image overlap message for exposure 1 of trigger 1516528
uvot_overlap.pl vrs. 2010-12-20b fem started at 261011d10h25m24s305494usUT
The observation of trigger 1516528 started 2026-10-10T20:30:55.2
Examining file ./1516528_g4427_uvot_sky_image.fits
The exposure ID is 813357055
The exposure time is 149.879 (seconds)
The filter is WHITE.
*** Warning -- no aspect solution was applied to the image.
consequently the calculated overlaps are questionable.
The uvot region is centered at (248.7448,26.6054) with a roll angle of 244.4
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 (248.7520,26.6090) with a radius of 3.000 arc min
This is 0.441 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 (248.7480,26.5822) with a radius of 0.050 arc min
This is 1.403 arc min from the center of the uvot region
The area of the XRT error circle is 0.008 sq. arc min
The UVOT/XRT overlap is 0.000 sq. arc min or 0.03 of the XRT error circle
image afterglow message for exposure 1 of trigger 1516528
find_uvot_ag.pl vrs. 2023-04-25a fem started at 261011d10h25m25s485703usUT
Observation start time is 2026-10-10T20:30:55.2
Examining file ./1516528_g4427_uvot_sources_image.fits
The exposure ID is 813357055
The exposure is 149.879 sec.
The bin size is 2 pixels
The filter is WHITE
There are 2 detected source(s) for 1516528_g4427
*** WARNING -- Aspect solution FAILED.
Results need to be checked by, for example, blinking image with DS9.
Star catalogs centered at 248.5769 , 22.8992 with radius 223.78 arc min.
n_usno: 5005 n_gsc: 0
*** WARNING -- bright star catalog has 18 entries brighter than 12 mag
The brightest has mag 7.7292
RA DEC Mag Color
bright star 0: 248.54525 (16:34:10.86) 22.89239 (+22:53:32.6) 11.61 USNO-V
bright star 1: 248.55933 (16:34:14.24) 22.84004 (+22:50:24.2) 11.51 USNO-V
bright star 2: 248.53648 (16:34:08.76) 22.98514 (+22:59:06.5) 11.69 USNO-V
bright star 3: 248.55293 (16:34:12.70) 22.78131 (+22:46:52.7) 10.71 USNO-V
bright star 4: 248.77070 (16:35:04.97) 22.84767 (+22:50:51.6) 11.96 USNO-V
bright star 5: 248.77211 (16:35:05.31) 22.82723 (+22:49:38.0) 9.32 USNO-V
bright star 6: 248.47516 (16:33:54.04) 22.71807 (+22:43:05.1) 11.64 USNO-V
bright star 7: 248.35100 (16:33:24.24) 22.84558 (+22:50:44.1) 11.84 USNO-V
bright star 8: 248.73690 (16:34:56.86) 22.72042 (+22:43:13.5) 11.27 USNO-V
bright star 9: 248.75026 (16:35:00.06) 22.72481 (+22:43:29.3) 10.02 USNO-V
bright star 10: 248.52393 (16:34:05.74) 23.13770 (+23:08:15.7) 10.44 USNO-V
bright star 11: 248.85562 (16:35:25.35) 22.83804 (+22:50:16.9) 9.94 USNO-V
bright star 12: 248.90508 (16:35:37.22) 22.93359 (+22:56:00.9) 11.63 USNO-V
bright star 13: 248.25678 (16:33:01.63) 22.79711 (+22:47:49.6) 8.79 USNO-R
bright star 14: 248.58084 (16:34:19.40) 23.21822 (+23:13:05.6) 11.04 USNO-V
bright star 15: 248.90232 (16:35:36.56) 22.78140 (+22:46:53.0) 10.23 USNO-V
bright star 16: 248.72377 (16:34:53.71) 23.21192 (+23:12:42.9) 10.97 USNO-V
bright star 17: 248.29099 (16:33:09.84) 23.11756 (+23:07:03.2) 7.73 USNO-V
Found 2 entries without IDs and 1 entries that are acceptable afterglow candidates for 1516528_g4427.
Acceptable entries have no ID, XRT distances < 7.5", 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=248.7520 (16:35:00.48) DEC=26.6090 (+26:36:32.4)
XRT distances are from RA=248.7480 (16:34:59.53) DEC=26.5822 (+26:34:55.8)
*** WARNING 100 per cent of entries have no IDs.
-----------------
Entry 1 in the list of sources is a candidate afterglow for 1516528_g4427 with genie
ra=248.75380 (16:35:00.91) dec=26.60848 (+26:36:30.5) +/- 0.8" mag=18.67+/-0.15
dist=96.5 REFID=2 major=0.7 minor=0.7 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 6.1 arc sec from the BAT position.
Found 0 entries in star catalog(s) within 20.0" of the candidate.
printing all entries
(Entries within 12 arc sec of a source list entry are considered a match)
*** If XRT position is correct, then this is NOT the afterglow
Found 0 entries in star catalog(s) within 20" of the XRT position.
List UVOT sources within 20" of the XRT position:
There are 1.3953438E+05 counts in the bkg source region of 6193.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 22.531 counts/pixel (5-sig UL in 4" is 19.66 mag) for 1516528_g4427
Do not compute counts in XRT region because position is too far from center.
There are 1 candidate(s) outside XRT error circle with mag < 19.65
Good candidates have no ID, acceptable profiles,
mag between 9.01 and 20.21, XRT distances < 7.5",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Results are questionable because aspect solution FAILED.
Region file: 1516528_813357055_261011d10h25m25s485703usUT_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(248.7448,26.6054,45")
fk5;-circle(248.75380399804,26.6084760438463,6")
image paragraph message for exposure 1 of trigger 1516528
THIS MESSAGE IS *NOT* READY FOR DISTRIBUTION.
MORE ANALYSIS IS REQUIRED TO DETERMINE WHETHER THERE IS AN AFTERGLOW CANDIDATE.
IMAGE PROBLEM: no aspect solution
SRCLIST PROBLEM: no srclist afterglow info
See notes for more details.
------ Start for Possible Stand-alone Circular ----
In response to GRB261010 (Swift/BAT trigger 1516528) at 19:17:07 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 4389 seconds after the BAT trigger. No credible afterglow candidate
has been found in the initial data products. The 2.7'x2.7' sub-image processing
FAILED because of no aspect solution. Results from the list of sources
generated on-board are not available at this time. No correction has been made
for extinction.
------- notes for trigger 1516528 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 261011d10h25m34s042934usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1516528
-expid=813357055 -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/1516528/
Links to data for all triggers can be found at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/
XRT position found for Genie image. BAT position found.
UVOT exposure began at MET 813357055.20398 or about 2026:283:20:30:50 UT
No information found about the number of stars in the star catalog for srclist
region.
THERE IS NO ASPECT SOLUTION for the image data.
Found 2 source(s) in Genie image catalog. Found 2 Genie image source(s) without
IDs. There are 0 good candidate(s) in the Genie image catalog. Good candidates
must be brighter than 20.21 mag. Found 5000 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 0% of the
Genie image region. The closest Genie source has ra= 248.7538 dec= 26.6085
mag=18.67 sep=96.50".
This paragraph is only useful if the XRT position is grossly wrong. There are 1
candidate(s) in the image data with mag < 19.65 inside the BAT error region,
but outside the XRT error region. The brightest such source is at RA=248.75380
(16:35:00.91), DEC=26.60848 (+26:36:30.5) (J2000). It has a mag of 18.67. It is
6.1" from the BAT position.
****THIS SOURCE IS OUTSIDE XRT ERROR CIRCLE--USE WITH CAUTION***
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 4389 seconds after the BAT trigger. There is a candidate afterglow in
the rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 16:35:00.91 = 248.75380
DEC(J2000) = +26:36:30.5 = 26.60848
with a 90%-confidence error radius of about 0.77 arc sec. The estimated
magnitude is 18.67 with a 1-sigma error of about 0.15. No correction has been
made for extinction.
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?
813357055 4389 WHITE srclist data are not available.
813357055 4389 WHITE image found no candidates.
List afterglow candidates for other finding charts.
------- Tokens for Quick GCN -------