srclist overlap message for exposure 2 of trigger 874754
uvot_overlap.pl vrs. 2010-12-20b fem started at 181204d20h41m11s870000usUT
The observation of trigger 874754 started 2018-12-04T20:33:46.5
Examining file 874754_g328_uvot_sky_srclist.fits
The exposure ID is 565648426
The exposure time is undefined.
The filter is U.
The uvot region is centered at (188.0871,16.3060) with a roll angle of 120.3
It is square with sides of 12.05 arc min. for an area of 145.15 sq arc min
The BAT error circle is centered at (188.0830,16.3090) with a radius of 3.000 arc min
This is 0.294 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 28.27 sq. arc min or 1.00 of the BAT error circle
Could not find the location of an XRT error circle
srclist afterglow message for exposure 2 of trigger 874754
find_uvot_ag.pl vrs. 2017-02-17 fem started at 181204d20h41m12s792051usUT
Observation start time is 2018-12-04T20:33:46.5
Examining file 874754_g328_uvot_catalog_srclist.fits
The exposure ID is 565648426
The exposure is 250.000 sec.
The bin size is 2 pixels
The filter is U
There are 22 detected source(s) for 874754_g328
Aspect correction adds 0.00031 degrees (0.076 sec of time = 1.09 arc sec) to RA
Aspect correction adds -0.00149 degrees (-5.35 arcsec) to Dec
Total aspect correction is 5.46 arcsec
Star catalogs centered at 188.0884 , 16.3268 with radius 6.66 arc min.
n_usno: 290 n_gsc: 0
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 11.80936
RA DEC Mag Color
bright star 0: 188.17038 (12:32:40.89) 16.29282 (+16:17:34.2) 11.81 USNO-V
*** WARNING -- no XRT distances are available.
Mean distance difference (CAT_DELTA) for 19 matched entries is 0.632" for 874754_g328
Mean and std. dev of mag. difference (MAG_DELTA) are 1.194 and 1.552 for 874754_g328
Found 4 entries without IDs and 2 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.
0 sources matched bright stars.
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 0 in the list of sources is a candidate afterglow for 874754_g328 with 5x5 stamp
ra=188.08946 (12:32:21.47) dec=16.30289 (+16:18:10.4) +/- 1.1" mag=18.01+/-0.35
dist=31.4 REFID=13
src: 0 distr. of nearby unmatched sources: 0 1 0 0 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 3.3 -1 USNO-B1 12.90 12.78 12.83 *
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 4" or brighter than 13 mag
-----------------
Entry 2 in the list of sources is a candidate afterglow for 874754_g328 with 5x5 stamp
ra=188.08905 (12:32:21.37) dec=16.30085 (+16:18:03.0) +/- 1.1" mag=18.65+/-0.35
dist=36.0 REFID=21
src: 2 distr. of nearby unmatched sources: 0 1 0 0 0
Found 1 entries in star catalog(s) within 20.0" of the candidate.
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
188.0899 16.3021 5.5 -1 USNO-B1 12.90 12.78 12.83 *
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 4" or brighter than 13 mag
Good candidates have no ID, acceptable profiles,
mag between 9.01 and 17.56, BAT distances < 200",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
srclist paragraph message for exposure 2 of trigger 874754
------ 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 nominal 250.000 seconds with the U filter
starting 306 seconds after the BAT trigger. No credible afterglow candidate has
been found in the initial data products. Data from the 2.7'x2.7' sub-image are
not available at this time. 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 181204d20h41m13s730536usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=874754
-expid=565648426 -msg_srclist
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/
*** Warning -- no exposure found, using srclist assumed value.
No XRT position found for srclist. 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.
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 ? image data are not available.
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