image overlap message for exposure 3 of trigger 1071769
uvot_overlap.pl vrs. 2010-12-20b fem started at 210903d14h33m30s118902usUT
The observation of trigger 1071769 started 2021-09-03T14:26:15.8
Examining file 1071769_g882_uvot_sky_image.fits
The exposure ID is 652371975
The exposure time is 149.857 (seconds)
The filter is WHITE.
*** Warning -- found 3598 null pixels in the image.
The uvot region is centered at (299.5555,34.9537) with a roll angle of 307.4
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 (307.9670,37.3980) with a radius of 3.000 arc min
This is 438.882 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 (307.9671,37.4094) with a radius of 0.080 arc min
This is 439.115 arc min from the center of the uvot region
The area of the XRT error circle is 0.020 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 3 of trigger 1071769
find_uvot_ag.pl vrs. 2020-10-30 fem started at 210903d14h33m31s650343usUT
Observation start time is 2021-09-03T14:26:15.8
Examining file 1071769_g882_uvot_sources_image.fits
The exposure ID is 652371975
The exposure is 149.857 sec.
The bin size is 2 pixels
The filter is WHITE
There are 8 detected source(s) for 1071769_g882
*** WARNING -- Aspect solution FAILED.
Results need to be checked by, for example, blinking image with DS9.
Star catalogs centered at 299.5564 , 34.9597 with radius 2.13 arc min.
n_usno: 187 n_gsc: 0
*** WARNING -- XRT position is outside star catalog search region.
Bright star catalog has no entries brighter than 12 mag
Found 8 entries without IDs and 0 entries that are acceptable afterglow candidates for 1071769_g882.
Acceptable entries have no ID, XRT distances < 12", 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=307.9670 (20:31:52.08) DEC=37.3980 (+37:23:52.8)
XRT distances are from RA=307.9671 (20:31:52.10) DEC=37.4094 (+37:24:33.8)
*** WARNING 100 per cent of entries have no IDs.
Found NO acceptable entries.
Unidentified entry closest to XRT position is no. 2:
ra=299.56472 dec= 34.97290 +/- 0.7" mag=15.18+/-0.14 dist=26292.6 REFID=3 flag=18
Found 0 entries in star catalog(s) within 20" of the XRT position.
List UVOT sources within 20" of the XRT position:
There are 59098.844 counts in the bkg source region of 5862.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 10.082 counts/pixel (5-sig UL in 4" is 20.10 mag) for 1071769_g882
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 20.65, XRT distances < 12",
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: 1071769_652371975_210903d14h33m31s650343usUT_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(299.5555,34.9537,45")
fk5;-circle(299.558505623058,34.9447479795923,6")
fk5;-circle(299.559376829189,34.9602295201449,6")
fk5;-circle(299.554829837056,34.9565311885492,6")
fk5;-circle(299.547277752025,34.9501752273349,6")
image paragraph message for exposure 3 of trigger 1071769
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.
WARNING -- because of the LARGE EXTINCTION, results should be used cautiously.
------ Start for Possible Stand-alone Circular ----
In response to GRB210903 (Swift/BAT trigger 1071769) at 14:11:32 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 855 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 large, but uncertain, extinction expected.
------- notes for trigger 1071769 ------
uvot_gcn_auto.pl vrs. 2020-10-27 fem at 210903d14h33m33s620518usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1071769
-expid=652371975 -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/1071769/
Links to data for all triggers can be found at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/
Unreliable extinction found for bat position. Unreliable extinction found for
xrt position. XRT position found for Genie image. BAT position found.
UVOT exposure began at MET 652371975.83394 or about 2021:246:14:26:10 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 8 source(s) in Genie image catalog. Found 8 Genie image source(s) without
IDs. There are 0 good candidate(s) in the Genie image catalog. Good candidates
must be brighter than 20.65 mag. Found 183 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 28% of the
Genie image region. The XRT position was OUTSIDE the star catalog search
region. The Genie image is INCOMPLETE with 3598 null pixels.
The closest Genie source has ra= 299.5647 dec= 34.9729 mag=15.18
sep=26292.64".
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?
652371975 855 WHITE srclist data are not available.
652371975 855 WHITE image found no candidates.
List afterglow candidates for other finding charts.
652371239 119 ? srclist data are not available.
652371239 119 WHITE image found no candidates.
652371397 277 ? srclist data are not available.
652371397 277 U image found no candidates.
------- Tokens for Quick GCN -------