image overlap message for exposure 1 of trigger 863053
uvot_overlap.pl vrs. 2010-12-20b fem started at 180924d00h25m48s625660usUT
The observation of trigger 863053 started 2018-09-24T00:17:17.9
Examining file 863053_g946_uvot_sky_image.fits
The exposure ID is 559441037
The exposure time is 149.857 (seconds)
The filter is WHITE.
The uvot region is centered at (267.5676,-31.7695) with a roll angle of 271.4
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 (267.5740,-31.7670) with a radius of 3.000 arc min
This is 0.360 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
Could not find the location of an XRT error circle
image afterglow message for exposure 1 of trigger 863053
find_uvot_ag.pl vrs. 2017-02-17 fem started at 180924d00h25m49s682702usUT
Observation start time is 2018-09-24T00:17:17.9
Examining file 863053_g946_uvot_catalog_image.fits
The exposure ID is 559441037
The exposure is 149.857 sec.
The bin size is 2 pixels
The filter is WHITE
There are 12 detected source(s) for 863053_g946
Aspect correction adds -0.00087 degrees (-0.209 sec of time = -2.66 arc sec) to RA
Aspect correction adds 0.00039 degrees ( 1.41 arcsec) to Dec
Total aspect correction is 3.01 arcsec
Star catalogs centered at 267.5658 , -31.7683 with radius 2.66 arc min.
n_usno: 140 n_gsc: 0
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 11.43926
RA DEC Mag Color
bright star 0: 267.54063 (17:50:09.75) -31.74546 (-31:44:43.6) 11.44 USNO-V
*** WARNING -- no XRT distances are available.
Mean distance difference (CAT_DELTA) for 12 matched entries is 0.523" for 863053_g946
Mean and std. dev of mag. difference (MAG_DELTA) are 1.229 and 0.389 for 863053_g946
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 863053_g946.
Acceptable entries have no ID, BAT distance < 200" or XRT distance < 10", and are > 0.8*(80 - 10*(mag-6))" from any bright star
from any bright star and >21.6" from other rejected sources.
0 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=267.5740 (17:50:17.76) DEC=-31.7670 (-31:46:01.2)
XRT distances are as reported in catalog file.
There are 1.6084186E+05 counts in the bkg source region of 5986.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 26.870 counts/pixel (5-sig UL in 4" is 19.56 mag) for 863053_g946
Good candidates have no ID, acceptable profiles,
mag between 9.01 and 19.56, BAT distances < 200",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 863053_559441037_180924d00h25m49s682702usUT_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(267.5676,-31.7695,45")
fk5;-circle(267.56585065868,-31.7559851512923,6")
fk5;-circle(267.55883918672,-31.7650975271177,6")
fk5;-circle(267.568811728468,-31.7810408960526,6")
fk5;-circle(267.554261496439,-31.7699741528538,6")
image paragraph message for exposure 1 of trigger 863053
IMAGE PROBLEM: partial overlap
WARNING -- because of the LARGE EXTINCTION, results should be used cautiously.
------ Start for Possible Stand-alone Circular ----
In response to GRB180924 (Swift/BAT trigger 863053) at 00:01:30 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 925 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 25% of
the BAT 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
BAT error circle. The list of sources is typically complete to about 18 mag. No
correction has been made for the large, but uncertain, extinction expected.
------- notes for trigger 863053 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 180924d00h25m52s906540usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=863053
-expid=559441037 -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/863053/
Links to data for all triggers can be found at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/
Unreliable extinction found for bat position. No XRT position found for
srclist. No XRT position found for Genie image. BAT position found.
UVOT exposure began at MET 559441037.93196 or about 2018:267:00:17:12 UT
Found 1041 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 19% of the srclist region. Found 155 sources in
srclist catalog. Found 66 srclist source(s) without IDs. There are 0 good
candidate(s) in the srclist catalog. Good candidates must be brighter than
18.66 mag.
Found 12 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 19.56 mag. Found 136 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
13% of the Genie image region.
Genie image analysis:
Found 160841.9 counts in the large background region of 5986.0 pixels or a rate
of 26.870 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 19.56 mag. for a
4-arcsec aperture.
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?
559441037 925 WHITE 267.53369 -31.76468 18.98/18.7 123.7 srclist Yes
559441037 925 WHITE 267.52374 -31.74425 18.98/18.7 174.3 srclist Yes
559441037 925 WHITE 267.51654 -31.75249 19.60/18.7 183.5 srclist Yes
559441037 925 WHITE image found no candidates.
List afterglow candidates for other finding charts.
------- Tokens for Quick GCN -------
CATALOG_TYPE: SRCLIST
FILTER: white
GRB_DEC: -31.76700
GRB_ERROR: 200
GRB_RA: 267.57400
IMAGE_START_TIME: 00:17:12
MAGNITUDE: 18.0
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: BAT