srclist overlap message for exposure 2 of trigger 1000926
uvot_overlap.pl vrs. 2010-12-20b fem started at 201020d13h07m58s893694usUT
The observation of trigger 1000926 started 2020-10-20T05:52:54.2
Examining file ./1000926_g327_uvot_sky_srclist.fits
The exposure ID is 624865974
The exposure time is undefined.
The filter is U.
The uvot region is centered at (261.2401,31.4218) with a roll angle of 241.5
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 (261.2460,31.4250) with a radius of 3.000 arc min
This is 0.357 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 (261.2283,31.4280) with a radius of 0.030 arc min
This is 0.715 arc min from the center of the uvot region
The area of the XRT error circle is 0.003 sq. arc min
The UVOT/XRT overlap is 0.003 sq. arc min or 1.00 of the XRT error circle
srclist afterglow message for exposure 2 of trigger 1000926
find_uvot_ag.pl vrs. 2017-02-17 fem started at 201020d13h08m20s954497usUT
Observation start time is 2020-10-20T05:52:54.2
Examining file ./1000926_g327_uvot_catalog_srclist.fits
The exposure ID is 624865974
The exposure is 249.935 sec.
The bin size is 2 pixels
The filter is U
There are 172 detected source(s) for 1000926_g327
Aspect correction adds -0.00259 degrees (-0.622 sec of time = -7.96 arc sec) to RA
Aspect correction adds -0.00011 degrees (-0.40 arcsec) to Dec
Total aspect correction is 7.97 arcsec
Star catalogs centered at 261.2416 , 31.4227 with radius 8.92 arc min.
n_usno: 1031 n_gsc: 0
*** WARNING -- bright star catalog has 5 entries brighter than 12 mag
The brightest has mag 9.9674
RA DEC Mag Color
bright star 0: 261.26270 (17:25:03.05) 31.46773 (+31:28:03.8) 11.54 USNO-V
bright star 1: 261.13651 (17:24:32.76) 31.47116 (+31:28:16.2) 10.86 USNO-V
bright star 2: 261.19263 (17:24:46.23) 31.31613 (+31:18:58.1) 10.61 USNO-V
bright star 3: 261.26965 (17:25:04.72) 31.55351 (+31:33:12.6) 9.97 USNO-V
bright star 4: 261.17051 (17:24:40.92) 31.54914 (+31:32:56.9) 11.95 USNO-V
Mean distance difference (CAT_DELTA) for 103 matched entries is 0.947" for 1000926_g327
Mean and std. dev of mag. difference (MAG_DELTA) are 1.570 and 1.108 for 1000926_g327
Found 71 entries without IDs and 2 entries that are acceptable afterglow candidates for 1000926_g327.
Acceptable entries have no ID, XRT distances < 5", and are > 0.8*(80 - 10*(mag-6))" from any bright star
from any bright star and >21.6" from other rejected sources.
64 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=261.2460 (17:24:59.04) DEC=31.4250 (+31:25:30.0)
XRT distances are from RA=261.2283 (17:24:54.78) DEC=31.4280 (+31:25:40.9)
*** WARNING 41 per cent of entries have no IDs.
-----------------
Entry 4 in the list of sources is a candidate afterglow for 1000926_g327 with 1x1 stamp
ra=261.22007 (17:24:52.82) dec=31.39553 (+31:23:43.9) +/- 1.1" mag=18.79+/-0.35
dist=119.7 REFID=167
*** The position of this source is inconsistent with the XRT position.
The position is 132.7 arc sec from the BAT position.
src: 4 srclist_match has ID
src: 4 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
261.2203 31.3950 2.0 -1 USNO-B1 17.41 16.58 16.95 *
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 4" or brighter than 13 mag
-----------------
Entry 15 in the list of sources is a candidate afterglow for 1000926_g327 with 1x1 stamp
ra=261.25292 (17:25:00.70) dec=31.38218 (+31:22:55.8) +/- 1.1" mag=18.79+/-0.35
dist=181.6 REFID=171
*** The position of this source is inconsistent with the XRT position.
The position is 155.6 arc sec from the BAT position.
src: 15 distr. of nearby unmatched sources: 0 0 0 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
261.2494 31.3859 17.1 -1 USNO-B1 16.85 15.89 16.32
261.2511 31.3834 6.9 -1 USNO-B1 18.96 18.14 18.50
261.2536 31.3820 2.3 -1 USNO-B1 17.91 16.83 17.30 *
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 4" or brighter than 13 mag
Found 0 entries in star catalog(s) within 10" of the XRT position.
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",
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 1000926
------ Start for Possible Stand-alone Circular ----
In response to GRB201020 (Swift/BAT trigger 1000926) at 05:47:26 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
302 seconds after the BAT trigger. There is a candidate afterglow in the
rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 17:24:54.65 = 261.22771
DEC(J2000) = +31:25:42.0 = 31.42832
with a 90%-confidence error radius of about 0.94 arc sec. This position is 2.0
arc sec. from the center of the XRT error circle. The estimated magnitude is
19.95 with a 1-sigma error of about 0.24. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.04.
------- notes for trigger 1000926 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 201020d13h08m24s488814usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1000926
-expid=624865974 -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/1000926/
Links to data for all triggers can be found at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/
XRT position found for srclist. XRT position found for Genie image. BAT
position found.
UVOT exposure began at MET 624865974.20104 or about 2020:294:05:52:49 UT
Found 1027 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 8% of the srclist region. Found 172 sources in
srclist catalog. Found 71 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. 1 source(s) are within 10.0" of the
xrt position. Found 1 Genie image source(s) without IDs. There are 1 good
candidate(s) in the Genie image catalog. Good candidates must be brighter than
20.72 mag. Found 63 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 7% of the Genie image region. The
closest srclist source has ra= 261.2516 dec= 31.4346 mag=15.38 sep=75.65".
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?
624865974 302 U srclist found no candidates.
624865974 302 U 261.22771 31.42832 19.95/20.7 2.0 image Yes
List afterglow candidates for other finding charts.
624865816 144 WHITE 261.22761 31.42828 18.67/19.2 2.2 srclist Yes
624865816 144 WHITE 261.22779 31.42834 18.14/20.9 1.8 image Yes
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: 31.42832
GRB_ERROR: 0.94
GRB_RA: 261.22771
IMAGE_START_TIME: 05:52:49
MAGNITUDE: 19.95
MAG_ERROR: 0.24
MESSAGE_TYPE: ACK
SOURCE: XRT