srclist overlap message for exposure 3 of trigger 863421
uvot_overlap.pl vrs. 2010-12-20b fem started at 180925d22h21m34s165287usUT
The observation of trigger 863421 started 2018-09-25T14:52:10.3
Examining file ./863421_g878_uvot_sky_srclist.fits
The exposure ID is 559579930
The exposure time is undefined.
The filter is WHITE.
The uvot region is centered at (315.1987,-64.4595) with a roll angle of 229.6
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 (315.2130,-64.4430) with a radius of 3.000 arc min
This is 1.055 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 (315.2008,-64.4569) with a radius of 0.063 arc min
This is 0.164 arc min from the center of the uvot region
The area of the XRT error circle is 0.013 sq. arc min
The UVOT/XRT overlap is 0.013 sq. arc min or 1.00 of the XRT error circle
srclist afterglow message for exposure 3 of trigger 863421
find_uvot_ag.pl vrs. 2017-02-17 fem started at 180925d22h21m59s796067usUT
Observation start time is 2018-09-25T14:52:10.3
Examining file ./863421_g878_uvot_catalog_srclist.fits
The exposure ID is 559579930
The exposure is 149.868 sec.
The bin size is 2 pixels
The filter is WHITE
There are 186 detected source(s) for 863421_g878
Aspect correction adds -0.00147 degrees (-0.353 sec of time = -2.29 arc sec) to RA
Aspect correction adds 0.00030 degrees ( 1.07 arcsec) to Dec
Total aspect correction is 2.52 arcsec
Star catalogs centered at 315.2069 , -64.4562 with radius 9.16 arc min.
n_usno: 1134 n_gsc: 0
*** WARNING -- bright star catalog has 4 entries brighter than 12 mag
The brightest has mag 10.36266
RA DEC Mag Color
bright star 0: 314.97754 (20:59:54.61) -64.39657 (-64:23:47.7) 11.60 USNO-B
bright star 1: 314.97496 (20:59:53.99) -64.39719 (-64:23:49.9) 11.11 USNO-B
bright star 2: 315.40519 (21:01:37.24) -64.54005 (-64:32:24.2) 10.36 USNO-V
bright star 3: 314.93587 (20:59:44.61) -64.50779 (-64:30:28.0) 10.55 USNO-V
Mean distance difference (CAT_DELTA) for 148 matched entries is 0.872" for 863421_g878
Mean and std. dev of mag. difference (MAG_DELTA) are 1.461 and 1.019 for 863421_g878
Found 52 entries without IDs and 1 entries that are acceptable afterglow candidates for 863421_g878.
Acceptable entries have no ID, XRT distances < 9.5", and are > 0.8*(80 - 10*(mag-6))" from any bright star
from any bright star and >21.6" from other rejected sources.
42 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=315.2130 (21:00:51.12) DEC=-64.4430 (-64:26:34.8)
XRT distances are from RA=315.2008 (21:00:48.18) DEC=-64.4569 (-64:27:24.8)
*** WARNING 27 per cent of entries have no IDs.
-----------------
Entry 14 in the list of sources is a candidate afterglow for 863421_g878 with 1x1 stamp
ra=315.14305 (21:00:34.33) dec=-64.43297 (-64:25:58.7) +/- 1.1" mag=19.60+/-0.35
dist=124.3 REFID=184
*** The position of this source is inconsistent with the XRT position.
The position is 114.5 arc sec from the BAT position.
src: 14 distr. of nearby unmatched sources: 0 0 0 0 0
Found 4 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
315.1536 -64.4335 16.5 -1 USNO-B1 20.66 19.54 20.03
315.1437 -64.4337 2.9 -1 USNO-B1 17.47 16.32 16.83 *
315.1354 -64.4366 17.8 -1 USNO-B1 20.31 18.06 19.06
315.1380 -64.4305 12.0 -1 USNO-B1 19.56 18.71 19.09
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:
There are no candidates inside BAT error circle, but outside XRT error circle.
Good candidates have no ID, acceptable profiles,
mag between 9.01 and 19.22, XRT distances < 9.5",
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 3 of trigger 863421
SRCLIST PROBLEM: srclist filled telemetry buffer
1 source(s) near the XRT position were rejected as afterglow candidate(s). See
notes for details.
------ Start for Possible Stand-alone Circular ----
In response to GRB180925 (Swift/BAT trigger 863421) at 14:37:31 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 856 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 coverage of the XRT error circle by the 8'x8' region for the list of
sources generated on-board is uncertain because the large number of sources
filled the available telemetry. 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 863421 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 180925d22h22m03s031287usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=863421
-expid=559579930 -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/863421/
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 559579930.27666 or about 2018:268:14:52:05 UT
Found 1130 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 9% of the srclist region. Found 186 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 52 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 10 source(s) in Genie image catalog. 1 source(s) are within 10.0" of the
xrt position. 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
20.79 mag. Found 50 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 7% of the Genie image region. The
Genie image is INCOMPLETE with 7899 null pixels.
Genie image analysis:
Found 37682.2 counts in the large background region of 4824.0 pixels or a rate
of 7.811 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 20.23 mag. for a
4-arcsec aperture.
Found 2040.6 counts in the XRT position region of 198.0 pixels or a rate of
10.306 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 2.639 +/- 0.327 (1-sigma) cps or
18.73 mag and a range from 18.60 to 18.87 mag. The 3-sigma UL at the XRT
position is 3.619 cps or 18.38 mag. The number of srclist sources filled the
available telemetry. The weakest source detected was 19.65 mag. The closest
srclist source has ra= 315.2061 dec= -64.4595 mag=19.51 sep=12.52".
Found 1 Genie source(s) within 10.0" of the XRT position. The brightest such
source has ra= 315.2020 dec= -64.4570 mag=19.56 sep=1.98". The closest Genie
source has ra= 315.2020 dec= -64.4570 mag=19.56 sep=1.98".
Report rejected UVOT sources within 10 arcsec XRT position.
Such sources are usually NOT the afterglow.
****THIS SOURCE NEAR XRT POSITION WAS REJECTED--USE WITH CAUTION****
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 856 seconds after the BAT trigger. There is a candidate afterglow in
the rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 21:00:48.48 = 315.20199
DEC(J2000) = -64:27:25.2 = -64.45701
with a 90%-confidence error radius of about 0.66 arc sec. This position is 1.98
arc sec. from the center of the XRT error circle. The estimated magnitude is
19.56 with a 1-sigma error of about 0.16. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.03.
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?
559579930 856 WHITE srclist found no candidates.
559579930 856 WHITE image found no candidates.
List afterglow candidates for other finding charts.
559579192 118 WHITE srclist found no candidates.
559579192 118 WHITE image found no candidates.
559579349 275 U srclist found no candidates.
559579349 275 U image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: -64.45689
GRB_ERROR: 9.5
GRB_RA: 315.20075
IMAGE_START_TIME: 14:52:05
MAGNITUDE: 18.4
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT