srclist overlap message for exposure 2 of trigger 811686
uvot_overlap.pl vrs. 2010-12-20b fem started at 180225d20h43m40s711657usUT
The observation of trigger 811686 started 2018-02-25T20:36:48.1
Examining file 811686_g356_uvot_sky_srclist.fits
The exposure ID is 541283808
The exposure time is undefined.
The filter is U.
The uvot region is centered at (185.6114,29.2959) with a roll angle of 56.1
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 (185.6090,29.2930) with a radius of 3.000 arc min
This is 0.215 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 811686
find_uvot_ag.pl vrs. 2017-02-17 fem started at 180225d20h43m41s346580usUT
Observation start time is 2018-02-25T20:36:48.1
Examining file 811686_g356_uvot_catalog_srclist.fits
The exposure ID is 541283808
The exposure is 250.000 sec.
The bin size is 2 pixels
The filter is U
There are 52 detected source(s) for 811686_g356
Aspect correction adds 0.00041 degrees (0.099 sec of time = 1.30 arc sec) to RA
Aspect correction adds 0.00028 degrees ( 1.02 arcsec) to Dec
Total aspect correction is 1.65 arcsec
Star catalogs centered at 185.6188 , 29.2888 with radius 7.79 arc min.
n_usno: 301 n_gsc: 334
*** WARNING -- bright star catalog has 3 entries brighter than 12 mag
The brightest has mag 8.47835
RA DEC Mag Color
bright star 0: 185.60944 (12:22:26.26) 29.20874 (+29:12:31.5) 8.48 GSC-V
bright star 1: 185.60916 (12:22:26.20) 29.20844 (+29:12:30.4) 10.61 USNO-V
bright star 2: 185.60979 (12:22:26.35) 29.20755 (+29:12:27.2) 8.52 USNO-V
*** WARNING -- no XRT distances are available.
Mean distance difference (CAT_DELTA) for 30 matched entries is 0.841" for 811686_g356
Mean and std. dev of mag. difference (MAG_DELTA) are 3.156 and 3.276 for 811686_g356
Found 23 entries without IDs and 2 entries that are acceptable afterglow candidates for 811686_g356.
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.
20 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=185.6090 (12:22:26.16) DEC=29.2930 (+29:17:34.8)
XRT distances are as reported in catalog file.
*** WARNING 44 per cent of entries have no IDs.
-----------------
Entry 0 in the list of sources is a candidate afterglow for 811686_g356 with 3x3 stamp
ra=185.62366 (12:22:29.68) dec=29.31851 (+29:19:06.6) +/- 1.1" mag=19.36+/-0.35
dist=102.7 REFID=47
src: 0 distr. of nearby unmatched sources: 0 1 0 1 0
Found 5 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
185.6286 29.3165 17.0 -1 USNO-B1 16.52 15.89 16.17
185.6287 29.3182 15.8 -1 USNO-B1 16.15 99.99 99.99
185.6254 29.3192 5.9 -1 USNO-B1 13.57 12.98 13.25 *
185.6286 29.3165 17.1 -1 GSC2.3 16.05 16.97 16.23
185.6255 29.3191 6.0 -1 GSC2.3 12.90 13.72 13.08 *
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 4" or brighter than 13 mag
-----------------
Entry 1 in the list of sources is a candidate afterglow for 811686_g356 with 5x5 stamp
ra=185.62528 (12:22:30.07) dec=29.31803 (+29:19:04.9) +/- 1.1" mag=18.22+/-0.35
dist=103.6 REFID=19
src: 1 distr. of nearby unmatched sources: 0 1 1 0 0
Found 5 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
185.6286 29.3165 11.7 -1 USNO-B1 16.52 15.89 16.17
185.6287 29.3182 10.7 -1 USNO-B1 16.15 99.99 99.99
185.6254 29.3192 4.1 -1 USNO-B1 13.57 12.98 13.25 *
185.6286 29.3165 11.8 -1 GSC2.3 16.05 16.97 16.23
185.6255 29.3191 3.7 -1 GSC2.3 12.90 13.72 13.08 *
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 811686
------ Start for Possible Stand-alone Circular ----
In response to GRB180225 (Swift/BAT trigger 811686) at 20:30:51 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
336 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 0.02.
------- notes for trigger 811686 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 180225d20h43m42s284703usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=811686
-expid=541283808 -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/811686/
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. BAT position found.
UVOT exposure began at MET 541283808.07832 or about 2018:056:20:36:43 UT
Found 325 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 3% of the srclist region. Found 52 sources in
srclist catalog. Found 23 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?
541283808 336 U srclist found no candidates.
541283808 336 ? image data are not available.
List afterglow candidates for other finding charts.
541283650 178 WHITE srclist found no candidates.
541283650 178 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: SRCLIST
FILTER: u
GRB_DEC: 29.29300
GRB_ERROR: 200
GRB_RA: 185.60900
IMAGE_START_TIME: 20:36:43
MAGNITUDE: 18.0
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: BAT