image overlap message for exposure 1 of trigger 851855
uvot_overlap.pl vrs. 2010-12-20b fem started at 180805d16h14m15s673121usUT
The observation of trigger 851855 started 2018-08-05T13:04:22.7
Examining file ./851855_g105_uvot_sky_image.fits
The exposure ID is 555167062
The exposure time is 149.868 (seconds)
The filter is WHITE.
The uvot region is centered at (25.7862,-17.4899) with a roll angle of 78.7
It is square with sides of 2.68 arc min. for an area of 7.17 sq arc min
The BAT error circle is centered at (25.8130,-17.5030) with a radius of 3.000 arc min
This is 1.723 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 6.76 sq. arc min or 0.24 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 0.334 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
image afterglow message for exposure 1 of trigger 851855
find_uvot_ag.pl vrs. 2017-02-17 fem started at 180805d16h14m20s641578usUT
Observation start time is 2018-08-05T13:04:22.7
Examining file ./851855_g105_uvot_catalog_image.fits
The exposure ID is 555167062
The exposure is 149.868 sec.
The bin size is 2 pixels
The filter is WHITE
There are 4 detected source(s) for 851855_g105
Aspect correction adds 0.00145 degrees (0.347 sec of time = 4.97 arc sec) to RA
Aspect correction adds 0.00094 degrees ( 3.40 arcsec) to Dec
Total aspect correction is 6.02 arcsec
Star catalogs centered at 25.7846 , -17.4903 with radius 2.62 arc min.
n_usno: 52 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 3 matched entries is 0.140" for 851855_g105
Mean and std. dev of mag. difference (MAG_DELTA) are 0.458 and 0.427 for 851855_g105
Found 1 entries without IDs and 1 entries that are acceptable afterglow candidates for 851855_g105.
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 1 in the list of sources is a candidate afterglow for 851855_g105 with genie
ra=25.79030 (01:43:09.67) dec=-17.51392 (-17:30:50.1) +/- 0.7" mag=20.13+/-0.19
dist=79.4 REFID=1 major=1.7 minor=0.5 flag=16 (aperture_incomplete)
*** The position of this source is inconsistent with the XRT position.
The position is 87.3 arc sec from the BAT position.
This source is near the edge of image (0.981)
Found 7 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
25.7886 -17.5145 6.3 -1 USNO-B1 20.53 18.33 19.31
25.7894 -17.5149 4.6 -1 USNO-B1 19.10 18.90 18.99 *
25.7914 -17.5161 8.6 -1 USNO-B1 99.99 12.76 99.99
25.7906 -17.5164 9.1 -1 USNO-B1 13.42 12.83 13.09
25.7910 -17.5173 12.5 -1 USNO-B1 99.99 15.57 99.99
25.7900 -17.5187 17.3 -1 USNO-B1 20.59 19.09 19.76
25.7918 -17.5184 16.9 -1 USNO-B1 99.99 18.92 99.99
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 5.25" or brighter than 12 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 49707.031 counts in the bkg source region of 6196.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 8.022 counts/pixel (5-sig UL in 4" is 20.22 mag) for 851855_g105
There are 1595.4999 counts in the xrt source region of 201.00000 pixels.
Rate in xrt region with 8 arcsec radius is 7.938 counts/pixel for 851855_g105
There are 9971.8115 counts in the xrt_bkg source region of 1250.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 7.977 counts/pixel (5-sig UL in 4" is 20.22 mag) for 851855_g105
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 20.77, XRT distances < 5",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 851855_555167062_180805d16h14m20s641578usUT_bkg.region
# Region file format: DS9 version 3.0
global color=red font="helvetica 10 normal" select=1 edit=1 move=1 delete=1 include=1 fixed=0 source
fk5;circle(25.7862,-17.4899,45")
fk5;-circle(25.7894460938103,-17.4859492859796,6")
Region file: 851855_555167062_180805d16h14m20s641578usUT_xrt.region
# Region file format: DS9 version 3.0
global color=red font="helvetica 10 normal" select=1 edit=1 move=1 delete=1 include=1 fixed=0 source
fk5;circle(25.78171,-17.49344,8")
Region file: 851855_555167062_180805d16h14m20s641578usUT_xrt_bkg.region
# Region file format: DS9 version 3.0
global color=red font="helvetica 10 normal" select=1 edit=1 move=1 delete=1 include=1 fixed=0 source
fk5;circle(25.78171,-17.49344,25")
fk5;-circle(25.78171,-17.49344,15")
image paragraph message for exposure 1 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 150 seconds with the White filter
starting 84 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
0.02.
------- notes for trigger 851855 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 180805d16h14m26s002461usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=851855
-expid=555167062 -meonly -msg_image
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 555167062.7121 or about 2018:217:13:04:17 UT
Found 231 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 4% of the srclist region. Found 17 sources in
srclist catalog. Found 3 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 4 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 20.77 mag. Found 48 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 49707.0 counts in the large background region of 6196.0 pixels or a rate
of 8.022 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 20.22 mag. for a
4-arcsec aperture.
Found 1595.5 counts in the XRT position region of 201.0 pixels or a rate of
7.938 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is -0.053 +/- 0.287 (1-sigma) cps. The
3-sigma UL at the XRT position is 0.861 cps or 19.94 mag. The closest srclist
source has ra= 25.7893 dec= -17.4859 mag=18.20 sep=37.81". The closest Genie
source has ra= 25.7894 dec= -17.4859 mag=17.77 sep=37.85".
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?
555167062 84 WHITE srclist found no candidates.
555167062 84 WHITE image found no candidates.
List afterglow candidates for other finding charts.
555167274 296 U srclist found no candidates.
555167274 296 U 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: white
GRB_DEC: -17.49344
GRB_ERROR: 5
GRB_RA: 25.78171
IMAGE_START_TIME: 13:04:17
MAGNITUDE: 19.9
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT