels
##### This source remains a candidate #####
It has no entries within 3.5" or brighter than 12 mag
-----------------
Entry 2 in the list of sources is a candidate afterglow for 1340514_g358 with genie
ra=51.48234 (03:25:55.76) dec=-47.86884 (-47:52:07.8) +/- 1.1" mag=20.45+/-0.29
dist=107.0 REFID=2 major=2.3 minor=1.4 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 153.4 arc sec from the BAT position.
This source is near the edge of image (0.926)
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
51.4818 -47.8682 2.6 -1 USNO-B1 18.77 16.35 17.43 *
51.4809 -47.8678 5.0 -1 GSC2.3 18.61 99.99 99.99 *
51.4817 -47.8682 2.8 -1 GSC2.3 17.15 17.50 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:
Unmatched source ra=51.44818 (03:25:47.56) dec=-47.88778 (-47:53:16.0) +/- 0.8" mag=19.28+/-0.19 dist=0.8 REFID=3 flag=0
There are 8404.0400 counts in the bkg source region of 6197.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 1.356 counts/pixel (5-sig UL in 4" is 20.30 mag) for 1340514_g358
There are 146.58888 counts in the src source region of 49.000000 pixels.
Rate in src region with 4 arcsec radius is 2.992 counts/pixel for 1340514_g358
There are 1715.1838 counts in the cand_src_bkg source region of 1249.0000 pixels.
Rate in cand_src_bkg region from 15 to 25 arcsec is 1.373 counts/pixel (5-sig UL in 4" is 20.29 mag) for 1340514_g358
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 20.85, XRT distances < 5",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 1 good candidate(s) found.
Region file: 1340514_776256727_250807d16h18m23s625026usUT_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(51.4567,-47.8856,45")
fk5;-circle(51.4481849435507,-47.8877752536847,6")
Region file: 1340514_776256727_250807d16h18m23s625026usUT_cand_src.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(51.4481849435507,-47.8877752536847,4")
Region file: 1340514_776256727_250807d16h18m23s625026usUT_cand_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(51.4481849435507,-47.8877752536847,25")
fk5;-circle(51.4481849435507,-47.8877752536847,15")
image paragraph message for exposure 2 of trigger 1340514
------ Start for Possible Stand-alone Circular ----
In response to GRB250807 (Swift/BAT trigger 1340514) at 10:46:08 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
323 seconds after the BAT trigger. There is a candidate afterglow in the
rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 03:25:47.56 = 51.44818
DEC(J2000) = -47:53:16.0 = -47.88778
with a 90%-confidence error radius of about 0.83 arc sec. This position is 0.8
arc sec. from the center of the XRT error circle. The estimated magnitude is
19.28 with a 1-sigma error of about 0.19. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.011.
------- notes for trigger 1340514 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 250807d16h18m27s888432usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1340514
-expid=776256727 -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/1340514/
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 776256727.76376 or about 2025:220:10:52:02 UT
Found 145 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 3% of the srclist region. Found 20 sources in
srclist catalog. Found 5 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 3 source(s) in Genie image catalog. 1 source(s) are within 10.0" of the
xrt position. Found 2 Genie image source(s) without IDs. There are 1 good
candidate(s) in the Genie image catalog. Good candidates must be brighter than
20.85 mag. Found 41 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 4% of the Genie image region. The
closest srclist source has ra= 51.4343 dec= -47.9070 mag=17.03 sep=77.22".
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?
776256727 322 U srclist found no candidates.
776256727 322 U 51.44818 -47.88778 19.28/20.9 0.8 image Yes
List afterglow candidates for other finding charts.
776256515 110 WHITE 51.44840 -47.88767 18.48/19.2 1.1 srclist Yes
776256515 110 WHITE 51.44829 -47.88782 17.98/21.0 1.1 image Yes
776257280 875 WHITE srclist found no candidates.
776257280 875 WHITE 51.44817 -47.88764 20.15/20.9 4.6 image Yes
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: -47.88778
GRB_ERROR: 0.83
GRB_RA: 51.44818
IMAGE_START_TIME: 10:52:02
MAGNITUDE: 19.28
MAG_ERROR: 0.19
MESSAGE_TYPE: ACK
SOURCE: XRT