srclist overlap message for exposure 2 of trigger 851855
uvot_overlap.pl vrs. 2010-12-20b fem started at 180805d16h14m14s940899usUT
The observation of trigger 851855 started 2018-08-05T13:07:54.5
Examining file ./851855_g317_uvot_sky_srclist.fits
The exposure ID is 555167274
The exposure time is undefined.
The filter is U.
The uvot region is centered at (25.7835,-17.4893) with a roll angle of 78.7
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 (25.8130,-17.5030) with a radius of 3.000 arc min
This is 1.879 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 25.93 sq. arc min or 0.92 of the BAT error circle
The XRT error circle is centered at (25.7817,-17.4934) with a radius of 0.030 arc min
This is 0.272 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 851855
find_uvot_ag.pl vrs. 2017-02-17 fem started at 180805d16h14m28s020205usUT
Observation start time is 2018-08-05T13:07:54.5
Examining file ./851855_g317_uvot_catalog_srclist.fits
The exposure ID is 555167274
The exposure is 249.924 sec.
The bin size is 2 pixels
The filter is U
There are 12 detected source(s) for 851855_g317
Aspect correction adds 0.00162 degrees (0.389 sec of time = 5.56 arc sec) to RA
Aspect correction adds 0.00093 degrees ( 3.35 arcsec) to Dec
Total aspect correction is 6.49 arcsec
Star catalogs centered at 25.7822 , -17.4791 with radius 4.79 arc min.
n_usno: 162 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 11 matched entries is 0.528" for 851855_g317
Mean and std. dev of mag. difference (MAG_DELTA) are 1.642 and 1.411 for 851855_g317
Found 1 entries without IDs and 1 entries that are acceptable afterglow candidates for 851855_g317.
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=25.8130 (01:43:15.12) DEC=-17.5030 (-17:30:10.8)
XRT distances are from RA=25.7817 (01:43:07.61) DEC=-17.4934 (-17:29:36.4)
-----------------
Entry 5 in the list of sources is a candidate afterglow for 851855_g317 with 5x5 stamp
ra=25.79974 (01:43:11.94) dec=-17.45359 (-17:27:12.9) +/- 1.1" mag=19.14+/-0.35
dist=156.3 REFID=9
*** The position of this source is inconsistent with the XRT position.
The position is 183.6 arc sec from the BAT position.
src: 5 distr. of nearby unmatched sources: 0 1 0 0 0
Found 5 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
25.8003 -17.4556 7.4 -1 USNO-B1 21.01 20.78 20.88
25.8004 -17.4547 4.7 -1 USNO-B1 21.37 20.55 20.91
25.8002 -17.4525 4.3 -1 USNO-B1 14.20 13.07 13.57
25.8009 -17.4520 7.0 -1 USNO-B1 20.27 12.93 16.19 *
25.8029 -17.4525 11.6 -1 USNO-B1 20.33 19.21 19.71
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 851855
------ Start for Possible Stand-alone Circular ----
In response to GRB180805 (Swift/BAT trigger 851855) at 13:02:36 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
296 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 19.2 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 18.0 mag. No
correction has been made for the expected extinction corresponding to E(B-V) of
0.02.
------- notes for trigger 851855 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 180805d16h14m30s847488usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=851855
-expid=555167274 -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/851855/
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 555167274.53312 or about 2018:217:13:07:49 UT
Found 158 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 4% of the srclist region. Found 12 sources in
srclist catalog. Found 1 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 3 source(s) in Genie image catalog. Found 1 Genie image source(s) without
IDs. There are 0 good candidate(s) in the Genie image catalog. Good candidates
must be brighter than 20.62 mag. Found 41 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 4% of the
Genie image region.
Genie image analysis:
Found 12930.0 counts in the large background region of 6195.0 pixels or a rate
of 2.087 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 20.11 mag. for a
4-arcsec aperture.
Found 419.1 counts in the XRT position region of 200.0 pixels or a rate of
2.095 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is -0.013 +/- 0.088 (1-sigma) cps. The
3-sigma UL at the XRT position is 0.265 cps or 19.82 mag. The closest srclist
source has ra= 25.7903 dec= -17.5166 mag=18.31 sep=88.45". The closest Genie
source has ra= 25.7893 dec= -17.4859 mag=19.06 sep=37.58".
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?
555167274 296 U srclist found no candidates.
555167274 296 U image found no candidates.
List afterglow candidates for other finding charts.
555167062 84 WHITE srclist found no candidates.
555167062 84 WHITE image found no candidates.
555167850 872 WHITE srclist found no candidates.
555167850 872 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: -17.49344
GRB_ERROR: 5
GRB_RA: 25.78171
IMAGE_START_TIME: 13:07:49
MAGNITUDE: 19.8
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT