image overlap message for exposure 1 of trigger 1348587
uvot_overlap.pl vrs. 2010-12-20b fem started at 250911d06h49m35s284998usUT
The observation of trigger 1348587 started 2025-09-11T02:25:48.4
Examining file ./1348587_g3481_uvot_sky_image.fits
The exposure ID is 779250348
The exposure time is 149.857 (seconds)
The filter is WHITE.
The uvot region is centered at (263.7551,-16.8440) with a roll angle of 273.1
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 (263.7620,-16.8440) with a radius of 3.000 arc min
This is 0.398 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 (263.7501,-16.8542) with a radius of 0.033 arc min
This is 0.672 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 1348587
find_uvot_ag.pl vrs. 2023-04-25a fem started at 250911d06h49m42s189866usUT
Observation start time is 2025-09-11T02:25:48.4
Examining file ./1348587_g3481_uvot_catalog_image.fits
The exposure ID is 779250348
The exposure is 149.857 sec.
The bin size is 2 pixels
The filter is WHITE
There are 51 detected source(s) for 1348587_g3481
Aspect correction adds -0.00029 degrees (-0.070 sec of time = -1.01 arc sec) to RA
Aspect correction adds 0.00033 degrees ( 1.19 arcsec) to Dec
Total aspect correction is 1.56 arcsec
Star catalogs centered at 263.7587 , -16.8446 with radius 2.62 arc min.
n_usno: 1467 n_gsc: 960
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 11.68072
RA DEC Mag Color
bright star 0: 263.79077 (17:35:09.79) -16.85218 (-16:51:07.9) 11.68 USNO-V
Mean distance difference (CAT_DELTA) for 58 matched entries is 0.655" for 1348587_g3481
Mean and std. dev of mag. difference (MAG_DELTA) are 2.167 and 0.509 for 1348587_g3481
Found 1 entries without IDs and 1 entries that are acceptable afterglow candidates for 1348587_g3481.
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=263.7620 (17:35:02.88) DEC=-16.8440 (-16:50:38.4)
XRT distances are from RA=263.7501 (17:35:00.03) DEC=-16.8542 (-16:51:15.0)
-----------------
Entry 0 in the list of sources is a candidate afterglow for 1348587_g3481 with genie
ra=263.75764 (17:35:01.83) dec=-16.84184 (-16:50:30.6) +/- 0.7" mag=18.80+/-0.16
dist=51.4 REFID=25 major=0.7 minor=0.7 flag=3 (neighbor+blended)
*** The position of this source is inconsistent with the XRT position.
The position is 16.9 arc sec from the BAT position.
Found 42 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
263.7597 -16.8439 10.3 -1 USNO-B1 16.00 14.26 15.03
263.7602 -16.8433 10.4 -1 USNO-B1 16.75 16.16 16.42
263.7606 -16.8432 11.3 -1 USNO-B1 99.99 17.94 99.99
263.7588 -16.8470 19.0 -1 USNO-B1 18.60 17.68 18.09
263.7567 -16.8426 4.1 -1 USNO-B1 16.70 15.36 15.95
263.7562 -16.8460 15.9 -1 USNO-B1 20.08 16.34 18.00
263.7571 -16.8421 2.1 -1 USNO-B1 19.60 14.29 16.65 *
263.7565 -16.8466 17.5 -1 USNO-B1 20.37 19.58 19.93
263.7556 -16.8455 14.8 -1 USNO-B1 19.19 17.62 18.32
263.7569 -16.8420 2.6 -1 USNO-B1 21.55 14.40 17.57 *
263.7543 -16.8434 12.8 -1 USNO-B1 20.01 19.10 19.50
263.7621 -16.8415 15.5 -1 USNO-B1 18.45 17.79 18.08
263.7625 -16.8415 16.7 -1 USNO-B1 18.40 16.70 17.45
263.7615 -16.8404 14.4 -1 USNO-B1 19.58 17.65 18.51
263.7595 -16.8392 11.3 -1 USNO-B1 19.92 18.39 19.07
263.7582 -16.8391 10.0 -1 USNO-B1 20.08 15.45 17.51
263.7541 -16.8413 12.3 -1 USNO-B1 17.42 16.06 16.66
263.7587 -16.8388 11.4 -1 USNO-B1 99.99 17.39 99.99
263.7632 -16.8402 19.9 -1 USNO-B1 19.87 17.36 18.47
263.7550 -16.8389 13.9 -1 USNO-B1 18.46 16.87 17.58
263.7538 -16.8393 16.3 -1 USNO-B1 15.88 14.27 14.98
263.7593 -16.8375 16.7 -1 USNO-B1 20.12 22.61 21.50
263.7579 -16.8372 16.8 -1 USNO-B1 21.46 22.17 21.85
263.7557 -16.8374 17.4 -1 USNO-B1 19.80 18.95 19.33
263.7594 -16.8442 10.5 -1 GSC2.3 16.90 17.03 17.69
263.7602 -16.8431 9.9 -1 GSC2.3 16.97 17.55 99.99
263.7589 -16.8470 18.9 -1 GSC2.3 18.08 19.47 99.99
263.7568 -16.8425 3.8 -1 GSC2.3 14.99 17.15 15.89
263.7557 -16.8454 14.5 -1 GSC2.3 17.89 19.57 17.95
263.7563 -16.8465 17.5 -1 GSC2.3 99.99 20.94 99.99
263.7573 -16.8418 1.2 -1 GSC2.3 99.99 18.34 99.99 *
263.7542 -16.8434 13.1 -1 GSC2.3 18.90 20.45 99.99
263.7622 -16.8416 15.9 -1 GSC2.3 17.96 18.44 99.99
263.7614 -16.8403 14.1 -1 GSC2.3 18.65 20.42 99.99
263.7592 -16.8393 10.6 -1 GSC2.3 18.10 20.67 99.99
263.7541 -16.8413 12.3 -1 GSC2.3 16.94 18.28 99.99
263.7579 -16.8391 9.8 -1 GSC2.3 99.99 20.93 99.99
263.7632 -16.8403 20.0 -1 GSC2.3 18.69 20.64 99.99
263.7552 -16.8388 14.0 -1 GSC2.3 99.99 20.28 99.99
263.7592 -16.8375 16.7 -1 GSC2.3 19.00 21.13 99.99
263.7537 -16.8392 16.5 -1 GSC2.3 14.62 16.41 15.08
263.7558 -16.8374 17.1 -1 GSC2.3 18.80 20.60 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
Found 7 entries in star catalog(s) within 10" of the XRT position.
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
263.7522 -16.8527 9.0 -1 USNO-B1 18.87 17.79 18.27
263.7516 -16.8540 5.1 -1 USNO-B1 20.38 18.43 19.30
263.7524 -16.8547 8.2 -1 USNO-B1 21.14 18.52 19.68
263.7508 -16.8558 6.2 -1 USNO-B1 18.81 17.61 18.14
263.7522 -16.8525 9.3 -1 GSC2.3 99.99 19.35 99.99
263.7514 -16.8541 4.5 -1 GSC2.3 99.99 21.32 99.99
263.7508 -16.8558 6.2 -1 GSC2.3 18.47 19.78 99.99
The closest star is 4.54" away.
List UVOT sources within 10" of the XRT position:
There are 1.6325622E+05 counts in the bkg source region of 5474.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 29.824 counts/pixel (5-sig UL in 4" is 19.51 mag) for 1348587_g3481
There are 5897.6313 counts in the xrt source region of 198.00000 pixels.
Rate in xrt region with 8 arcsec radius is 29.786 counts/pixel for 1348587_g3481
There are 24664.699 counts in the xrt_bkg source region of 860.00000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 28.680 counts/pixel (5-sig UL in 4" is 19.53 mag) for 1348587_g3481
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 20.06, XRT distances < 5",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 1348587_779250348_250911d06h49m42s189866usUT_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(263.7551,-16.8440,45")
fk5;-circle(263.757642358676,-16.841842504638,6")
fk5;-circle(263.756464498603,-16.8428444024766,6")
fk5;-circle(263.754246705066,-16.8414591808462,6")
fk5;-circle(263.753783911758,-16.8392522220512,6")
fk5;-circle(263.765654852603,-16.8351527064957,6")
fk5;-circle(263.757236777942,-16.8534866687454,6")
fk5;-circle(263.755241918711,-16.852970865568,6")
fk5;-circle(263.748089559334,-16.8509082034376,6")
fk5;-circle(263.743924917058,-16.8479337636428,6")
fk5;-circle(263.746243623966,-16.8537551291186,6")
fk5;-circle(263.74128787288,-16.8420093882809,6")
Region file: 1348587_779250348_250911d06h49m42s189866usUT_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(263.75012,-16.85417,8")
Region file: 1348587_779250348_250911d06h49m42s189866usUT_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(263.75012,-16.85417,25")
fk5;-circle(263.75012,-16.85417,15")
fk5;-circle(263.757236777942,-16.8534866687454,6")
fk5;-circle(263.755241918711,-16.852970865568,6")
fk5;-circle(263.748089559334,-16.8509082034376,6")
fk5;-circle(263.751758625703,-16.8580630791889,6")
fk5;-circle(263.743924917058,-16.8479337636428,6")
fk5;-circle(263.746243623966,-16.8537551291186,6")
fk5;-circle(263.74533629854,-16.8569080512702,6")
fk5;-circle(263.743007916271,-16.8569425507959,6")
image paragraph message for exposure 1 of trigger 1348587
THIS MESSAGE IS *NOT* READY FOR DISTRIBUTION.
MORE ANALYSIS IS REQUIRED TO DETERMINE WHETHER THERE IS AN AFTERGLOW CANDIDATE.
IMAGE PROBLEM: high density of stars
SRCLIST PROBLEM: high density of stars, srclist filled telemetry buffer
See notes for more details.
------ Start for Possible Stand-alone Circular ----
In response to GRB250911 (Swift/BAT trigger 1348587) at 01:27:46 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 3445 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. Because of the density of catalogued stars,
further analysis is required to report an upper limit for any afterglow in the
sub-image. The 8'x8' region for the list of sources generated on-board covers
100% of the XRT error circle. Because of the density of catalogued stars,
further analysis is required to report an upper limit for any afterglow in the
region. No correction has been made for the expected extinction corresponding
to E(B-V) of 0.486.
------- notes for trigger 1348587 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 250911d06h49m48s488631usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1348587
-expid=779250348 -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/1348587/
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 779250348.38794 or about 2025:255:02:25:43 UT
Since the srclist star catalog filled its buffer, the sensitivity for an
afterglow may be REDUCED. The stars will eliminate afterglows from about 93%
or more of the srclist region. Found 190 sources in srclist catalog. WARNING --
srclist catalog buffer filled. Found 17 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 51 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 20.06 mag. Found 1463 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
148% of the Genie image region.
Genie image analysis:
Found 163256.2 counts in the large background region of 5474.0 pixels or a rate
of 29.824 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 19.33 mag. for a
4-arcsec aperture.
Found 5897.6 counts in the XRT position region of 198.0 pixels or a rate of
29.786 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 1.460 +/- 0.566 (1-sigma) cps or
19.19 mag and a range from 18.84 to 19.73 mag. The 3-sigma UL at the XRT
position is 3.158 cps or 18.36 mag. The number of srclist sources filled the
available telemetry. The weakest source detected was 18.44 mag. The closest
srclist source has ra= 263.7518 dec= -16.8581 mag=16.36 sep=15.25". The closest
Genie source has ra= 263.7462 dec= -16.8538 mag=18.06 sep=13.44".
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?
779250348 3445 WHITE srclist found no candidates.
779250348 3445 WHITE image found no candidates.
List afterglow candidates for other finding charts.
------- Tokens for Quick GCN -------