srclist overlap message for exposure 2 of trigger 863421
uvot_overlap.pl vrs. 2010-12-20b fem started at 180925d22h21m33s631285usUT
The observation of trigger 863421 started 2018-09-25T14:42:30.0
Examining file ./863421_g297_uvot_sky_srclist.fits
The exposure ID is 559579349
The exposure time is undefined.
The filter is U.
The uvot region is centered at (315.2010,-64.4600) with a roll angle of 229.6
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 (315.2130,-64.4430) with a radius of 3.000 arc min
This is 1.064 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 0.184 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 2 of trigger 863421
find_uvot_ag.pl vrs. 2017-02-17 fem started at 180925d22h21m53s453670usUT
Observation start time is 2018-09-25T14:42:30.0
Examining file ./863421_g297_uvot_catalog_srclist.fits
The exposure ID is 559579349
The exposure is 249.935 sec.
The bin size is 2 pixels
The filter is U
There are 45 detected source(s) for 863421_g297
Aspect correction adds -0.00147 degrees (-0.353 sec of time = -2.28 arc sec) to RA
Aspect correction adds 0.00029 degrees ( 1.03 arcsec) to Dec
Total aspect correction is 2.51 arcsec
Star catalogs centered at 315.2039 , -64.4658 with radius 5.59 arc min.
n_usno: 380 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 47 matched entries is 0.742" for 863421_g297
Mean and std. dev of mag. difference (MAG_DELTA) are 1.493 and 0.998 for 863421_g297
Found 2 entries without IDs and 2 entries that are acceptable afterglow candidates for 863421_g297.
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.
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)
-----------------
Entry 10 in the list of sources is a candidate afterglow for 863421_g297 with 5x5 stamp
ra=315.29260 (21:01:10.22) dec=-64.47574 (-64:28:32.6) +/- 1.1" mag=19.91+/-0.35
dist=157.8 REFID=40
*** The position of this source is inconsistent with the XRT position.
The position is 170.7 arc sec from the BAT position.
src: 10 distr. of nearby unmatched sources: 0 1 0 0 0
Found 6 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
315.2873 -64.4760 8.3 -1 USNO-B1 20.00 19.59 19.77
315.2881 -64.4763 7.3 -1 USNO-B1 19.69 18.51 19.03
315.2896 -64.4762 5.0 -1 USNO-B1 19.40 18.55 18.93
315.2867 -64.4801 18.2 -1 USNO-B1 16.35 14.98 15.59
315.2932 -64.4771 5.0 -1 USNO-B1 20.37 13.01 16.28
315.2949 -64.4770 5.8 -1 USNO-B1 14.48 12.90 13.60 *
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 4" or brighter than 13 mag
-----------------
Entry 19 in the list of sources is a candidate afterglow for 863421_g297 with 3x3 stamp
ra=315.25468 (21:01:01.12) dec=-64.41068 (-64:24:38.4) +/- 1.1" mag=19.67+/-0.35
dist=186.3 REFID=43
*** The position of this source is inconsistent with the XRT position.
The position is 133.2 arc sec from the BAT position.
src: 19 srclist_match has ID
src: 19 distr. of nearby unmatched sources: 0 0 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
315.2537 -64.4104 1.8 -1 USNO-B1 18.18 17.27 17.67 *
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 18.12, 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 2 of trigger 863421
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 250 seconds with the U filter starting
276 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 19.2 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 18.0 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 180925d22h21m56s577361usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=863421
-expid=559579349 -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 559579349.97826 or about 2018:268:14:42:24 UT
Found 376 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 8% 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
18.12 mag.
Found 7 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
20.62 mag. Found 51 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 7% of the Genie image region.
Genie image analysis:
Found 11840.8 counts in the large background region of 5630.0 pixels or a rate
of 2.103 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 20.10 mag. for a
4-arcsec aperture.
Found 627.7 counts in the XRT position region of 202.0 pixels or a rate of
3.107 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 0.623 +/- 0.107 (1-sigma) cps or
18.89 mag and a range from 18.72 to 19.10 mag. The 3-sigma UL at the XRT
position is 0.943 cps or 18.44 mag. The closest srclist source has ra= 315.1944
dec= -64.4597 mag=14.97 sep=14.10".
Found 1 Genie source(s) within 10.0" of the XRT position. The brightest such
source has ra= 315.2021 dec= -64.4568 mag=19.17 sep=2.18". The closest Genie
source has ra= 315.2021 dec= -64.4568 mag=19.17 sep=2.18".
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 250 seconds with the U filter starting
276 seconds after the BAT trigger. There is a candidate afterglow in the
rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 21:00:48.51 = 315.20213
DEC(J2000) = -64:27:24.4 = -64.45679
with a 90%-confidence error radius of about 0.83 arc sec. This position is 2.18
arc sec. from the center of the XRT error circle. The estimated magnitude is
19.17 with a 1-sigma error of about 0.18. 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?
559579349 275 U srclist found no candidates.
559579349 275 U 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.
559579930 856 WHITE srclist found no candidates.
559579930 856 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: -64.45689
GRB_ERROR: 9.5
GRB_RA: 315.20075
IMAGE_START_TIME: 14:42:24
MAGNITUDE: 18.4
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT