srclist overlap message for exposure 1 of trigger 820347
uvot_overlap.pl vrs. 2010-12-20b fem started at 180331d06h27m08s604766usUT
The observation of trigger 820347 started 2018-03-31T04:17:12.2
Examining file ./820347_g136_uvot_sky_srclist.fits
The exposure ID is 544162632
The exposure time is undefined.
The filter is WHITE.
The uvot region is centered at (66.0102,13.3934) with a roll angle of 266.0
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 (66.0170,13.3980) with a radius of 3.000 arc min
This is 0.484 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 (66.0247,13.3989) with a radius of 0.030 arc min
This is 0.907 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 1 of trigger 820347
find_uvot_ag.pl vrs. 2017-02-17 fem started at 180331d06h27m11s967095usUT
Observation start time is 2018-03-31T04:17:12.2
Examining file ./820347_g136_uvot_catalog_srclist.fits
The exposure ID is 544162632
The exposure is 149.846 sec.
The bin size is 2 pixels
The filter is WHITE
There are 19 detected source(s) for 820347_g136
Aspect correction adds -0.00019 degrees (-0.047 sec of time = -0.68 arc sec) to RA
Aspect correction adds -0.00001 degrees (-0.03 arcsec) to Dec
Total aspect correction is 0.68 arcsec
Star catalogs centered at 66.0041 , 13.3927 with radius 5.66 arc min.
n_usno: 170 n_gsc: 144
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 17 matched entries is 0.486" for 820347_g136
Mean and std. dev of mag. difference (MAG_DELTA) are 1.163 and 0.417 for 820347_g136
Found 2 entries without IDs and 1 entries that are acceptable afterglow candidates for 820347_g136.
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.
Magnitude criteria will be applied later.
BAT distances are from RA=66.0170 (04:24:04.08) DEC=13.3980 (+13:23:52.8)
XRT distances are from RA=66.0247 (04:24:05.92) DEC=13.3989 (+13:23:56.1)
-----------------
Entry 2 in the list of sources is a candidate afterglow for 820347_g136 with 5x5 stamp
ra=66.01067 (04:24:02.56) dec=13.36479 (+13:21:53.2) +/- 1.1" mag=19.00+/-0.35
dist=132.3 REFID=18
*** The position of this source is inconsistent with the XRT position.
The position is 121.6 arc sec from the BAT position.
src: 2 srclist_match has ID
src: 2 distr. of nearby unmatched sources: 0 0 0 0 0
Found 2 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
66.0105 13.3653 2.0 -1 USNO-B1 18.88 16.65 17.64 *
66.0106 13.3653 1.8 -1 GSC2.3 16.54 18.52 17.24 *
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 19.22, 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 1 of trigger 820347
------ Start for Possible Stand-alone Circular ----
In response to GRB180331 (Swift/BAT trigger 820347) at 04:14:55 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 115 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 expected extinction corresponding to E(B-V) of
0.60.
------- notes for trigger 820347 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 180331d06h27m13s962809usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=820347
-expid=544162632 -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/820347/
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 544162632.1698 or about 2018:090:04:17:07 UT
Found 166 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 3% of the srclist region. Found 19 sources in
srclist catalog. Found 2 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 2 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 20.18 mag. Found 25 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 3% of the
Genie image region.
Genie image analysis:
Found 149062.1 counts in the large background region of 6195.0 pixels or a rate
of 24.062 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 19.62 mag. for a
4-arcsec aperture.
Found 4987.4 counts in the XRT position region of 202.0 pixels or a rate of
24.690 counts/pixel in a radius of 8.0 arcsec. The net count rate (using large
background region) at the XRT position is 0.846 +/- 0.478 (1-sigma) cps or
19.96 mag and a range from 19.47 to 20.87 mag. The 3-sigma UL at the XRT
position is 2.281 cps or 18.88 mag. The closest srclist source has ra= 66.0245
dec= 13.4040 mag=15.43 sep=18.38". The closest Genie source has ra= 66.0245
dec= 13.4040 mag=14.83 sep=18.18".
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?
544162632 115 WHITE srclist found no candidates.
544162632 115 WHITE image found no candidates.
List afterglow candidates for other finding charts.
544162790 273 U srclist found no candidates.
544162790 273 U image found no candidates.
544163392 875 WHITE srclist found no candidates.
544163392 875 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: 13.39892
GRB_ERROR: 5
GRB_RA: 66.02467
IMAGE_START_TIME: 04:17:07
MAGNITUDE: 18.9
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT