srclist overlap message for exposure 2 of trigger 922808
uvot_overlap.pl vrs. 2010-12-20b fem started at 190828d16h08m56s458541usUT
The observation of trigger 922808 started 2019-08-28T13:04:58.0
Examining file ./922808_g297_uvot_sky_srclist.fits
The exposure ID is 588690297
The exposure time is undefined.
The filter is U.
The uvot region is centered at (251.8287,27.2791) with a roll angle of 280.9
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 (251.8180,27.2370) with a radius of 3.000 arc min
This is 2.589 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 23.62 sq. arc min or 0.84 of the BAT error circle
The XRT error circle is centered at (251.8313,27.2809) with a radius of 0.028 arc min
This is 0.177 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 2 of trigger 922808
find_uvot_ag.pl vrs. 2017-02-17 fem started at 190828d16h09m11s879800usUT
Observation start time is 2019-08-28T13:04:58.0
Examining file ./922808_g297_uvot_catalog_srclist.fits
The exposure ID is 588690297
The exposure is 249.935 sec.
The bin size is 2 pixels
The filter is U
There are 82 detected source(s) for 922808_g297
Aspect correction adds -0.00200 degrees (-0.481 sec of time = -6.41 arc sec) to RA
Aspect correction adds -0.00052 degrees (-1.88 arcsec) to Dec
Total aspect correction is 6.68 arcsec
Star catalogs centered at 251.8219 , 27.2811 with radius 5.65 arc min.
n_usno: 433 n_gsc: 0
*** WARNING -- bright star catalog has 2 entries brighter than 12 mag
The brightest has mag 10.2782
RA DEC Mag Color
bright star 0: 251.82517 (16:47:18.04) 27.24234 (+27:14:32.4) 11.53 USNO-V
bright star 1: 251.82614 (16:47:18.27) 27.23836 (+27:14:18.1) 10.28 USNO-V
Mean distance difference (CAT_DELTA) for 43 matched entries is 0.761" for 922808_g297
Mean and std. dev of mag. difference (MAG_DELTA) are 2.068 and 1.177 for 922808_g297
Found 39 entries without IDs and 1 entries that are acceptable afterglow candidates for 922808_g297.
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.
36 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=251.8180 (16:47:16.32) DEC=27.2370 (+27:14:13.2)
XRT distances are from RA=251.8313 (16:47:19.51) DEC=27.2809 (+27:16:51.3)
*** WARNING 47 per cent of entries have no IDs.
-----------------
Entry 3 in the list of sources is a candidate afterglow for 922808_g297 with 3x3 stamp
ra=251.80045 (16:47:12.11) dec=27.27756 (+27:16:39.2) +/- 1.1" mag=19.98+/-0.35
dist=99.4 REFID=81
*** The position of this source is inconsistent with the XRT position.
The position is 156.5 arc sec from the BAT position.
src: 3 distr. of nearby unmatched sources: 0 0 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
251.7965 27.2771 12.8 -1 USNO-B1 14.80 13.34 13.99
*** If XRT position is correct, then this is NOT the afterglow
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 18.12, 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 2 of trigger 922808
------ Start for Possible Stand-alone Circular ----
In response to GRB190828 (Swift/BAT trigger 922808) at 12:59:59 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
275 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
0.10.
------- notes for trigger 922808 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 190828d16h09m19s270485usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=922808
-expid=588690297 -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/922808/
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 588690297.97034 or about 2019:240:13:04:52 UT
Found 429 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 9% of the srclist region. Found 82 sources in
srclist catalog. Found 39 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 3 source(s) in Genie image catalog. Found 0 Genie image source(s) without
IDs. There are 0 good candidate(s) in the Genie image catalog. Good candidates
must be brighter than 20.76 mag. Found 72 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 10158.4 counts in the large background region of 6305.0 pixels or a rate
of 1.611 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 20.25 mag. for a
4-arcsec aperture.
Found 309.5 counts in the XRT position region of 196.0 pixels or a rate of
1.579 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is -0.034 +/- 0.076 (1-sigma) cps. The
3-sigma UL at the XRT position is 0.227 cps or 19.99 mag. The closest srclist
source has ra= 251.8446 dec= 27.2760 mag=19.29 sep=46.19". The closest Genie
source has ra= 251.8448 dec= 27.2760 mag=19.00 sep=46.81".
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?
588690297 274 U srclist found no candidates.
588690297 274 U image found no candidates.
List afterglow candidates for other finding charts.
588690085 62 WHITE srclist found no candidates.
588690085 62 WHITE image found no candidates.
588690899 876 WHITE srclist found no candidates.
588690899 876 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: 27.28092
GRB_ERROR: 5
GRB_RA: 251.83129
IMAGE_START_TIME: 13:04:52
MAGNITUDE: 20.0
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT