image overlap message for exposure 2 of trigger 1192490
uvot_overlap.pl vrs. 2010-12-20b fem started at 230918d04h36m31s476889usUT
The observation of trigger 1192490 started 2023-09-18T03:52:10.0
Examining file 1192490_g353_uvot_sky_image.fits
The exposure ID is 716701929
The exposure time is 25.823 (seconds)
The filter is U.
*** Warning -- no aspect solution was applied to the image.
consequently the calculated overlaps are questionable.
*** Warning -- found 9176 null pixels in the image.
The uvot region is centered at (275.9205,-35.7718) with a roll angle of 259.5
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 (261.9050,-15.1420) with a radius of 3.000 arc min
This is 1413.377 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 0.00 sq. arc min or 0.00 of the BAT error circle
The XRT error circle is centered at (261.8769,-15.1236) with a radius of 0.078 arc min
This is 1415.004 arc min from the center of the uvot region
The area of the XRT error circle is 0.019 sq. arc min
The UVOT/XRT overlap is 0.000 sq. arc min or 0.00 of the XRT error circle
image afterglow message for exposure 2 of trigger 1192490
find_uvot_ag.pl vrs. 2023-04-25a fem started at 230918d04h36m33s062717usUT
Observation start time is 2023-09-18T03:52:10.0
Examining file 1192490_g353_uvot_sources_image.fits
The exposure ID is 716701929
The exposure is 25.823 sec.
The bin size is 2 pixels
The filter is U
There are 0 detected source(s) for 1192490_g353
*** WARNING -- Aspect solution FAILED.
Results need to be checked by, for example, blinking image with DS9.
Star catalogs centered at 275.9625 , -35.7796 with radius 2.00 arc min.
n_usno: 555 n_gsc: 239
*** WARNING -- XRT position is outside star catalog search region.
Bright star catalog has no entries brighter than 12 mag
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 1192490_g353.
Acceptable entries have no ID, XRT distances < 11.75", 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=261.9050 (17:27:37.20) DEC=-15.1420 (-15:08:31.2)
XRT distances are from RA=261.8769 (17:27:30.46) DEC=-15.1236 (-15:07:25.0)
Found 0 entries in star catalog(s) within 20" of the XRT position.
List UVOT sources within 20" of the XRT position:
There are 4045.1599 counts in the bkg source region of 5135.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 0.788 counts/pixel (5-sig UL in 4" is 18.13 mag) for 1192490_g353
Do not compute counts in XRT region because position is too far from center.
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 18.68, XRT distances < 11.75",
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: 1192490_716701929_230918d04h36m33s062717usUT_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(275.9205,-35.7718,45")
image paragraph message for exposure 2 of trigger 1192490
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 GRB230918 (Swift/BAT trigger 1192490) at 03:46:15 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 26 seconds with the U filter starting
321 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 the
expected extinction corresponding to E(B-V) of 0.399.
------- notes for trigger 1192490 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 230918d04h36m34s436110usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1192490
-expid=716701929 -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/1192490/
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 716701929.9565 or about 2023:261:03:52:04 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 0 source(s) in Genie image catalog. Found 0 Genie image source(s) without
IDs. There are 0 good candidate(s) in the Genie image catalog. Good candidates
must be brighter than 18.68 mag. Found 551 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 95% of the
Genie image region. The XRT position was OUTSIDE the star catalog search
region. The Genie image is INCOMPLETE with 9176 null pixels.
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?
716701929 321 U srclist data are not available.
716701929 321 U image found no candidates.
List afterglow candidates for other finding charts.
716701717 109 ? srclist data are not available.
716701717 109 WHITE image found no candidates.
------- Tokens for Quick GCN -------