image overlap message for exposure 1 of trigger 874754
uvot_overlap.pl vrs. 2010-12-20b fem started at 181204d20h37m09s500695usUT
The observation of trigger 874754 started 2018-12-04T20:31:07.3
Examining file 874754_g169_uvot_sky_image.fits
The exposure ID is 565648267
The exposure time is 149.857 (seconds)
The filter is WHITE.
The uvot region is centered at (188.0869,16.3033) 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 0.408 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 874754
find_uvot_ag.pl vrs. 2017-02-17 fem started at 181204d20h37m10s470393usUT
Observation start time is 2018-12-04T20:31:07.3
Examining file 874754_g169_uvot_catalog_image.fits
The exposure ID is 565648267
The exposure is 149.857 sec.
The bin size is 2 pixels
The filter is WHITE
There are 9 detected source(s) for 874754_g169
Aspect correction adds 0.00054 degrees (0.129 sec of time = 1.85 arc sec) to RA
Aspect correction adds -0.00096 degrees (-3.44 arcsec) to Dec
Total aspect correction is 3.91 arcsec
Star catalogs centered at 188.0855 , 16.2976 with radius 2.64 arc min.
n_usno: 66 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 10 matched entries is 0.443" for 874754_g169
Mean and std. dev of mag. difference (MAG_DELTA) are 1.192 and 1.221 for 874754_g169
Found 1 entries without IDs and 1 entries that are acceptable afterglow candidates for 874754_g169.
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.
-----------------
Entry 5 in the list of sources is a candidate afterglow for 874754_g169 with genie
ra=188.09405 (12:32:22.57) dec=16.30224 (+16:18:08.1) +/- 1.0" mag=20.73+/-0.31
dist=45.3 REFID=7 major=1.3 minor=1.1 flag=0
Found 1 entries in star catalog(s) within 20.0" of the candidate.
printing all entries
(Entries within 2 arc sec of a source list entry are considered a match)
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
188.0899 16.3021 14.2 -1 USNO-B1 12.90 12.78 12.83
uvot_check_outside found 13 of 13 good pixels
##### This source remains a candidate #####
It has no entries within 3.5" or brighter than 12 mag
There are 1.0953653E+05 counts in the bkg source region of 5971.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 18.345 counts/pixel (5-sig UL in 4" is 19.77 mag) for 874754_g169
Good candidates have no ID, acceptable profiles,
mag between 9.01 and 19.76, 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_565648267_181204d20h37m10s470393usUT_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(188.0869,16.3033,45")
fk5;-circle(188.089951482938,16.3021237868318,6")
fk5;-circle(188.094933313802,16.309749117654,6")
fk5;-circle(188.094046201421,16.3022364979323,6")
image paragraph message for exposure 1 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 150 seconds with the White filter
starting 147 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 expected extinction corresponding to E(B-V) of
0.03.
------- notes for trigger 874754 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 181204d20h37m24s953742usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=874754
-expid=565648267 -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 565648267.25766 or about 2018:338:20:31:02 UT
Found 203 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 3 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 9 source(s) in Genie image catalog. Found 1 Genie image source(s) without
IDs. There are 0 good candidate(s) in the Genie image catalog. Good candidates
must be brighter than 19.76 mag. Found 62 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 109536.5 counts in the large background region of 5971.0 pixels or a rate
of 18.345 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 19.77 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?
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
List afterglow candidates for other finding charts.
------- Tokens for Quick GCN -------
CATALOG_TYPE: SRCLIST
FILTER: white
GRB_DEC: 16.30900
GRB_ERROR: 200
GRB_RA: 188.08300
IMAGE_START_TIME: 20:31:02
MAGNITUDE: 18.0
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: BAT