srclist overlap message for exposure 2 of trigger 846868
uvot_overlap.pl vrs. 2010-12-20b fem started at 180709d14h27m36s264402usUT
The observation of trigger 846868 started 2018-07-09T10:56:54.4
Examining file ./846868_g293_uvot_sky_srclist.fits
The exposure ID is 552826614
The exposure time is undefined.
The filter is U.
The uvot region is centered at (38.1220,60.3504) with a roll angle of 95.2
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 (38.1190,60.3720) with a radius of 3.000 arc min
This is 1.300 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 28.46 sq. arc min or 1.01 of the BAT error circle
The XRT error circle is centered at (38.1178,60.3491) with a radius of 0.030 arc min
This is 0.144 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 846868
find_uvot_ag.pl vrs. 2017-02-17 fem started at 180709d14h27m54s962540usUT
Observation start time is 2018-07-09T10:56:54.4
Examining file ./846868_g293_uvot_catalog_srclist.fits
The exposure ID is 552826614
The exposure is 249.935 sec.
The bin size is 2 pixels
The filter is U
There are 14 detected source(s) for 846868_g293
Aspect correction adds 0.00079 degrees (0.190 sec of time = 1.41 arc sec) to RA
Aspect correction adds 0.00068 degrees ( 2.46 arcsec) to Dec
Total aspect correction is 2.83 arcsec
Star catalogs centered at 38.1004 , 60.3631 with radius 5.29 arc min.
n_usno: 359 n_gsc: 532
*** WARNING -- bright star catalog has 2 entries brighter than 12 mag
The brightest has mag 11.7395
RA DEC Mag Color
bright star 0: 38.00804 (02:32:01.93) 60.40129 (+60:24:04.7) 11.88 USNO-V
bright star 1: 37.96861 (02:31:52.47) 60.39902 (+60:23:56.5) 11.74 GSC-V
Mean distance difference (CAT_DELTA) for 12 matched entries is 0.604" for 846868_g293
Mean and std. dev of mag. difference (MAG_DELTA) are 1.864 and 0.466 for 846868_g293
Found 2 entries without IDs and 2 entries that are acceptable afterglow candidates for 846868_g293.
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=38.1190 (02:32:28.56) DEC=60.3720 (+60:22:19.2)
XRT distances are from RA=38.1178 (02:32:28.28) DEC=60.3491 (+60:20:56.8)
-----------------
Entry 4 in the list of sources is a candidate afterglow for 846868_g293 with 5x5 stamp
ra=38.20832 (02:32:50.00) dec=60.36100 (+60:21:39.6) +/- 1.1" mag=19.24+/-0.35
dist=166.7 REFID=13
*** The position of this source is inconsistent with the XRT position.
The position is 163.9 arc sec from the BAT position.
src: 4 distr. of nearby unmatched sources: 1 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
38.2014 60.3569 19.1 -1 USNO-B1 19.74 17.19 18.32
38.2106 60.3618 4.9 -1 USNO-B1 13.75 11.90 12.72 *
38.2014 60.3567 19.6 -1 GSC2.3 17.09 19.40 18.03
38.2108 60.3617 4.9 -1 GSC2.3 11.49 13.05 12.18 *
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 4" or brighter than 13 mag
-----------------
Entry 5 in the list of sources is a candidate afterglow for 846868_g293 with 5x5 stamp
ra=38.21066 (02:32:50.56) dec=60.36029 (+60:21:37.0) +/- 1.1" mag=19.46+/-0.35
dist=170.1 REFID=14
*** The position of this source is inconsistent with the XRT position.
The position is 168.5 arc sec from the BAT position.
src: 5 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
38.2106 60.3618 5.3 -1 USNO-B1 13.75 11.90 12.72 *
38.2108 60.3617 5.0 -1 GSC2.3 11.49 13.05 12.18 *
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 < 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 846868
WARNING -- because of the LARGE EXTINCTION, results should be used cautiously.
------ Start for Possible Stand-alone Circular ----
In response to GRB180709 (Swift/BAT trigger 846868) at 10:52:00 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
272 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 large, but uncertain, extinction expected.
------- notes for trigger 846868 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 180709d14h27m57s464362usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=846868
-expid=552826614 -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/846868/
Links to data for all triggers can be found at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/
Large extinction of 9.58 found for bat position. Unreliable extinction found
for xrt position. XRT position found for srclist. XRT position found for Genie
image. BAT position found.
UVOT exposure began at MET 552826614.44406 or about 2018:190:10:56:49 UT
Found 401 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 9% of the srclist region. Found 14 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 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 20.18 mag. Found 68 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 9% of the
Genie image region.
Genie image analysis:
Found 29534.9 counts in the large background region of 6308.0 pixels or a rate
of 4.682 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 19.67 mag. for a
4-arcsec aperture.
Found 887.5 counts in the XRT position region of 196.0 pixels or a rate of
4.528 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is -0.074 +/- 0.128 (1-sigma) cps. The
3-sigma UL at the XRT position is 0.385 cps or 19.42 mag. The closest srclist
source has ra= 38.1099 dec= 60.3362 mag=16.91 sep=48.49". The closest Genie
source has ra= 38.1101 dec= 60.3364 mag=16.17 sep=47.73".
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?
552826614 272 U srclist found no candidates.
552826614 272 U image found no candidates.
List afterglow candidates for other finding charts.
552826455 113 WHITE srclist found no candidates.
552826455 113 WHITE image found no candidates.
552827217 875 WHITE srclist found no candidates.
552827217 875 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: 60.34911
GRB_ERROR: 5
GRB_RA: 38.11783
IMAGE_START_TIME: 10:56:49
MAGNITUDE: 19.4
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT