srclist overlap message for exposure 1 of trigger 868427
uvot_overlap.pl vrs. 2010-12-20b fem started at 181023d05h01m05s093449usUT
The observation of trigger 868427 started 2018-10-23T02:07:43.6
Examining file ./868427_g220_uvot_sky_srclist.fits
The exposure ID is 561953263
The exposure time is undefined.
The filter is WHITE.
The uvot region is centered at (248.3231,19.5607) with a roll angle of 235.9
It is square with sides of 8.03 arc min. for an area of 64.51 sq arc min
The BAT error circle is centered at (248.3290,19.5640) with a radius of 3.000 arc min
This is 0.387 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
The XRT error circle is centered at (248.3287,19.5706) with a radius of 0.028 arc min
This is 0.672 arc min from the center of the uvot region
The area of the XRT error circle is 0.003 sq. arc min
The UVOT/XRT overlap is 0.003 sq. arc min or 1.00 of the XRT error circle
srclist afterglow message for exposure 1 of trigger 868427
find_uvot_ag.pl vrs. 2017-02-17 fem started at 181023d05h01m08s047569usUT
Observation start time is 2018-10-23T02:07:43.6
Examining file ./868427_g220_uvot_catalog_srclist.fits
The exposure ID is 561953263
The exposure is 149.868 sec.
The bin size is 2 pixels
The filter is WHITE
There are 45 detected source(s) for 868427_g220
Aspect correction adds -0.00058 degrees (-0.140 sec of time = -1.98 arc sec) to RA
Aspect correction adds -0.00078 degrees (-2.79 arcsec) to Dec
Total aspect correction is 3.42 arcsec
Star catalogs centered at 248.3284 , 19.5579 with radius 6.47 arc min.
n_usno: 422 n_gsc: 0
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 10.85366
RA DEC Mag Color
bright star 0: 248.40602 (16:33:37.44) 19.59539 (+19:35:43.4) 10.85 USNO-V
Mean distance difference (CAT_DELTA) for 45 matched entries is 0.615" for 868427_g220
Mean and std. dev of mag. difference (MAG_DELTA) are 1.133 and 0.504 for 868427_g220
Found 2 entries without IDs and 2 entries that are acceptable afterglow candidates for 868427_g220.
Acceptable entries have no ID, XRT distances < 5", 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=248.3290 (16:33:18.96) DEC=19.5640 (+19:33:50.4)
XRT distances are from RA=248.3287 (16:33:18.89) DEC=19.5706 (+19:34:14.2)
-----------------
Entry 5 in the list of sources is a candidate afterglow for 868427_g220 with 3x3 stamp
ra=248.31662 (16:33:15.99) dec=19.58348 (+19:35:00.5) +/- 1.1" mag=20.00+/-0.35
dist=61.9 REFID=45
*** The position of this source is inconsistent with the XRT position.
The position is 81.7 arc sec from the BAT position.
src: 5 distr. of nearby unmatched sources: 0 0 0 0 0
Found 0 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)
*** If XRT position is correct, then this is NOT the afterglow
-----------------
Entry 31 in the list of sources is a candidate afterglow for 868427_g220 with 5x5 stamp
ra=248.29145 (16:33:09.95) dec=19.52442 (+19:31:27.9) +/- 1.1" mag=15.12+/-0.35
dist=208.9 REFID=2
*** The position of this source is inconsistent with the XRT position.
The position is 191.1 arc sec from the BAT position.
src: 31 distr. of nearby unmatched sources: 1 0 0 0 0
Found 2 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
248.2943 19.5258 10.8 -1 USNO-B1 19.84 18.53 19.11
248.2925 19.5238 4.2 -1 USNO-B1 13.41 12.02 12.63 *
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 4" or brighter than 13 mag
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
Good candidates have no ID, acceptable profiles,
mag between 9.01 and 19.22, XRT distances < 5",
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 1 of trigger 868427
------ Start for Possible Stand-alone Circular ----
In response to GRB181023 (Swift/BAT trigger 868427) at 02:04:02 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 199 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 100% of
the XRT 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
XRT 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
0.05.
------- notes for trigger 868427 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 181023d05h01m11s404957usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=868427
-expid=561953263 -meonly -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/868427/
Links to data for all triggers can be found at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/
XRT position found for srclist. XRT position found for Genie image. BAT
position found.
UVOT exposure began at MET 561953263.5938 or about 2018:296:02:07:38 UT
Found 418 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 6% of the srclist region. Found 45 sources in
srclist catalog. Found 2 srclist source(s) without IDs. There are 0 good
candidate(s) in the srclist catalog. Good candidates must be brighter than
19.22 mag.
Found 8 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 20.35 mag. Found 80 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 8% of the
Genie image region.
Genie image analysis:
Found 105393.7 counts in the large background region of 6028.0 pixels or a rate
of 17.484 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 19.80 mag. for a
4-arcsec aperture.
Found 3500.7 counts in the XRT position region of 202.0 pixels or a rate of
17.330 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is -0.044 +/- 0.427 (1-sigma) cps. The
3-sigma UL at the XRT position is 1.282 cps or 19.51 mag. The closest srclist
source has ra= 248.3368 dec= 19.5624 mag=18.81 sep=40.30". The closest Genie
source has ra= 248.3227 dec= 19.5680 mag=19.50 sep=22.45".
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?
561953263 199 WHITE srclist found no candidates.
561953263 199 WHITE image found no candidates.
List afterglow candidates for other finding charts.
561953944 880 WHITE srclist found no candidates.
561953944 880 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: 19.57061
GRB_ERROR: 5
GRB_RA: 248.32871
IMAGE_START_TIME: 02:07:38
MAGNITUDE: 19.5
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT