image overlap message for exposure 2 of trigger 820513
uvot_overlap.pl vrs. 2010-12-20b fem started at 180331d19h16m53s323667usUT
The observation of trigger 820513 started 2018-03-31T15:53:35.0
Examining file ./820513_g894_uvot_sky_image.fits
The exposure ID is 544204414
The exposure time is 149.868 (seconds)
The filter is WHITE.
The uvot region is centered at (196.8178,61.7298) with a roll angle of 7.4
It is square with sides of 2.68 arc min. for an area of 7.17 sq arc min
The BAT error circle is centered at (196.8200,61.7250) with a radius of 3.000 arc min
This is 0.295 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 7.17 sq. arc min or 0.25 of the BAT error circle
The XRT error circle is centered at (196.7834,61.7263) with a radius of 0.030 arc min
This is 1.001 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
image afterglow message for exposure 2 of trigger 820513
find_uvot_ag.pl vrs. 2017-02-17 fem started at 180331d19h17m02s288548usUT
Observation start time is 2018-03-31T15:53:35.0
Examining file ./820513_g894_uvot_catalog_image.fits
The exposure ID is 544204414
The exposure is 149.868 sec.
The bin size is 2 pixels
The filter is WHITE
There are 6 detected source(s) for 820513_g894
Aspect correction adds 0.00110 degrees (0.263 sec of time = 1.87 arc sec) to RA
Aspect correction adds 0.00021 degrees ( 0.75 arcsec) to Dec
Total aspect correction is 2.02 arcsec
Star catalogs centered at 196.8119 , 61.7262 with radius 2.39 arc min.
n_usno: 50 n_gsc: 40
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 7 matched entries is 0.753" for 820513_g894
Mean and std. dev of mag. difference (MAG_DELTA) are 0.308 and 1.389 for 820513_g894
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 820513_g894.
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=196.8200 (13:07:16.80) DEC=61.7250 (+61:43:30.0)
XRT distances are from RA=196.7834 (13:07:08.01) DEC=61.7263 (+61:43:34.5)
Found 2 entries in star catalog(s) within 10" of the XRT position.
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
196.7790 61.7281 9.9 -1 USNO-B1 21.61 19.97 20.70
196.7791 61.7281 9.9 -1 GSC2.3 20.06 21.93 99.99
The closest star is 9.93" away.
List UVOT sources within 10" of the XRT position:
There are 34811.496 counts in the bkg source region of 6136.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 5.673 counts/pixel (5-sig UL in 4" is 20.41 mag) for 820513_g894
There are 1127.2751 counts in the xrt source region of 197.00000 pixels.
Rate in xrt region with 8 arcsec radius is 5.722 counts/pixel for 820513_g894
XRT source is too far (60.0638359134634") from center -- do not compute local background.
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 20.96, XRT distances < 5",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 820513_544204414_180331d19h17m02s288548usUT_bkg.region
# Region file format: DS9 version 3.0
global color=red font="helvetica 10 normal" select=1 edit=1 move=1 delete=1 include=1 fixed=0 source
fk5;circle(196.8178,61.7298,45")
fk5;-circle(196.811878771981,61.725415207885,6")
fk5;-circle(196.80657231099,61.7411551335902,6")
Region file: 820513_544204414_180331d19h17m02s288548usUT_xrt.region
# Region file format: DS9 version 3.0
global color=red font="helvetica 10 normal" select=1 edit=1 move=1 delete=1 include=1 fixed=0 source
fk5;circle(196.78338,61.72625,8")
image paragraph message for exposure 2 of trigger 820513
------ Start for Possible Stand-alone Circular ----
In response to GRB180331 (Swift/BAT trigger 820513) at 15:38:39 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 874 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
0.01.
------- notes for trigger 820513 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 180331d19h17m05s420568usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=820513
-expid=544204414 -meonly -msg_image
Results from standard processing of UVOT TDRSS data for this trigger should be
available at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/820513/
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 544204414.95702 or about 2018:090:15:53:29 UT
Found 480 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 5% of the srclist region. Found 41 sources in
srclist catalog. Found 8 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 6 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 20.96 mag. Found 46 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 5% of the
Genie image region.
Genie image analysis:
Found 34811.5 counts in the large background region of 6136.0 pixels or a rate
of 5.673 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 20.41 mag. for a
4-arcsec aperture.
Found 1127.3 counts in the XRT position region of 197.0 pixels or a rate of
5.722 counts/pixel in a radius of 8.0 arcsec. The net count rate (using large
background region) at the XRT position is 0.064 +/- 0.227 (1-sigma) cps or
22.76 mag and a range from 21.12 to 99.99 mag. The 3-sigma UL at the XRT
position is 0.746 cps or 20.10 mag. The closest srclist source has ra= 196.7642
dec= 61.7324 mag=18.22 sep=39.54". The closest Genie source has ra= 196.7883
dec= 61.7223 mag=21.31 sep=16.67".
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?
544204414 873 WHITE srclist found no candidates.
544204414 873 WHITE image found no candidates.
List afterglow candidates for other finding charts.
544204207 666 WHITE srclist found no candidates.
544204207 666 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: 61.72625
GRB_ERROR: 5
GRB_RA: 196.78338
IMAGE_START_TIME: 15:53:29
MAGNITUDE: 20.1
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT