image overlap message for exposure 1 of trigger 1186295
uvot_overlap.pl vrs. 2010-12-20b fem started at 230820d19h49m19s457037usUT
The observation of trigger 1186295 started 2023-08-20T19:40:18.6
Examining file 1186295_g209_uvot_sky_image.fits
The exposure ID is 714253218
The exposure time is 149.857 (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 (199.0191,-33.6815) with a roll angle of 295.9
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 (245.2630,-17.4180) with a radius of 3.000 arc min
This is 2506.602 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 (245.2985,-17.4372) with a radius of 0.078 arc min
This is 2507.787 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 1 of trigger 1186295
find_uvot_ag.pl vrs. 2023-04-25a fem started at 230820d19h49m20s621598usUT
Observation start time is 2023-08-20T19:40:18.6
Examining file 1186295_g209_uvot_sources_image.fits
The exposure ID is 714253218
The exposure is 149.857 sec.
The bin size is 2 pixels
The filter is WHITE
There are 18 detected source(s) for 1186295_g209
*** WARNING -- Aspect solution FAILED.
Results need to be checked by, for example, blinking image with DS9.
Star catalogs centered at 199.0274 , -33.6871 with radius 2.51 arc min.
n_usno: 81 n_gsc: 70
*** WARNING -- XRT position is outside star catalog search region.
Bright star catalog has no entries brighter than 12 mag
Found 18 entries without IDs and 0 entries that are acceptable afterglow candidates for 1186295_g209.
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=245.2630 (16:21:03.12) DEC=-17.4180 (-17:25:04.8)
XRT distances are from RA=245.2985 (16:21:11.64) DEC=-17.4372 (-17:26:13.9)
*** WARNING 100 per cent of entries have no IDs.
Found NO acceptable entries.
Unidentified entry closest to XRT position is no. 13:
ra=199.05355 dec=-33.68388 +/- 0.8" mag=18.71+/-0.15 dist=150372.0 REFID=14 flag=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 1.0120802E+05 counts in the bkg source region of 5825.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 17.375 counts/pixel (5-sig UL in 4" is 19.80 mag) for 1186295_g209
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 20.35, 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: 1186295_714253218_230820d19h49m20s621598usUT_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(199.0191,-33.6815,45")
fk5;-circle(199.027567677594,-33.6774379298202,6")
fk5;-circle(199.025614375232,-33.6822311349639,6")
fk5;-circle(199.029861982616,-33.6753098455711,6")
fk5;-circle(199.032050217279,-33.6738396671405,6")
fk5;-circle(199.029561762537,-33.6767508327926,6")
fk5;-circle(199.031038570857,-33.674634469621,6")
fk5;-circle(199.019445859869,-33.6828185654338,6")
image paragraph message for exposure 1 of trigger 1186295
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 GRB230820 (Swift/BAT trigger 1186295) at 19:36:48 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 178 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 0.278.
------- notes for trigger 1186295 ------
uvot_gcn_auto.pl vrs. 2023-03-28 fem at 230820d19h49m22s651934usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1186295
-expid=714253218 -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/1186295/
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 714253218.59422 or about 2023:232:19:40:13 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 18 source(s) in Genie image catalog. Found 18 Genie image source(s)
without IDs. There are 0 good candidate(s) in the Genie image catalog. Good
candidates must be brighter than 20.35 mag. Found 77 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
8% of the Genie image region. The XRT position was OUTSIDE the star catalog
search region. The closest Genie source has ra= 199.0536 dec= -33.6839
mag=18.71 sep=150372.05".
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?
714253218 178 WHITE srclist data are not available.
714253218 178 WHITE image found no candidates.
List afterglow candidates for other finding charts.
------- Tokens for Quick GCN -------