image overlap message for exposure 3 of trigger 851855
uvot_overlap.pl vrs. 2010-12-20b fem started at 180805d16h14m17s924580usUT
The observation of trigger 851855 started 2018-08-05T13:17:30.8
Examining file ./851855_g893_uvot_sky_image.fits
The exposure ID is 555167850
The exposure time is 149.857 (seconds)
The filter is WHITE.
The uvot region is centered at (25.7845,-17.4895) 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 1.822 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 6.49 sq. arc min or 0.23 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 0.286 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 3 of trigger 851855
find_uvot_ag.pl vrs. 2017-02-17 fem started at 180805d16h14m37s897609usUT
Observation start time is 2018-08-05T13:17:30.8
Examining file ./851855_g893_uvot_catalog_image.fits
The exposure ID is 555167850
The exposure is 149.857 sec.
The bin size is 2 pixels
The filter is WHITE
There are 3 detected source(s) for 851855_g893
Aspect correction adds 0.00176 degrees (0.423 sec of time = 6.05 arc sec) to RA
Aspect correction adds 0.00032 degrees ( 1.15 arcsec) to Dec
Total aspect correction is 6.16 arcsec
Star catalogs centered at 25.7771 , -17.4860 with radius 2.46 arc min.
n_usno: 47 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 3 matched entries is 0.816" for 851855_g893
Mean and std. dev of mag. difference (MAG_DELTA) are 1.233 and 0.800 for 851855_g893
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 851855_g893.
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)
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
There are 50507.000 counts in the bkg source region of 6194.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 8.154 counts/pixel (5-sig UL in 4" is 20.21 mag) for 851855_g893
There are 1585.9078 counts in the xrt source region of 198.00000 pixels.
Rate in xrt region with 8 arcsec radius is 8.010 counts/pixel for 851855_g893
There are 10154.026 counts in the xrt_bkg source region of 1242.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 8.176 counts/pixel (5-sig UL in 4" is 20.21 mag) for 851855_g893
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 20.76, 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_555167850_180805d16h14m37s897609usUT_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(25.7845,-17.4895,45")
fk5;-circle(25.7893337936941,-17.4860063381391,6")
Region file: 851855_555167850_180805d16h14m37s897609usUT_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_555167850_180805d16h14m37s897609usUT_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 3 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 872 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 180805d16h14m43s117841usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=851855
-expid=555167850 -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 555167850.84872 or about 2018:217:13:17:25 UT
Found 505 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 4% of the srclist region. Found 136 sources in
srclist catalog. Found 97 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 3 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 20.76 mag. Found 43 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 50507.0 counts in the large background region of 6194.0 pixels or a rate
of 8.154 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 20.21 mag. for a
4-arcsec aperture.
Found 1585.9 counts in the XRT position region of 198.0 pixels or a rate of
8.010 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is -0.219 +/- 0.286 (1-sigma) cps. The
3-sigma UL at the XRT position is 0.859 cps or 19.95 mag. The closest srclist
source has ra= 25.7894 dec= -17.4861 mag=18.55 sep=37.37". The closest Genie
source has ra= 25.7893 dec= -17.4860 mag=17.79 sep=37.44".
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?
555167850 872 WHITE srclist found no candidates.
555167850 872 WHITE 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.
555167274 296 U srclist found no candidates.
555167274 296 U 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: 13:17:25
MAGNITUDE: 19.9
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT