image overlap message for exposure 2 of trigger 874754
uvot_overlap.pl vrs. 2010-12-20b fem started at 181204d20h43m15s252611usUT
The observation of trigger 874754 started 2018-12-04T20:33:46.5
Examining file 874754_g328_uvot_sky_image.fits
The exposure ID is 565648426
The exposure time is 249.935 (seconds)
The filter is U.
The uvot region is centered at (188.0868,16.3071) with a roll angle of 120.3
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 (188.0830,16.3090) with a radius of 3.000 arc min
This is 0.248 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 2 of trigger 874754
find_uvot_ag.pl vrs. 2017-02-17 fem started at 181204d20h43m16s227746usUT
Observation start time is 2018-12-04T20:33:46.5
Examining file 874754_g328_uvot_catalog_image.fits
The exposure ID is 565648426
The exposure is 249.935 sec.
The bin size is 2 pixels
The filter is U
There are 5 detected source(s) for 874754_g328
Aspect correction adds 0.00035 degrees (0.083 sec of time = 1.20 arc sec) to RA
Aspect correction adds -0.00152 degrees (-5.48 arcsec) to Dec
Total aspect correction is 5.61 arcsec
Star catalogs centered at 188.0887 , 16.3038 with radius 2.50 arc min.
n_usno: 58 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
*** WARNING -- no XRT distances are available.
Mean distance difference (CAT_DELTA) for 7 matched entries is 0.421" for 874754_g328
Mean and std. dev of mag. difference (MAG_DELTA) are 1.458 and 1.474 for 874754_g328
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 874754_g328.
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.
Magnitude criteria will be applied later.
BAT distances are from RA=188.0830 (12:32:19.92) DEC=16.3090 (+16:18:32.4)
XRT distances are as reported in catalog file.
There are 46375.547 counts in the bkg source region of 6035.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 7.684 counts/pixel (5-sig UL in 4" is 19.36 mag) for 874754_g328
Good candidates have no ID, acceptable profiles,
mag between 9.01 and 19.35, 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: 874754_565648426_181204d20h43m16s227746usUT_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(188.0868,16.3071,45")
fk5;-circle(188.075922752639,16.3142244464908,6")
fk5;-circle(188.089985192168,16.3020781505995,6")
fk5;-circle(188.094982342598,16.3097635052503,6")
image paragraph message for exposure 2 of trigger 874754
IMAGE PROBLEM: partial overlap
------ Start for Possible Stand-alone Circular ----
In response to GRB181204 (Swift/BAT trigger 874754) at 20:28:17 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
306 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 19.2 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 18.0 mag. No
correction has been made for the expected extinction corresponding to E(B-V) of
0.03.
------- notes for trigger 874754 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 181204d20h43m17s242088usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=874754
-expid=565648426 -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/874754/
Links to data for all triggers can be found at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/
No XRT position found for srclist. No XRT position found for Genie image. BAT
position found.
UVOT exposure began at MET 565648426.5289 or about 2018:338:20:33:41 UT
Found 286 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 4% of the srclist region. Found 22 sources in
srclist catalog. Found 4 srclist source(s) without IDs. There are 0 good
candidate(s) in the srclist catalog. Good candidates must be brighter than
17.56 mag.
Found 5 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 19.35 mag. Found 54 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 6% of the
Genie image region.
Genie image analysis:
Found 46375.5 counts in the large background region of 6035.0 pixels or a rate
of 7.684 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 19.40 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?
565648426 306 U srclist found no candidates.
565648426 306 U image found no candidates.
List afterglow candidates for other finding charts.
565648267 147 WHITE 188.06263 16.30199 20.07/18.7 74.8 srclist Yes
565648267 147 WHITE 188.09405 16.30224 20.73/19.8 45.3 image Yes
------- Tokens for Quick GCN -------
CATALOG_TYPE: SRCLIST
FILTER: u
GRB_DEC: 16.30900
GRB_ERROR: 200
GRB_RA: 188.08300
IMAGE_START_TIME: 20:33:41
MAGNITUDE: 18.0
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: BAT