image overlap message for exposure 3 of trigger 1002103
uvot_overlap.pl vrs. 2010-12-20b fem started at 201027d09h22m57s715606usUT
The observation of trigger 1002103 started 2020-10-26T22:52:39.3
Examining file ./1002103_g904_uvot_sky_image.fits
The exposure ID is 625445559
The exposure time is 24.354 (seconds)
The filter is WHITE.
*** Warning -- found 4722 null pixels in the image.
The uvot region is centered at (196.7392,83.7740) with a roll angle of 165.3
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 (196.6640,83.7610) with a radius of 3.000 arc min
This is 0.922 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 (196.7466,83.7819) with a radius of 0.032 arc min
This is 0.478 arc min from the center of the uvot region
The area of the XRT error circle is 0.003 sq. arc min
The UVOT/XRT overlap is 0.003 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 3 of trigger 1002103
find_uvot_ag.pl vrs. 2017-02-17 fem started at 201027d09h23m17s929118usUT
Observation start time is 2020-10-26T22:52:39.3
Examining file ./1002103_g904_uvot_sources_image.fits
The exposure ID is 625445559
The exposure is 24.354 sec.
The bin size is 2 pixels
The filter is WHITE
There are 4 detected source(s) for 1002103_g904
*** WARNING -- Aspect solution FAILED.
Results need to be checked by, for example, blinking image with DS9.
Star catalogs centered at 196.7322 , 83.7812 with radius 2.25 arc min.
n_usno: 0 n_gsc: 0
*** WARNING -- no star catalog entries found.
-- this strongly suggests a problem with the catalogs.
-- cannot check for bright stars or nearby sources.
-- there is a high risk of false positives.
Bright star catalog has no entries brighter than 12 mag
Found 4 entries without IDs and 2 entries that are acceptable afterglow candidates for 1002103_g904.
Acceptable entries have no ID, XRT distances < 5", 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=196.6640 (13:06:39.36) DEC=83.7610 (+83:45:39.6)
XRT distances are from RA=196.7466 (13:06:59.19) DEC=83.7819 (+83:46:55.0)
*** WARNING 100 per cent of entries have no IDs.
-----------------
Entry 2 in the list of sources is a candidate afterglow for 1002103_g904 with genie
ra=196.87133 (13:07:29.12) dec=83.77815 (+83:46:41.4) +/- 1.2" mag=20.18+/-0.34
dist=50.5 REFID=3 major=0.8 minor=0.5 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 101.8 arc sec from the BAT position.
Found 0 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)
*** If XRT position is correct, then this is NOT the afterglow
-----------------
Entry 3 in the list of sources is a candidate afterglow for 1002103_g904 with genie
ra=196.67975 (13:06:43.14) dec=83.79553 (+83:47:43.9) +/- 0.8" mag=17.59+/-0.16
dist=55.4 REFID=4 major=1.1 minor=0.9 flag=1 (neighbor)
*** The position of this source is inconsistent with the XRT position.
The position is 124.4 arc sec from the BAT position.
This source is near the edge of image (0.876)
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 0 entries in star catalog(s) within 20" of the XRT position.
List UVOT sources within 20" of the XRT position:
There are 6287.2959 counts in the bkg source region of 6306.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 0.997 counts/pixel (5-sig UL in 4" is 19.38 mag) for 1002103_g904
There are 179.33160 counts in the xrt source region of 199.00000 pixels.
Rate in xrt region with 8 arcsec radius is 0.901 counts/pixel for 1002103_g904
There are 1204.7396 counts in the xrt_bkg source region of 1246.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 0.967 counts/pixel (5-sig UL in 4" is 19.39 mag) for 1002103_g904
There are 1 candidate(s) outside XRT error circle with mag < 19.37
Good candidates have no ID, acceptable profiles,
mag between 9.01 and 19.93, XRT distances < 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: 1002103_625445559_201027d09h23m17s929118usUT_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(196.7392,83.7740,45")
Region file: 1002103_625445559_201027d09h23m17s929118usUT_xrt.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(196.74662,83.78194,8")
Region file: 1002103_625445559_201027d09h23m17s929118usUT_xrt_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(196.74662,83.78194,25")
fk5;-circle(196.74662,83.78194,15")
image paragraph message for exposure 3 of trigger 1002103
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 GRB201026 (Swift/BAT trigger 1002103) at 22:37:34 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 24 seconds with the White filter
starting 879 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 0.18.
------- notes for trigger 1002103 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 201027d09h23m22s009363usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1002103
-expid=625445559 -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/1002103/
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 625445559.30728 or about 2020:300:22:52:34 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 4 source(s) in Genie image catalog. Found 4 Genie image source(s) without
IDs. There are 0 good candidate(s) in the Genie image catalog. Good candidates
must be brighter than 19.93 mag. Found 0 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 0% of the
Genie image region. The Genie image is INCOMPLETE with 4722 null pixels.
The closest Genie source has ra= 196.6356 dec= 83.7875 mag=13.64 sep=47.72".
This paragraph is only useful if the XRT position is grossly wrong. There are 1
candidate(s) in the image data with mag < 19.37 inside the BAT error region,
but outside the XRT error region. The brightest such source is at RA=196.67975
(13:06:43.14), DEC=83.79553 (+83:47:43.9) (J2000). It has a mag of 17.59. It is
124.4" from the BAT position.
****THIS SOURCE IS OUTSIDE XRT ERROR CIRCLE--USE WITH CAUTION***
UVOT took a finding chart exposure of 24 seconds with the White filter
starting 879 seconds after the BAT trigger. There is a candidate afterglow in
the rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 13:06:43.14 = 196.67975
DEC(J2000) = +83:47:43.9 = 83.79553
with a 90%-confidence error radius of about 0.77 arc sec. The estimated
magnitude is 17.59 with a 1-sigma error of about 0.16. No correction has been
made for the expected extinction corresponding to E(B-V) of 0.18.
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?
625445559 878 WHITE srclist data are not available.
625445559 878 WHITE image found no candidates.
List afterglow candidates for other finding charts.
625444767 86 WHITE srclist found no candidates.
625444767 86 WHITE image found no candidates.
625444980 299 U srclist found no candidates.
625444980 299 ? image data are not available.
------- Tokens for Quick GCN -------