image overlap message for exposure 2 of trigger 1145959
uvot_overlap.pl vrs. 2010-12-20b fem started at 221227d03h24m48s653132usUT
The observation of trigger 1145959 started 2022-12-26T22:46:38.3
Examining file ./1145959_g317_uvot_sky_image.fits
The exposure ID is 693787598
The exposure time is 173.725 (seconds)
The filter is U.
The uvot region is centered at (22.9134,-41.5574) with a roll angle of 241.4
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 (22.9170,-41.5540) with a radius of 3.000 arc min
This is 0.262 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 (22.9097,-41.5267) with a radius of 0.043 arc min
This is 1.853 arc min from the center of the uvot region
The area of the XRT error circle is 0.006 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 1145959
find_uvot_ag.pl vrs. 2020-10-30 fem started at 221227d03h24m59s468543usUT
Observation start time is 2022-12-26T22:46:38.3
Examining file ./1145959_g317_uvot_sources_image.fits
The exposure ID is 693787598
The exposure is 173.725 sec.
The bin size is 2 pixels
The filter is U
There are 3 detected source(s) for 1145959_g317
*** WARNING -- Aspect solution FAILED.
Results need to be checked by, for example, blinking image with DS9.
Star catalogs centered at 22.9078 , -41.5528 with radius 2.11 arc min.
n_usno: 62 n_gsc: 0
*** WARNING -- bright star catalog has 2 entries brighter than 12 mag
The brightest has mag 11.66
RA DEC Mag Color
bright star 0: 22.89454 (01:31:34.69) -41.53225 (-41:31:56.1) 11.66 USNO-B
bright star 1: 22.89404 (01:31:34.57) -41.53055 (-41:31:50.0) 11.75 USNO-B
Found 3 entries without IDs and 2 entries that are acceptable afterglow candidates for 1145959_g317.
Acceptable entries have no ID, XRT distances < 6.5", and are > 0.8*(80 - 10*(mag-6))" from any bright star
from any bright star and >21.6" from other rejected sources.
1 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=22.9170 (01:31:40.08) DEC=-41.5540 (-41:33:14.4)
XRT distances are from RA=22.9097 (01:31:38.33) DEC=-41.5267 (-41:31:36.1)
*** WARNING 100 per cent of entries have no IDs.
-----------------
Entry 0 in the list of sources is a candidate afterglow for 1145959_g317 with genie
ra=22.91121 (01:31:38.69) dec=-41.56902 (-41:34:08.5) +/- 0.9" mag=19.34+/-0.21
dist=152.4 REFID=1 major=1.3 minor=1.0 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 56.3 arc sec from the BAT position.
Found 2 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)
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
22.9041 -41.5674 19.9 -1 USNO-B1 18.32 24.19 21.58
22.9100 -41.5696 3.9 -1 USNO-B1 19.46 16.77 17.97 *
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 13.5" or brighter than 12 mag
-----------------
Entry 2 in the list of sources is a candidate afterglow for 1145959_g317 with genie
ra=22.91965 (01:31:40.71) dec=-41.56189 (-41:33:42.8) +/- 1.5" mag=20.87+/-0.46
dist=129.5 REFID=3 major=1.0 minor=0.9 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 29.3 arc sec from the BAT position.
Found 0 entries in star catalog(s) within 20.0" of the candidate.
*** If XRT position is correct, then this is NOT the afterglow
Found 2 entries in star catalog(s) within 20" of the XRT position.
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
22.9141 -41.5304 17.9 -1 USNO-B1 99.99 21.59 99.99
22.9125 -41.5290 11.2 -1 USNO-B1 16.76 20.00 18.56
The closest star is 11.16" away.
List UVOT sources within 20" of the XRT position:
There are 6919.9600 counts in the bkg source region of 6115.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 1.132 counts/pixel (5-sig UL in 4" is 20.00 mag) for 1145959_g317
Do not compute counts in XRT region because position is too far from center.
Good candidates have no ID, acceptable profiles,
mag between 9.01 and 20.56, XRT distances < 6.5",
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: 1145959_693787598_221227d03h24m59s468543usUT_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(22.9134,-41.5574,45")
fk5;-circle(22.9112078867852,-41.569015731088,6")
fk5;-circle(22.9196454675175,-41.5618903172654,6")
image paragraph message for exposure 2 of trigger 1145959
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 GRB221226 (Swift/BAT trigger 1145959) at 22:41:20 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 174 seconds with the U filter starting
287 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. Data 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 0.017.
------- notes for trigger 1145959 ------
uvot_gcn_auto.pl vrs. 2020-10-27 fem at 221227d03h25m04s811088usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1145959
-expid=693787598 -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/1145959/
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 693787598.25514 or about 2022:360:22:46:33 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 3 source(s) in Genie image catalog. Found 3 Genie image source(s) without
IDs. There are 0 good candidate(s) in the Genie image catalog. Good candidates
must be brighter than 20.56 mag. Found 58 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 9% of the
Genie image region. The closest Genie source has ra= 22.8960 dec= -41.5366
mag=17.75 sep=51.37".
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?
693787598 287 ? srclist data are not available.
693787598 287 U image found no candidates.
List afterglow candidates for other finding charts.
693787386 75 WHITE srclist found no candidates.
693787386 75 WHITE image found no candidates.
------- Tokens for Quick GCN -------