srclist overlap message for exposure 2 of trigger 1110821
uvot_overlap.pl vrs. 2010-12-20b fem started at 220618d13h18m14s211916usUT
The observation of trigger 1110821 started 2022-06-18T09:16:08.6
Examining file ./1110821_g338_uvot_sky_srclist.fits
The exposure ID is 677236568
The exposure time is undefined.
The filter is U.
The uvot region is centered at (38.9902,55.2151) with a roll angle of 112.3
It is square with sides of 8.03 arc min. for an area of 64.51 sq arc min
The BAT error circle is centered at (38.9660,55.2140) with a radius of 3.000 arc min
This is 0.831 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 28.27 sq. arc min or 1.00 of the BAT error circle
The XRT error circle is centered at (38.9860,55.2157) with a radius of 0.037 arc min
This is 0.146 arc min from the center of the uvot region
The area of the XRT error circle is 0.004 sq. arc min
The UVOT/XRT overlap is 0.004 sq. arc min or 1.00 of the XRT error circle
srclist afterglow message for exposure 2 of trigger 1110821
find_uvot_ag.pl vrs. 2020-10-30 fem started at 220618d13h18m28s151325usUT
Observation start time is 2022-06-18T09:16:08.6
Examining file ./1110821_g338_uvot_catalog_srclist.fits
The exposure ID is 677236568
The exposure is 249.935 sec.
The bin size is 2 pixels
The filter is U
There are 66 detected source(s) for 1110821_g338
Aspect correction adds 0.00147 degrees (0.352 sec of time = 3.02 arc sec) to RA
Aspect correction adds -0.00047 degrees (-1.70 arcsec) to Dec
Total aspect correction is 3.46 arcsec
Star catalogs centered at 38.9828 , 55.2165 with radius 5.70 arc min.
n_usno: 1271 n_gsc: 0
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 11.73414
RA DEC Mag Color
bright star 0: 38.88636 (02:35:32.73) 55.17050 (+55:10:13.8) 11.73 USNO-V
Mean distance difference (CAT_DELTA) for 63 matched entries is 0.813" for 1110821_g338
Mean and std. dev of mag. difference (MAG_DELTA) are 1.278 and 0.629 for 1110821_g338
Found 4 entries without IDs and 3 entries that are acceptable afterglow candidates for 1110821_g338.
Acceptable entries have no ID, XRT distances < 5.5", and are > 0.8*(80 - 10*(mag-6))" from any bright star
from any bright star and >21.6" from other rejected sources.
0 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=38.9660 (02:35:51.84) DEC=55.2140 (+55:12:50.4)
XRT distances are from RA=38.9860 (02:35:56.65) DEC=55.2157 (+55:12:56.4)
-----------------
Entry 36 in the list of sources is a candidate afterglow for 1110821_g338 with 3x3 stamp
ra=38.96783 (02:35:52.28) dec=55.26567 (+55:15:56.4) +/- 1.1" mag=18.83+/-0.35
dist=183.8 REFID=64
*** The position of this source is inconsistent with the XRT position.
The position is 186.0 arc sec from the BAT position.
src: 36 distr. of nearby unmatched sources: 0 0 1 0 0
Found 2 entries in star catalog(s) within 20.0" of the candidate.
printing all entries
(Entries within 2 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
38.9624 55.2657 11.1 -1 USNO-B1 20.15 18.69 19.34
38.9740 55.2681 15.3 -1 USNO-B1 16.82 15.62 16.15
*** If XRT position is correct, then this is NOT the afterglow
-----------------
Entry 37 in the list of sources is a candidate afterglow for 1110821_g338 with 3x3 stamp
ra=38.97292 (02:35:53.50) dec=55.26813 (+55:16:05.3) +/- 1.1" mag=17.92+/-0.35
dist=190.8 REFID=42
*** The position of this source is inconsistent with the XRT position.
The position is 195.4 arc sec from the BAT position.
src: 37 distr. of nearby unmatched sources: 0 0 1 0 0
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
38.9740 55.2681 2.2 -1 USNO-B1 16.82 15.62 16.15 *
38.9794 55.2699 14.7 -1 USNO-B1 20.50 18.83 19.57
38.9799 55.2700 15.7 -1 USNO-B1 20.60 19.30 19.88
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 4" or brighter than 13 mag
-----------------
Entry 45 in the list of sources is a candidate afterglow for 1110821_g338 with 3x3 stamp
ra=38.89778 (02:35:35.47) dec=55.18241 (+55:10:56.7) +/- 1.1" mag=18.79+/-0.35
dist=217.4 REFID=65
*** The position of this source is inconsistent with the XRT position.
The position is 180.5 arc sec from the BAT position.
src: 45 distr. of nearby unmatched sources: 0 0 0 0 0
Found 5 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
38.9011 55.1875 19.5 -1 USNO-B1 20.22 18.43 19.22
38.9020 55.1845 11.4 -1 USNO-B1 18.25 16.98 17.54
38.8966 55.1853 10.7 -1 USNO-B1 99.99 19.12 99.99
38.8952 55.1822 5.3 -1 USNO-B1 99.99 19.52 99.99
38.8914 55.1842 14.7 -1 USNO-B1 18.81 17.60 18.14
*** If XRT position is correct, then this is NOT the afterglow
Found 1 entries in star catalog(s) within 10" of the XRT position.
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
38.9885 55.2171 7.2 -1 USNO-B1 18.98 17.33 18.06
The closest star is 7.20" away.
List UVOT sources within 10" of the XRT position:
Good candidates have no ID, acceptable profiles,
mag between 9.01 and 18.12, XRT distances < 5.5",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
srclist paragraph message for exposure 2 of trigger 1110821
WARNING -- because of the LARGE EXTINCTION, results should be used cautiously.
------ Start for Possible Stand-alone Circular ----
In response to GRB220618 (Swift/BAT trigger 1110821) at 09:10:29 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
309 seconds after the BAT trigger. No credible afterglow candidate has been
found in the initial data products. The 2.7'x2.7' sub-image covers 100% of the
XRT error circle. The typical 3-sigma upper limit has been about 19.2 mag. The
8'x8' region for the list of sources generated on-board covers 100% of the XRT
error circle. The list of sources is typically complete to about 18.0 mag. No
correction has been made for the large, but uncertain, extinction expected.
------- notes for trigger 1110821 ------
uvot_gcn_auto.pl vrs. 2020-10-27 fem at 220618d13h18m30s899558usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1110821
-expid=677236568 -meonly -msg_srclist
Results from standard processing of UVOT TDRSS data for this trigger should be
available at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/1110821/
Links to data for all triggers can be found at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/
Unreliable extinction found for xrt position. XRT position found for srclist.
XRT position found for Genie image. BAT position found.
UVOT exposure began at MET 677236568.5996 or about 2022:169:09:16:03 UT
Found 1267 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 27% of the srclist region. Found 66 sources in
srclist catalog. Found 4 srclist source(s) without IDs. There are 0 good
candidate(s) in the srclist catalog. Good candidates must be brighter than
18.12 mag.
Found 20 source(s) in Genie image catalog. Found 0 Genie image source(s)
without IDs. There are 0 good candidate(s) in the Genie image catalog. Good
candidates must be brighter than 19.66 mag. Found 282 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
28% of the Genie image region.
Genie image analysis:
Found 69309.6 counts in the large background region of 5705.0 pixels or a rate
of 12.149 counts/pixel in a radius of 45.0 arcsec. Based on this background,
the typical 5-sigma UL at a random point in the Genie image is 18.94 mag. for a
4-arcsec aperture.
Found 2524.3 counts in the XRT position region of 195.0 pixels or a rate of
12.945 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 0.614 +/- 0.217 (1-sigma) cps or
18.70 mag and a range from 18.38 to 19.18 mag. The 3-sigma UL at the XRT
position is 1.264 cps or 17.92 mag. The closest srclist source has ra= 38.9947
dec= 55.2199 mag=15.61 sep=23.24". The closest Genie source has ra= 38.9945
dec= 55.2198 mag=15.18 sep=22.80".
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?
677236568 308 U srclist found no candidates.
677236568 308 U image found no candidates.
List afterglow candidates for other finding charts.
677236410 150 WHITE srclist found no candidates.
677236410 150 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: 55.21567
GRB_ERROR: 5.5
GRB_RA: 38.98604
IMAGE_START_TIME: 09:16:03
MAGNITUDE: 17.9
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT