image overlap message for exposure 1 of trigger 1061687
uvot_overlap.pl vrs. 2010-12-20b fem started at 210726d21h25m06s143039usUT
The observation of trigger 1061687 started 2021-07-26T19:20:36.1
Examining file ./1061687_g92_uvot_sky_image.fits
The exposure ID is 649020036
The exposure time is 149.857 (seconds)
The filter is WHITE.
The uvot region is centered at (193.3356,19.1853) with a roll angle of 282.4
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 (193.3420,19.1850) with a radius of 3.000 arc min
This is 0.363 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 (193.2909,19.1903) with a radius of 0.040 arc min
This is 2.550 arc min from the center of the uvot region
The area of the XRT error circle is 0.005 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 1061687
find_uvot_ag.pl vrs. 2020-10-30 fem started at 210726d21h25m08s860088usUT
Observation start time is 2021-07-26T19:20:36.1
Examining file ./1061687_g92_uvot_sources_image.fits
The exposure ID is 649020036
The exposure is 149.857 sec.
The bin size is 2 pixels
The filter is WHITE
There are 2 detected source(s) for 1061687_g92
*** WARNING -- Aspect solution FAILED.
Results need to be checked by, for example, blinking image with DS9.
Star catalogs centered at 193.3397 , 19.1886 with radius 2.00 arc min.
n_usno: 30 n_gsc: 0
*** WARNING -- XRT position is outside star catalog search region.
Bright star catalog has no entries brighter than 12 mag
Found 2 entries without IDs and 2 entries that are acceptable afterglow candidates for 1061687_g92.
Acceptable entries have no ID, XRT distances < 6", 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=193.3420 (12:53:22.08) DEC=19.1850 (+19:11:06.0)
XRT distances are from RA=193.2909 (12:53:09.82) DEC=19.1903 (+19:11:25.1)
*** WARNING 100 per cent of entries have no IDs.
-----------------
Entry 0 in the list of sources is a candidate afterglow for 1061687_g92 with genie
ra=193.34019 (12:53:21.64) dec=19.18754 (+19:11:15.2) +/- 0.8" mag=19.09+/-0.16
dist=167.8 REFID=1 major=1.0 minor=0.9 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 11.0 arc sec from the BAT position.
Found 3 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
193.3390 19.1873 4.3 -1 USNO-B1 19.56 18.45 18.94 *
193.3381 19.1895 9.8 -1 USNO-B1 18.31 15.79 16.91 *
193.3424 19.1875 7.5 -1 USNO-B1 20.55 19.70 20.08 *
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 1 in the list of sources is a candidate afterglow for 1061687_g92 with genie
ra=193.33918 (12:53:21.40) dec=19.18973 (+19:11:23.0) +/- 0.8" mag=17.81+/-0.15
dist=164.1 REFID=2 major=1.1 minor=1.0 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 19.5 arc sec from the BAT position.
Found 3 entries in star catalog(s) within 20.0" of the candidate.
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
193.3390 19.1873 8.9 -1 USNO-B1 19.56 18.45 18.94 *
193.3381 19.1895 3.7 -1 USNO-B1 18.31 15.79 16.91 *
193.3424 19.1875 13.6 -1 USNO-B1 20.55 19.70 20.08
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 13.5" or brighter than 12 mag
Found 0 entries in star catalog(s) within 20" of the XRT position.
List UVOT sources within 20" of the XRT position:
There are 1.4635555E+05 counts in the bkg source region of 6118.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 23.922 counts/pixel (5-sig UL in 4" is 19.63 mag) for 1061687_g92
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 20.18, XRT distances < 6",
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: 1061687_649020036_210726d21h25m08s860088usUT_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(193.3356,19.1853,45")
fk5;-circle(193.340185200593,19.1875431366852,6")
fk5;-circle(193.339184296535,19.1897319436607,6")
image paragraph message for exposure 1 of trigger 1061687
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 GRB210726 (Swift/BAT trigger 1061687) at 19:19:03 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 64 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 0.020.
------- notes for trigger 1061687 ------
uvot_gcn_auto.pl vrs. 2020-10-27 fem at 210726d21h25m12s185000usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1061687
-expid=649020036 -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/1061687/
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 649020036.0689 or about 2021:207:19:20:31 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 20.18 mag. Found 26 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 4% of the
Genie image region. The XRT position was OUTSIDE the star catalog search
region. The closest Genie source has ra= 193.3392 dec= 19.1897 mag=17.81
sep=164.11".
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?
649020036 64 ? srclist data are not available.
649020036 64 WHITE image found no candidates.
List afterglow candidates for other finding charts.
649020247 275 U srclist found no candidates.
649020247 275 U image found no candidates.
649020848 876 WHITE srclist found no candidates.
649020848 876 WHITE image found no candidates.
------- Tokens for Quick GCN -------