srclist overlap message for exposure 2 of trigger 992444
uvot_overlap.pl vrs. 2010-12-20b fem started at 200821d13h29m49s992161usUT
The observation of trigger 992444 started 2020-08-21T13:20:41.5
Examining file 992444_g335_uvot_sky_srclist.fits
The exposure ID is 619708841
The exposure time is undefined.
The filter is U.
The uvot region is centered at (353.5772,-48.2817) with a roll angle of 145.2
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 (353.5700,-48.2770) with a radius of 3.000 arc min
This is 0.401 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
Could not find the location of an XRT error circle
srclist afterglow message for exposure 2 of trigger 992444
find_uvot_ag.pl vrs. 2017-02-17 fem started at 200821d13h29m51s091444usUT
Observation start time is 2020-08-21T13:20:41.5
Examining file 992444_g335_uvot_catalog_srclist.fits
The exposure ID is 619708841
The exposure is 250.000 sec.
The bin size is 2 pixels
The filter is U
There are 44 detected source(s) for 992444_g335
Aspect correction adds 0.00203 degrees (0.487 sec of time = 4.86 arc sec) to RA
Aspect correction adds -0.00165 degrees (-5.93 arcsec) to Dec
Total aspect correction is 7.67 arcsec
Star catalogs centered at 353.5759 , -48.2739 with radius 8.56 arc min.
n_usno: 364 n_gsc: 0
*** WARNING -- bright star catalog has 2 entries brighter than 12 mag
The brightest has mag 11.06454
RA DEC Mag Color
bright star 0: 353.68853 (23:34:45.25) -48.23744 (-48:14:14.8) 11.20 USNO-R
bright star 1: 353.54524 (23:34:10.86) -48.16066 (-48:09:38.4) 11.06 USNO-V
*** WARNING -- no XRT distances are available.
Mean distance difference (CAT_DELTA) for 36 matched entries is 0.781" for 992444_g335
Mean and std. dev of mag. difference (MAG_DELTA) are 1.717 and 0.686 for 992444_g335
Found 8 entries without IDs and 2 entries that are acceptable afterglow candidates for 992444_g335.
Acceptable entries have no ID, BAT distance < 200" or XRT distance < 10", and are > 0.8*(80 - 10*(mag-6))" from any bright star
from any bright star and >21.6" from other rejected sources.
2 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=353.5700 (23:34:16.80) DEC=-48.2770 (-48:16:37.2)
XRT distances are as reported in catalog file.
-----------------
Entry 0 in the list of sources is a candidate afterglow for 992444_g335 with 3x3 stamp
ra=353.58409 (23:34:20.18) dec=-48.27215 (-48:16:19.7) +/- 1.1" mag=20.11+/-0.35
dist=38.0 REFID=44
src: 0 distr. of nearby unmatched sources: 0 0 0 0 0
Found 0 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)
##### This source remains a candidate #####
It has no entries within 4" or brighter than 13 mag
-----------------
Entry 8 in the list of sources is a candidate afterglow for 992444_g335 with 5x5 stamp
ra=353.63269 (23:34:31.84) dec=-48.28900 (-48:17:20.4) +/- 1.1" mag=19.62+/-0.35
dist=156.2 REFID=37
src: 8 distr. of nearby unmatched sources: 0 0 0 0 0
Found 2 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
353.6338 -48.2902 5.3 -1 USNO-B1 13.28 12.72 12.97 *
353.6376 -48.2901 12.5 -1 USNO-B1 99.99 20.01 99.99
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 4" or brighter than 13 mag
Good candidates have no ID, acceptable profiles,
mag between 9.01 and 17.56, BAT distances < 200",
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 992444
------ Start for Possible Stand-alone Circular ----
In response to GRB200821 (Swift/BAT trigger 992444) at 13:15:05 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of nominal 250.000 seconds with the U filter
starting 310 seconds after the BAT trigger. No credible afterglow candidate has
been found in the initial data products. Data from the 2.7'x2.7' sub-image are
not available at this time. The 8'x8' region for the list of sources generated
on-board covers 100% of the BAT error circle. The list of sources is typically
complete to about 18.0 mag. No correction has been made for the expected
extinction corresponding to E(B-V) of 0.01.
------- notes for trigger 992444 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 200821d13h29m52s286860usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=992444
-expid=619708841 -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/992444/
Links to data for all triggers can be found at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/
*** Warning -- no exposure found, using srclist assumed value.
No XRT position found for srclist. BAT position found.
UVOT exposure began at MET 619708841.46444 or about 2020:234:13:20:36 UT
Found 360 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 3% of the srclist region. Found 44 sources in
srclist catalog. Found 8 srclist source(s) without IDs. There are 0 good
candidate(s) in the srclist catalog. Good candidates must be brighter than
17.56 mag.
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?
619708841 309 U 353.58409 -48.27215 20.11/17.6 38.0 srclist Yes
619708841 309 ? image data are not available.
List afterglow candidates for other finding charts.
619708683 151 WHITE 353.60722 -48.30090 20.96/18.7 123.9 srclist Yes
619708683 151 WHITE 353.60232 -48.27443 20.83/20.3 78.0 image Yes
------- Tokens for Quick GCN -------
CATALOG_TYPE: SRCLIST
FILTER: u
GRB_DEC: -48.27700
GRB_ERROR: 200
GRB_RA: 353.57000
IMAGE_START_TIME: 13:20:36
MAGNITUDE: 18.0
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: BAT