image overlap message for exposure 2 of trigger 853882
uvot_overlap.pl vrs. 2010-12-20b fem started at 180818d15h53m03s931335usUT
The observation of trigger 853882 started 2018-08-18T12:44:59.7
Examining file ./853882_g880_uvot_sky_image.fits
The exposure ID is 556289099
The exposure time is 149.879 (seconds)
The filter is WHITE.
The uvot region is centered at (104.2295,39.3151) 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 0.870 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 0.227 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 2 of trigger 853882
find_uvot_ag.pl vrs. 2017-02-17 fem started at 180818d15h53m12s136827usUT
Observation start time is 2018-08-18T12:44:59.7
Examining file ./853882_g880_uvot_catalog_image.fits
The exposure ID is 556289099
The exposure is 149.879 sec.
The bin size is 2 pixels
The filter is WHITE
There are 7 detected source(s) for 853882_g880
Aspect correction adds 0.00035 degrees (0.085 sec of time = 0.98 arc sec) to RA
Aspect correction adds -0.00077 degrees (-2.78 arcsec) to Dec
Total aspect correction is 2.95 arcsec
Star catalogs centered at 104.2209 , 39.3212 with radius 2.64 arc min.
n_usno: 82 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 7 matched entries is 0.219" for 853882_g880
Mean and std. dev of mag. difference (MAG_DELTA) are 0.559 and 0.203 for 853882_g880
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 853882_g880.
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 2.1897370E+05 counts in the bkg source region of 6119.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 35.786 counts/pixel (5-sig UL in 4" is 19.41 mag) for 853882_g880
There are 7154.3369 counts in the xrt source region of 199.00000 pixels.
Rate in xrt region with 8 arcsec radius is 35.951 counts/pixel for 853882_g880
There are 44600.441 counts in the xrt_bkg source region of 1246.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 35.795 counts/pixel (5-sig UL in 4" is 19.41 mag) for 853882_g880
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 19.96, 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_556289099_180818d15h53m12s136827usUT_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(104.2295,39.3151,45")
fk5;-circle(104.233517874952,39.3106354813989,6")
fk5;-circle(104.226187767105,39.3028898610103,6")
fk5;-circle(104.243094628173,39.3070563001441,6")
Region file: 853882_556289099_180818d15h53m12s136827usUT_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_556289099_180818d15h53m12s136827usUT_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(104.233517874952,39.3106354813989,6")
image paragraph message for exposure 2 of trigger 853882
SRCLIST PROBLEM: srclist filled telemetry buffer
------ 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 859 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 180818d15h53m14s646559usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=853882
-expid=556289099 -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 556289099.68414 or about 2018:230:12:44:54 UT
Found 762 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 7% of the srclist region. Found 190 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 70 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 7 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 19.96 mag. Found 78 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 218973.7 counts in the large background region of 6119.0 pixels or a rate
of 35.786 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 19.41 mag. for a
4-arcsec aperture.
Found 7154.3 counts in the XRT position region of 199.0 pixels or a rate of
35.951 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 0.207 +/- 0.607 (1-sigma) cps or
21.49 mag and a range from 20.00 to 99.99 mag. The 3-sigma UL at the XRT
position is 2.029 cps or 19.01 mag. The number of srclist sources filled the
available telemetry. The weakest source detected was 18.88 mag. The closest
srclist source has ra= 104.2263 dec= 39.3029 mag=18.71 sep=46.26". The closest
Genie source has ra= 104.2335 dec= 39.3106 mag=19.53 sep=30.61".
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?
556289099 859 WHITE srclist found no candidates.
556289099 859 WHITE image found no candidates.
List afterglow candidates for other finding charts.
556288452 212 WHITE srclist found no candidates.
556288452 212 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: 12:44:54
MAGNITUDE: 19.0
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT