srclist overlap message for exposure 3 of trigger 852903
uvot_overlap.pl vrs. 2010-12-20b fem started at 180812d12h31m44s521800usUT
The observation of trigger 852903 started 2018-08-12T08:37:24.4
Examining file ./852903_g893_uvot_sky_srclist.fits
The exposure ID is 555755844
The exposure time is undefined.
The filter is WHITE.
The uvot region is centered at (245.8673,74.6706) with a roll angle of 287.2
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 (245.8860,74.6700) with a radius of 3.000 arc min
This is 0.299 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 (245.8347,74.6647) with a radius of 0.028 arc min
This is 0.627 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 3 of trigger 852903
find_uvot_ag.pl vrs. 2017-02-17 fem started at 180812d12h31m57s593966usUT
Observation start time is 2018-08-12T08:37:24.4
Examining file ./852903_g893_uvot_catalog_srclist.fits
The exposure ID is 555755844
The exposure is 149.835 sec.
The bin size is 2 pixels
The filter is WHITE
There are 62 detected source(s) for 852903_g893
Aspect correction adds -0.00023 degrees (-0.056 sec of time = -0.22 arc sec) to RA
Aspect correction adds 0.00026 degrees ( 0.95 arcsec) to Dec
Total aspect correction is 0.98 arcsec
Star catalogs centered at 245.8628 , 74.6743 with radius 8.52 arc min.
n_usno: 774 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 55 matched entries is 0.565" for 852903_g893
Mean and std. dev of mag. difference (MAG_DELTA) are 1.630 and 0.316 for 852903_g893
Found 7 entries without IDs and 4 entries that are acceptable afterglow candidates for 852903_g893.
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.
Magnitude criteria will be applied later.
BAT distances are from RA=245.8860 (16:23:32.64) DEC=74.6700 (+74:40:12.0)
XRT distances are from RA=245.8347 (16:23:20.32) DEC=74.6647 (+74:39:53.0)
-----------------
Entry 3 in the list of sources is a candidate afterglow for 852903_g893 with 3x3 stamp
ra=245.96892 (16:23:52.54) dec=74.65175 (+74:39:06.3) +/- 1.1" mag=19.78+/-0.35
dist=136.2 REFID=59
*** The position of this source is inconsistent with the XRT position.
The position is 102.7 arc sec from the BAT position.
src: 3 distr. of nearby unmatched sources: 0 0 0 0 0
Found 2 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
245.9822 74.6556 18.6 -1 USNO-B1 18.87 18.71 18.78
245.9844 74.6531 15.6 -1 USNO-B1 20.94 19.66 20.22
*** If XRT position is correct, then this is NOT the afterglow
-----------------
Entry 6 in the list of sources is a candidate afterglow for 852903_g893 with 3x3 stamp
ra=245.81165 (16:23:14.80) dec=74.69995 (+74:41:59.8) +/- 1.1" mag=19.65+/-0.35
dist=128.7 REFID=58
*** The position of this source is inconsistent with the XRT position.
The position is 128.9 arc sec from the BAT position.
src: 6 distr. of nearby unmatched sources: 0 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
245.8200 74.6956 17.7 -1 USNO-B1 99.99 19.84 99.99
245.8196 74.6977 11.1 -1 USNO-B1 20.45 18.55 19.39
*** If XRT position is correct, then this is NOT the afterglow
-----------------
Entry 7 in the list of sources is a candidate afterglow for 852903_g893 with 3x3 stamp
ra=245.97890 (16:23:54.94) dec=74.64082 (+74:38:26.9) +/- 1.1" mag=19.67+/-0.35
dist=162.2 REFID=60
*** The position of this source is inconsistent with the XRT position.
The position is 137.4 arc sec from the BAT position.
src: 7 distr. of nearby unmatched sources: 0 0 0 0 0
Found 0 entries in star catalog(s) within 20.0" of the candidate.
*** If XRT position is correct, then this is NOT the afterglow
-----------------
Entry 8 in the list of sources is a candidate afterglow for 852903_g893 with 3x3 stamp
ra=246.06467 (16:24:15.52) dec=74.67984 (+74:40:47.4) +/- 1.1" mag=19.93+/-0.35
dist=225.4 REFID=62
*** The position of this source is inconsistent with the XRT position.
The position is 173.6 arc sec from the BAT position.
src: 8 distr. of nearby unmatched sources: 0 0 0 0 0
Found 0 entries in star catalog(s) within 20.0" of the candidate.
*** 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 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 3 of trigger 852903
------ Start for Possible Stand-alone Circular ----
In response to GRB180812 (Swift/BAT trigger 852903) at 08:22:30 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 872 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
0.04.
------- notes for trigger 852903 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 180812d12h31m59s472214usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=852903
-expid=555755844 -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/852903/
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 555755844.42658 or about 2018:224:08:37:19 UT
Found 770 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 7% of the srclist region. Found 62 sources in
srclist catalog. Found 7 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 4 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 20.24 mag. Found 62 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 134012.6 counts in the large background region of 6198.0 pixels or a rate
of 21.622 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 19.68 mag. for a
4-arcsec aperture.
Found 4388.9 counts in the XRT position region of 201.0 pixels or a rate of
21.835 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 0.146 +/- 0.476 (1-sigma) cps or
21.87 mag and a range from 20.30 to 99.99 mag. The 3-sigma UL at the XRT
position is 1.573 cps or 19.29 mag. The closest srclist source has ra= 245.7894
dec= 74.6595 mag=18.75 sep=47.08". The closest Genie source has ra= 245.8704
dec= 74.6731 mag=20.06 sep=45.30".
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?
555755844 872 WHITE srclist found no candidates.
555755844 872 WHITE image found no candidates.
List afterglow candidates for other finding charts.
555755084 112 WHITE srclist found no candidates.
555755084 112 WHITE 245.83501 74.66469 20.40/20.1 0.3 image Yes
555755242 270 U srclist found no candidates.
555755242 270 U image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: 74.66472
GRB_ERROR: 5
GRB_RA: 245.83467
IMAGE_START_TIME: 08:37:19
MAGNITUDE: 19.3
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT