srclist overlap message for exposure 1 of trigger 828672
uvot_overlap.pl vrs. 2010-12-20b fem started at 180425d09h09m13s125751usUT
The observation of trigger 828672 started 2018-04-25T06:48:10.6
Examining file ./828672_g108_uvot_sky_srclist.fits
The exposure ID is 546331690
The exposure time is undefined.
The filter is WHITE.
The uvot region is centered at (64.4627,-32.9498) with a roll angle of 321.4
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 (64.4690,-32.9560) with a radius of 3.000 arc min
This is 0.487 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 (64.4516,-32.9522) with a radius of 0.030 arc min
This is 0.577 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 1 of trigger 828672
find_uvot_ag.pl vrs. 2017-02-17 fem started at 180425d09h09m16s740859usUT
Observation start time is 2018-04-25T06:48:10.6
Examining file ./828672_g108_uvot_catalog_srclist.fits
The exposure ID is 546331690
The exposure is 149.669 sec.
The bin size is 2 pixels
The filter is WHITE
There are 37 detected source(s) for 828672_g108
Aspect correction adds -0.00039 degrees (-0.093 sec of time = -1.17 arc sec) to RA
Aspect correction adds 0.00003 degrees ( 0.09 arcsec) to Dec
Total aspect correction is 1.17 arcsec
Star catalogs centered at 64.4475 , -32.9611 with radius 6.06 arc min.
n_usno: 345 n_gsc: 332
*** WARNING -- bright star catalog has 3 entries brighter than 12 mag
The brightest has mag 11.44366
RA DEC Mag Color
bright star 0: 64.51124 (04:18:02.70) -32.97152 (-32:58:17.5) 11.44 USNO-V
bright star 1: 64.41378 (04:17:39.31) -33.02977 (-33:01:47.2) 11.66 USNO-V
bright star 2: 64.37280 (04:17:29.47) -32.88650 (-32:53:11.4) 11.91 GSC-F
Mean distance difference (CAT_DELTA) for 16 matched entries is 0.763" for 828672_g108
Mean and std. dev of mag. difference (MAG_DELTA) are 0.926 and 1.190 for 828672_g108
Found 22 entries without IDs and 1 entries that are acceptable afterglow candidates for 828672_g108.
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.
21 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=64.4690 (04:17:52.56) DEC=-32.9560 (-32:57:21.6)
XRT distances are from RA=64.4516 (04:17:48.38) DEC=-32.9522 (-32:57:07.8)
*** WARNING 59 per cent of entries have no IDs.
-----------------
Entry 3 in the list of sources is a candidate afterglow for 828672_g108 with 5x5 stamp
ra=64.44554 (04:17:46.93) dec=-32.93523 (-32:56:06.8) +/- 1.1" mag=20.74+/-0.35
dist=63.6 REFID=37
*** The position of this source is inconsistent with the XRT position.
The position is 103.0 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
64.4470 -32.9397 16.8 -1 GSC2.3 99.99 99.99 99.99
*** 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 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 1 of trigger 828672
------ Start for Possible Stand-alone Circular ----
In response to GRB180425 (Swift/BAT trigger 828672) at 06:46:21 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 87 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
0.03.
------- notes for trigger 828672 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 180425d09h09m19s769452usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=828672
-expid=546331690 -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/828672/
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 546331690.59736 or about 2018:115:06:48:05 UT
Found 341 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 6% of the srclist region. Found 37 sources in
srclist catalog. Found 22 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 5 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 20.73 mag. Found 73 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 6% of the
Genie image region.
Genie image analysis:
Found 52660.1 counts in the large background region of 6083.0 pixels or a rate
of 8.657 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 20.18 mag. for a
4-arcsec aperture.
Found 1731.8 counts in the XRT position region of 199.0 pixels or a rate of
8.703 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 0.019 +/- 0.300 (1-sigma) cps or
24.06 mag and a range from 21.02 to 99.99 mag. The 3-sigma UL at the XRT
position is 0.918 cps or 19.87 mag. The closest srclist source has ra= 64.4569
dec= -32.9600 mag=19.20 sep=32.39". The closest Genie source has ra= 64.4470
dec= -32.9463 mag=20.71 sep=25.19".
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?
546331690 87 WHITE srclist found no candidates.
546331690 87 WHITE image found no candidates.
List afterglow candidates for other finding charts.
546331904 301 U srclist found no candidates.
546331904 301 U image found no candidates.
546332481 878 WHITE srclist found no candidates.
546332481 878 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: -32.95217
GRB_ERROR: 5
GRB_RA: 64.45158
IMAGE_START_TIME: 06:48:05
MAGNITUDE: 19.9
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT