srclist overlap message for exposure 1 of trigger 992099
uvot_overlap.pl vrs. 2010-12-20b fem started at 200819d18h24m22s148608usUT
The observation of trigger 992099 started 2020-08-19T15:45:46.8
Examining file ./992099_g113_uvot_sky_srclist.fits
The exposure ID is 619544746
The exposure time is undefined.
The filter is WHITE.
The uvot region is centered at (21.4358,63.0551) with a roll angle of 50.6
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 (21.4280,63.0480) with a radius of 3.000 arc min
This is 0.478 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 0.470 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 1 of trigger 992099
find_uvot_ag.pl vrs. 2017-02-17 fem started at 200819d18h24m25s294966usUT
Observation start time is 2020-08-19T15:45:46.8
Examining file ./992099_g113_uvot_catalog_srclist.fits
The exposure ID is 619544746
The exposure is 149.868 sec.
The bin size is 2 pixels
The filter is WHITE
There are 133 detected source(s) for 992099_g113
Aspect correction adds 0.00299 degrees (0.719 sec of time = 4.89 arc sec) to RA
Aspect correction adds 0.00097 degrees ( 3.50 arcsec) to Dec
Total aspect correction is 6.01 arcsec
Star catalogs centered at 21.4335 , 63.0533 with radius 6.22 arc min.
n_usno: 1755 n_gsc: 0
*** WARNING -- bright star catalog has 3 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
Mean distance difference (CAT_DELTA) for 103 matched entries is 0.751" for 992099_g113
Mean and std. dev of mag. difference (MAG_DELTA) are 1.581 and 0.728 for 992099_g113
Found 37 entries without IDs and 1 entries that are acceptable afterglow candidates for 992099_g113.
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.
36 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 27 per cent of entries have no IDs.
-----------------
Entry 23 in the list of sources is a candidate afterglow for 992099_g113 with 3x3 stamp
ra=21.47450 (01:25:53.88) dec=63.02172 (+63:01:18.2) +/- 1.1" mag=18.55+/-0.35
dist=163.3 REFID=75
*** The position of this source is inconsistent with the XRT position.
The position is 121.3 arc sec from the BAT position.
src: 23 distr. of nearby unmatched sources: 0 0 0 0 0
Found 6 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
21.4630 63.0235 19.9 -1 USNO-B1 99.99 19.12 99.99
21.4754 63.0266 17.6 -1 USNO-B1 20.59 17.73 19.00
21.4629 63.0233 19.8 -1 USNO-B1 99.99 18.41 99.99
21.4628 63.0231 19.7 -1 USNO-B1 20.35 18.59 19.37
21.4744 63.0226 3.3 -1 USNO-B1 15.80 13.44 14.49 *
21.4840 63.0245 18.5 -1 USNO-B1 17.70 16.27 16.91
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 19.22, 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 1 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 150 seconds with the White filter
starting 88 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 19.6 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 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 200819d18h24m30s452273usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=992099
-expid=619544746 -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 619544746.82556 or about 2020:232:15:45:41 UT
Found 1751 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 31% of the srclist region. Found 133 sources in
srclist catalog. Found 37 srclist source(s) without IDs. There are 0 good
candidate(s) in the srclist catalog. Good candidates must be brighter than
19.22 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 20.26 mag. Found 347 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
32% of the Genie image region.
Genie image analysis:
Found 116200.9 counts in the large background region of 5611.0 pixels or a rate
of 20.709 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 19.70 mag. for a
4-arcsec aperture.
Found 4244.7 counts in the XRT position region of 202.0 pixels or a rate of
21.013 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 0.646 +/- 0.474 (1-sigma) cps or
20.25 mag and a range from 19.66 to 21.69 mag. The 3-sigma UL at the XRT
position is 2.066 cps or 18.99 mag. The closest srclist source has ra= 21.4384
dec= 63.0647 mag=17.39 sep=26.80". The closest Genie source has ra= 21.4318
dec= 63.0654 mag=19.01 sep=20.36".
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?
619544746 87 WHITE srclist found no candidates.
619544746 87 WHITE image found no candidates.
List afterglow candidates for other finding charts.
619544958 299 U srclist found no candidates.
619544958 299 U image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: 63.06092
GRB_ERROR: 5.5
GRB_RA: 21.42421
IMAGE_START_TIME: 15:45:41
MAGNITUDE: 19.0
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT