image overlap message for exposure 1 of trigger 1351008
uvot_overlap.pl vrs. 2010-12-20b fem started at 250920d17h04m14s375569usUT
The observation of trigger 1351008 started 2025-09-20T08:48:45.9
Examining file ./1351008_g134_uvot_sky_image.fits
The exposure ID is 780050925
The exposure time is 149.879 (seconds)
The filter is WHITE.
The uvot region is centered at (187.3151,47.8297) with a roll angle of 192.9
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 (187.3370,47.8440) with a radius of 3.000 arc min
This is 1.231 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 (187.3169,47.8375) with a radius of 0.032 arc min
This is 0.474 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 1 of trigger 1351008
find_uvot_ag.pl vrs. 2023-04-25a fem started at 250920d17h04m17s206825usUT
Observation start time is 2025-09-20T08:48:45.9
Examining file ./1351008_g134_uvot_catalog_image.fits
The exposure ID is 780050925
The exposure is 149.879 sec.
The bin size is 2 pixels
The filter is WHITE
There are 2 detected source(s) for 1351008_g134
Aspect correction adds -0.00097 degrees (-0.232 sec of time = -2.33 arc sec) to RA
Aspect correction adds -0.00014 degrees (-0.52 arcsec) to Dec
Total aspect correction is 2.39 arcsec
Star catalogs centered at 187.3154 , 47.8406 with radius 2.26 arc min.
n_usno: 61 n_gsc: 25
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 1 matched entries is 0.916" for 1351008_g134
Mean and std. dev of mag. difference (MAG_DELTA) are 0.497 and 0.000 for 1351008_g134
Found 1 entries without IDs and 1 entries that are acceptable afterglow candidates for 1351008_g134.
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.
Magnitude criteria will be applied later.
BAT distances are from RA=187.3370 (12:29:20.88) DEC=47.8440 (+47:50:38.4)
XRT distances are from RA=187.3169 (12:29:16.05) DEC=47.8375 (+47:50:15.0)
*** WARNING 50 per cent of entries have no IDs.
-----------------
Entry 0 in the list of sources is a candidate afterglow for 1351008_g134 with genie
ra=187.31697 (12:29:16.07) dec=47.83734 (+47:50:14.4) +/- 0.7" mag=13.75+/-0.14
dist=0.6 REFID=1 major=0.8 minor=0.7 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
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=187.31697 (12:29:16.07) dec=47.83734 (+47:50:14.4) +/- 0.7" mag=13.75+/-0.14 dist=0.6 REFID=1 flag=0
There are 1.6355583E+05 counts in the bkg source region of 6197.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 26.393 counts/pixel (5-sig UL in 4" is 19.57 mag) for 1351008_g134
There are 12682.243 counts in the src source region of 50.000000 pixels.
Rate in src region with 4 arcsec radius is 253.645 counts/pixel for 1351008_g134
There are 34957.219 counts in the cand_src_bkg source region of 1250.0000 pixels.
Rate in cand_src_bkg region from 15 to 25 arcsec is 27.966 counts/pixel (5-sig UL in 4" is 19.54 mag) for 1351008_g134
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 20.13, 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: 1351008_780050925_250920d17h04m17s206825usUT_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(187.3151,47.8297,45")
fk5;-circle(187.316973977393,47.8373374240047,6")
Region file: 1351008_780050925_250920d17h04m17s206825usUT_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(187.316973977393,47.8373374240047,4")
Region file: 1351008_780050925_250920d17h04m17s206825usUT_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(187.316973977393,47.8373374240047,25")
fk5;-circle(187.316973977393,47.8373374240047,15")
image paragraph message for exposure 1 of trigger 1351008
------ Start for Possible Stand-alone Circular ----
In response to GRB250920 (Swift/BAT trigger 1351008) at 08:46:30 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 98 seconds after the BAT trigger. There is a candidate afterglow in
the rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 12:29:16.07 = 187.31697
DEC(J2000) = +47:50:14.4 = 47.83734
with a 90%-confidence error radius of about 0.74 arc sec. This position is 0.6
arc sec. from the center of the XRT error circle. The estimated magnitude is
13.75 with a 1-sigma error of about 0.14. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.011.
------- notes for trigger 1351008 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 250920d17h04m21s887259usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1351008
-expid=780050925 -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/1351008/
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 780050925.88142 or about 2025:264:08:48:40 UT
Found 237 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 6% of the srclist region. Found 11 sources in
srclist catalog. Found 3 srclist source(s) without IDs. There are 1 good
candidate(s) in the srclist catalog. Good candidates must be brighter than
19.22 mag.
Found 2 source(s) in Genie image catalog. 1 source(s) are within 10.0" of the
xrt position. Found 1 Genie image source(s) without IDs. There are 1 good
candidate(s) in the Genie image catalog. Good candidates must be brighter than
20.13 mag. Found 57 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 7% of the Genie image region.
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?
780050925 98 WHITE 187.31690 47.83727 13.86/19.2 0.8 srclist Yes
780050925 98 WHITE 187.31697 47.83734 13.75/20.1 0.6 image Yes
List afterglow candidates for other finding charts.
780051138 311 U 187.31707 47.83733 14.36/17.8 1.4 srclist Yes
780051138 311 U 187.31701 47.83737 13.32/19.6 1.5 image Yes
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: 47.83734
GRB_ERROR: 0.74
GRB_RA: 187.31697
IMAGE_START_TIME: 08:48:40
MAGNITUDE: 13.75
MAG_ERROR: 0.14
MESSAGE_TYPE: ACK
SOURCE: XRT