image overlap message for exposure 2 of trigger 820347
uvot_overlap.pl vrs. 2010-12-20b fem started at 180331d06h27m10s136397usUT
The observation of trigger 820347 started 2018-03-31T04:19:50.3
Examining file ./820347_g294_uvot_sky_image.fits
The exposure ID is 544162790
The exposure time is 249.946 (seconds)
The filter is U.
The uvot region is centered at (66.0135,13.3953) with a roll angle of 266.0
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 (66.0170,13.3980) with a radius of 3.000 arc min
This is 0.261 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 (66.0247,13.3989) with a radius of 0.030 arc min
This is 0.687 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 820347
find_uvot_ag.pl vrs. 2017-02-17 fem started at 180331d06h27m18s391689usUT
Observation start time is 2018-03-31T04:19:50.3
Examining file ./820347_g294_uvot_catalog_image.fits
The exposure ID is 544162790
The exposure is 249.946 sec.
The bin size is 2 pixels
The filter is U
There are 1 detected source(s) for 820347_g294
Aspect correction adds -0.00028 degrees (-0.067 sec of time = -0.97 arc sec) to RA
Aspect correction adds -0.00040 degrees (-1.42 arcsec) to Dec
Total aspect correction is 1.72 arcsec
Star catalogs centered at 66.0219 , 13.4003 with radius 2.00 arc min.
n_usno: 22 n_gsc: 15
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 1 matched entries is 0.154" for 820347_g294
Mean and std. dev of mag. difference (MAG_DELTA) are 0.932 and 0.000 for 820347_g294
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 820347_g294.
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=66.0170 (04:24:04.08) DEC=13.3980 (+13:23:52.8)
XRT distances are from RA=66.0247 (04:24:05.92) DEC=13.3989 (+13:23:56.1)
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
There are 44407.207 counts in the bkg source region of 6315.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 7.032 counts/pixel (5-sig UL in 4" is 19.41 mag) for 820347_g294
There are 1477.5073 counts in the xrt source region of 208.00000 pixels.
Rate in xrt region with 8 arcsec radius is 7.103 counts/pixel for 820347_g294
There are 8433.5293 counts in the xrt_bkg source region of 1159.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 7.277 counts/pixel (5-sig UL in 4" is 19.39 mag) for 820347_g294
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 19.96, 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: 820347_544162790_180331d06h27m18s391689usUT_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(66.0135,13.3953,45")
fk5;-circle(66.0245130069265,13.404058544988,6")
Region file: 820347_544162790_180331d06h27m18s391689usUT_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(66.02467,13.39892,8")
Region file: 820347_544162790_180331d06h27m18s391689usUT_xrt_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(66.02467,13.39892,25")
fk5;-circle(66.02467,13.39892,15")
fk5;-circle(66.0245130069265,13.404058544988,6")
image paragraph message for exposure 2 of trigger 820347
------ Start for Possible Stand-alone Circular ----
In response to GRB180331 (Swift/BAT trigger 820347) at 04:14:55 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
273 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
0.60.
------- notes for trigger 820347 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 180331d06h27m20s802160usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=820347
-expid=544162790 -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/820347/
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 544162790.28254 or about 2018:090:04:19:45 UT
Found 321 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 3% of the srclist region. Found 13 sources in
srclist catalog. Found 0 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 1 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 19.96 mag. Found 18 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 3% of the
Genie image region.
Genie image analysis:
Found 44407.2 counts in the large background region of 6315.0 pixels or a rate
of 7.032 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 19.45 mag. for a
4-arcsec aperture.
Found 1477.5 counts in the XRT position region of 208.0 pixels or a rate of
7.103 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is -0.144 +/- 0.167 (1-sigma) cps. The
3-sigma UL at the XRT position is 0.502 cps or 19.13 mag. The closest srclist
source has ra= 66.0244 dec= 13.4040 mag=15.79 sep=18.41". The closest Genie
source has ra= 66.0245 dec= 13.4041 mag=15.21 sep=18.51".
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?
544162790 273 U srclist found no candidates.
544162790 273 U image found no candidates.
List afterglow candidates for other finding charts.
544162632 115 WHITE srclist found no candidates.
544162632 115 WHITE image found no candidates.
544163392 875 WHITE srclist found no candidates.
544163392 875 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: 13.39892
GRB_ERROR: 5
GRB_RA: 66.02467
IMAGE_START_TIME: 04:19:45
MAGNITUDE: 19.1
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT