srclist overlap message for exposure 2 of trigger 915091
uvot_overlap.pl vrs. 2010-12-20b fem started at 190718d11h43m45s019843usUT
The observation of trigger 915091 started 2019-07-18T04:46:20.4
Examining file ./915091_g304_uvot_sky_srclist.fits
The exposure ID is 585117980
The exposure time is undefined.
The filter is U.
The uvot region is centered at (336.5365,-41.2223) with a roll angle of 109.2
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 (336.5310,-41.2210) with a radius of 3.000 arc min
This is 0.257 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 (336.5761,-41.2045) with a radius of 0.028 arc min
This is 2.083 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 915091
find_uvot_ag.pl vrs. 2017-02-17 fem started at 190718d11h43m57s606681usUT
Observation start time is 2019-07-18T04:46:20.4
Examining file ./915091_g304_uvot_catalog_srclist.fits
The exposure ID is 585117980
The exposure is 249.935 sec.
The bin size is 2 pixels
The filter is U
There are 39 detected source(s) for 915091_g304
Aspect correction adds 0.00057 degrees (0.137 sec of time = 1.55 arc sec) to RA
Aspect correction adds -0.00168 degrees (-6.03 arcsec) to Dec
Total aspect correction is 6.23 arcsec
Star catalogs centered at 336.5320 , -41.2269 with radius 8.13 arc min.
n_usno: 471 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 33 matched entries is 0.803" for 915091_g304
Mean and std. dev of mag. difference (MAG_DELTA) are 1.434 and 0.766 for 915091_g304
Found 6 entries without IDs and 0 entries that are acceptable afterglow candidates for 915091_g304.
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=336.5310 (22:26:07.44) DEC=-41.2210 (-41:13:15.6)
XRT distances are from RA=336.5761 (22:26:18.26) DEC=-41.2045 (-41:12:16.1)
Found NO acceptable entries.
Unidentified entry closest to XRT position is no. 8:
ra=336.58488 dec=-41.27431 +/- 1.1" mag=18.59+/-0.35 dist=252.6 REFID=24
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 915091
IMAGE PROBLEM: no overlap
------ Start for Possible Stand-alone Circular ----
In response to GRB190718 (Swift/BAT trigger 915091) at 04:41:15 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
281 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 none of the
XRT error circle. 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 18.0 mag. No correction has been made for the expected extinction
corresponding to E(B-V) of 0.01.
------- notes for trigger 915091 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 190718d11h44m03s030711usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=915091
-expid=585117980 -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/915091/
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 585117980.35886 or about 2019:199:04:46:15 UT
Found 467 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 4% of the srclist region. Found 39 sources in
srclist catalog. Found 6 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 1 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 20.61 mag. Found 26 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 4% of the
Genie image region. The XRT position was OUTSIDE the star catalog search
region.
Genie image analysis:
Found 13336.2 counts in the large background region of 6304.0 pixels or a rate
of 2.116 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 20.10 mag. for a
4-arcsec aperture. The closest srclist source has ra= 336.5522 dec= -41.2280
mag=19.10 sep=106.53". The closest Genie source has ra= 336.5521 dec= -41.2283
mag=18.47 sep=107.38".
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?
585117980 281 U srclist found no candidates.
585117980 281 U image found no candidates.
List afterglow candidates for other finding charts.
585117768 69 WHITE srclist found no candidates.
585117768 69 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: SRCLIST
FILTER: u
GRB_DEC: -41.20447
GRB_ERROR: 5
GRB_RA: 336.57608
IMAGE_START_TIME: 04:46:15
MAGNITUDE: 18.0
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT