srclist overlap message for exposure 3 of trigger 992444
uvot_overlap.pl vrs. 2010-12-20b fem started at 200821d13h35m55s984924usUT
The observation of trigger 992444 started 2020-08-21T13:29:56.0
Examining file 992444_g889_uvot_sky_srclist.fits
The exposure ID is 619709395
The exposure time is undefined.
The filter is WHITE.
The uvot region is centered at (353.5773,-48.2828) 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 0.453 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 3 of trigger 992444
find_uvot_ag.pl vrs. 2017-02-17 fem started at 200821d13h35m57s152490usUT
Observation start time is 2020-08-21T13:29:56.0
Examining file 992444_g889_uvot_catalog_srclist.fits
The exposure ID is 619709395
The exposure is 150.000 sec.
The bin size is 2 pixels
The filter is WHITE
There are 71 detected source(s) for 992444_g889
Aspect correction adds 0.00170 degrees (0.409 sec of time = 4.08 arc sec) to RA
Aspect correction adds -0.00191 degrees (-6.89 arcsec) to Dec
Total aspect correction is 8.01 arcsec
Star catalogs centered at 353.5753 , -48.2794 with radius 8.83 arc min.
n_usno: 396 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 65 matched entries is 0.743" for 992444_g889
Mean and std. dev of mag. difference (MAG_DELTA) are 1.911 and 1.161 for 992444_g889
Found 7 entries without IDs and 1 entries that are acceptable afterglow candidates for 992444_g889.
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 12 in the list of sources is a candidate afterglow for 992444_g889 with 3x3 stamp
ra=353.63834 (23:34:33.20) dec=-48.27399 (-48:16:26.4) +/- 1.1" mag=18.63+/-0.35
dist=164.1 REFID=42
src: 12 distr. of nearby unmatched sources: 0 0 0 0 0
Found 1 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
353.6379 -48.2748 3.1 -1 USNO-B1 15.22 14.86 15.02 *
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 18.66, 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 3 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 150.000 seconds with the White
filter starting 864 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 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 200821d13h35m58s319804usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=992444
-expid=619709395 -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 619709395.96786 or about 2020:234:13:29:50 UT
Found 392 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 3% of the srclist region. Found 71 sources in
srclist catalog. Found 7 srclist source(s) without IDs. There are 0 good
candidate(s) in the srclist catalog. Good candidates must be brighter than
18.66 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?
619709395 863 WHITE srclist found no candidates.
619709395 863 ? 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
619708841 309 U 353.58409 -48.27215 20.11/17.6 38.0 srclist Yes
619708841 309 U 353.60212 -48.27456 19.92/20.1 77.5 image Yes
------- Tokens for Quick GCN -------
CATALOG_TYPE: SRCLIST
FILTER: white
GRB_DEC: -48.27700
GRB_ERROR: 200
GRB_RA: 353.57000
IMAGE_START_TIME: 13:29:50
MAGNITUDE: 18.0
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: BAT