srclist overlap message for exposure 2 of trigger 992099
uvot_overlap.pl vrs. 2010-12-20b fem started at 200819d18h24m22s765542usUT
The observation of trigger 992099 started 2020-08-19T15:49:18.8
Examining file ./992099_g325_uvot_sky_srclist.fits
The exposure ID is 619544958
The exposure time is undefined.
The filter is U.
The uvot region is centered at (21.4360,63.0523) with a roll angle of 50.6
It is square with sides of 12.05 arc min. for an area of 145.15 sq arc min
The BAT error circle is centered at (21.4280,63.0480) with a radius of 3.000 arc min
This is 0.340 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 (21.4242,63.0609) with a radius of 0.037 arc min
This is 0.606 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 992099
find_uvot_ag.pl vrs. 2017-02-17 fem started at 200819d18h24m34s552115usUT
Observation start time is 2020-08-19T15:49:18.8
Examining file ./992099_g325_uvot_catalog_srclist.fits
The exposure ID is 619544958
The exposure is 249.935 sec.
The bin size is 2 pixels
The filter is U
There are 96 detected source(s) for 992099_g325
Aspect correction adds 0.00319 degrees (0.765 sec of time = 5.20 arc sec) to RA
Aspect correction adds 0.00100 degrees ( 3.60 arcsec) to Dec
Total aspect correction is 6.33 arcsec
Star catalogs centered at 21.4436 , 63.0622 with radius 8.68 arc min.
n_usno: 3221 n_gsc: 0
*** WARNING -- bright star catalog has 5 entries brighter than 12 mag
The brightest has mag 10.10852
RA DEC Mag Color
bright star 0: 21.53335 (01:26:08.00) 63.03413 (+63:02:02.9) 10.11 USNO-V
bright star 1: 21.49018 (01:25:57.64) 62.97467 (+62:58:28.8) 11.95 USNO-V
bright star 2: 21.25379 (01:25:00.91) 63.10120 (+63:06:04.3) 11.48 USNO-V
bright star 3: 21.65802 (01:26:37.92) 63.07598 (+63:04:33.5) 10.76 USNO-V
bright star 4: 21.64419 (01:26:34.60) 63.15653 (+63:09:23.5) 11.33 USNO-V
Mean distance difference (CAT_DELTA) for 53 matched entries is 0.918" for 992099_g325
Mean and std. dev of mag. difference (MAG_DELTA) are 1.898 and 0.857 for 992099_g325
Found 44 entries without IDs and 1 entries that are acceptable afterglow candidates for 992099_g325.
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.
39 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=21.4280 (01:25:42.72) DEC=63.0480 (+63:02:52.8)
XRT distances are from RA=21.4242 (01:25:41.81) DEC=63.0609 (+63:03:39.3)
*** WARNING 45 per cent of entries have no IDs.
-----------------
Entry 5 in the list of sources is a candidate afterglow for 992099_g325 with 3x3 stamp
ra=21.34958 (01:25:23.90) dec=63.04620 (+63:02:46.3) +/- 1.1" mag=18.57+/-0.35
dist=132.8 REFID=90
*** The position of this source is inconsistent with the XRT position.
The position is 128.1 arc sec from the BAT position.
src: 5 srclist_match has ID
src: 5 distr. of nearby unmatched sources: 0 0 0 0 0
Found 7 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
21.3471 63.0499 14.1 -1 USNO-B1 20.11 17.31 18.55
21.3489 63.0466 1.9 -1 USNO-B1 17.55 15.57 16.44 *
21.3515 63.0435 10.1 -1 USNO-B1 16.29 14.91 15.52
21.3452 63.0476 8.8 -1 USNO-B1 19.70 18.56 19.07
21.3441 63.0474 10.0 -1 USNO-B1 20.98 99.99 99.99
21.3434 63.0472 10.7 -1 USNO-B1 19.92 17.20 18.41
21.3397 63.0467 16.2 -1 USNO-B1 19.27 16.70 17.84
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 4" or brighter than 13 mag
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
21.4214 63.0596 6.6 -1 USNO-B1 21.12 19.02 19.96
The closest star is 6.57" away.
List UVOT sources within 10" of the XRT position:
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 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 992099
WARNING -- because of the LARGE EXTINCTION, results should be used cautiously.
------ Start for Possible Stand-alone Circular ----
In response to GRB200819 (Swift/BAT trigger 992099) at 15:43:52 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
300 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 992099 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 200819d18h24m39s148351usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=992099
-expid=619544958 -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/992099/
Links to data for all triggers can be found at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/
Large extinction of 5.21 found for bat position. 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 619544958.84512 or about 2020:232:15:49:13 UT
Found 3217 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 29% of the srclist region. Found 96 sources in
srclist catalog. Found 44 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 6 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 19.59 mag. Found 310 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 33% of the
Genie image region.
Genie image analysis:
Found 83221.7 counts in the large background region of 6018.0 pixels or a rate
of 13.829 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 19.08 mag. for a
4-arcsec aperture.
Found 2813.6 counts in the XRT position region of 198.0 pixels or a rate of
14.210 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 0.371 +/- 0.229 (1-sigma) cps or
19.46 mag and a range from 18.94 to 20.50 mag. The 3-sigma UL at the XRT
position is 1.056 cps or 18.32 mag. The closest srclist source has ra= 21.4390
dec= 63.0644 mag=18.21 sep=27.25". The closest Genie source has ra= 21.4385
dec= 63.0648 mag=17.47 sep=27.15".
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?
619544958 299 U srclist found no candidates.
619544958 299 U image found no candidates.
List afterglow candidates for other finding charts.
619544746 87 WHITE srclist found no candidates.
619544746 87 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: 63.06092
GRB_ERROR: 5.5
GRB_RA: 21.42421
IMAGE_START_TIME: 15:49:13
MAGNITUDE: 18.3
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT