image overlap message for exposure 1 of trigger 853882
uvot_overlap.pl vrs. 2010-12-20b fem started at 180818d15h53m03s400483usUT
The observation of trigger 853882 started 2018-08-18T12:34:12.5
Examining file ./853882_g233_uvot_sky_image.fits
The exposure ID is 556288452
The exposure time is 149.868 (seconds)
The filter is WHITE.
The uvot region is centered at (104.2290,39.3131) with a roll angle of 112.2
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 (104.2350,39.3290) with a radius of 3.000 arc min
This is 0.992 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 7.17 sq. arc min or 0.25 of the BAT error circle
The XRT error circle is centered at (104.2247,39.3157) with a radius of 0.028 arc min
This is 0.252 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 853882
find_uvot_ag.pl vrs. 2017-02-17 fem started at 180818d15h53m06s222954usUT
Observation start time is 2018-08-18T12:34:12.5
Examining file ./853882_g233_uvot_catalog_image.fits
The exposure ID is 556288452
The exposure is 149.868 sec.
The bin size is 2 pixels
The filter is WHITE
There are 13 detected source(s) for 853882_g233
Aspect correction adds 0.00028 degrees (0.066 sec of time = 0.77 arc sec) to RA
Aspect correction adds -0.00048 degrees (-1.74 arcsec) to Dec
Total aspect correction is 1.90 arcsec
Star catalogs centered at 104.2237 , 39.3139 with radius 2.69 arc min.
n_usno: 84 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 13 matched entries is 0.441" for 853882_g233
Mean and std. dev of mag. difference (MAG_DELTA) are 0.710 and 0.499 for 853882_g233
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 853882_g233.
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=104.2350 (06:56:56.40) DEC=39.3290 (+39:19:44.4)
XRT distances are from RA=104.2247 (06:56:53.93) DEC=39.3157 (+39:18:56.6)
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
There are 1.3798998E+05 counts in the bkg source region of 6022.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 22.914 counts/pixel (5-sig UL in 4" is 19.65 mag) for 853882_g233
There are 4502.5771 counts in the xrt source region of 200.00000 pixels.
Rate in xrt region with 8 arcsec radius is 22.513 counts/pixel for 853882_g233
There are 28512.068 counts in the xrt_bkg source region of 1248.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 22.846 counts/pixel (5-sig UL in 4" is 19.65 mag) for 853882_g233
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 20.20, 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: 853882_556288452_180818d15h53m06s222954usUT_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(104.2290,39.3131,45")
fk5;-circle(104.233397521811,39.3106652618901,6")
fk5;-circle(104.226348233085,39.302911106217,6")
fk5;-circle(104.24308124524,39.3071099143497,6")
Region file: 853882_556288452_180818d15h53m06s222954usUT_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(104.22471,39.31572,8")
Region file: 853882_556288452_180818d15h53m06s222954usUT_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(104.22471,39.31572,25")
fk5;-circle(104.22471,39.31572,15")
fk5;-circle(104.233397521811,39.3106652618901,6")
image paragraph message for exposure 1 of trigger 853882
------ Start for Possible Stand-alone Circular ----
In response to GRB180818 (Swift/BAT trigger 853882) at 12:30:18 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 212 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
0.09.
------- notes for trigger 853882 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 180818d15h53m09s056558usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=853882
-expid=556288452 -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/853882/
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 556288452.54808 or about 2018:230:12:34:07 UT
Found 428 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 8% of the srclist region. Found 61 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 13 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 20.20 mag. Found 80 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
7% of the Genie image region.
Genie image analysis:
Found 137990.0 counts in the large background region of 6022.0 pixels or a rate
of 22.914 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 19.65 mag. for a
4-arcsec aperture.
Found 4502.6 counts in the XRT position region of 200.0 pixels or a rate of
22.513 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is -0.444 +/- 0.482 (1-sigma) cps. The
3-sigma UL at the XRT position is 1.447 cps or 19.38 mag. The closest srclist
source has ra= 104.2261 dec= 39.3030 mag=18.77 sep=45.87". The closest Genie
source has ra= 104.2334 dec= 39.3107 mag=19.67 sep=30.28".
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?
556288452 212 WHITE srclist found no candidates.
556288452 212 WHITE image found no candidates.
List afterglow candidates for other finding charts.
556289099 859 WHITE srclist found no candidates.
556289099 859 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: 39.31572
GRB_ERROR: 5
GRB_RA: 104.22471
IMAGE_START_TIME: 12:34:07
MAGNITUDE: 19.4
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT