image overlap message for exposure 2 of trigger 855434
uvot_overlap.pl vrs. 2010-12-20b fem started at 180824d00h44m51s528265usUT
The observation of trigger 855434 started 2018-08-23T20:06:40.9
Examining file ./855434_g3727_uvot_sky_image.fits
The exposure ID is 556747600
The exposure time is 149.857 (seconds)
The filter is WHITE.
The uvot region is centered at (210.3430,14.8816) with a roll angle of 273.8
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 (210.3490,14.8840) with a radius of 3.000 arc min
This is 0.376 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 (210.3558,14.8924) with a radius of 0.027 arc min
This is 0.988 arc min from the center of the uvot region
The area of the XRT error circle is 0.002 sq. arc min
The UVOT/XRT overlap is 0.002 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 2 of trigger 855434
find_uvot_ag.pl vrs. 2017-02-17 fem started at 180824d00h44m56s756788usUT
Observation start time is 2018-08-23T20:06:40.9
Examining file ./855434_g3727_uvot_catalog_image.fits
The exposure ID is 556747600
The exposure is 149.857 sec.
The bin size is 2 pixels
The filter is WHITE
There are 2 detected source(s) for 855434_g3727
Aspect correction adds -0.00001 degrees (-0.003 sec of time = -0.04 arc sec) to RA
Aspect correction adds 0.00021 degrees ( 0.75 arcsec) to Dec
Total aspect correction is 0.75 arcsec
Star catalogs centered at 210.3502 , 14.8875 with radius 2.46 arc min.
n_usno: 41 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 2 matched entries is 0.178" for 855434_g3727
Mean and std. dev of mag. difference (MAG_DELTA) are 0.884 and 0.549 for 855434_g3727
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 855434_g3727.
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=210.3490 (14:01:23.76) DEC=14.8840 (+14:53:02.4)
XRT distances are from RA=210.3558 (14:01:25.40) DEC=14.8924 (+14:53:32.8)
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
There are 1.9136997E+05 counts in the bkg source region of 6319.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 30.285 counts/pixel (5-sig UL in 4" is 19.50 mag) for 855434_g3727
There are 5996.2896 counts in the xrt source region of 197.00000 pixels.
Rate in xrt region with 8 arcsec radius is 30.438 counts/pixel for 855434_g3727
XRT source is too far (59.2916027273467") 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 20.05, 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: 855434_556747600_180824d00h44m56s756788usUT_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(210.3430,14.8816,45")
Region file: 855434_556747600_180824d00h44m56s756788usUT_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(210.35583,14.89244,8")
image paragraph message for exposure 2 of trigger 855434
------ Start for Possible Stand-alone Circular ----
In response to GRB180823 (Swift/BAT trigger 855434) at 19:04:32 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 3706 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 0.02.
------- notes for trigger 855434 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 180824d00h45m00s316391usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=855434
-expid=556747600 -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/855434/
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 556747600.89866 or about 2018:235:20:06:35 UT
Found 189 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 3% of the srclist region. Found 12 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
19.22 mag.
Found 2 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 20.05 mag. Found 37 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 4% of the
Genie image region.
Genie image analysis:
Found 191370.0 counts in the large background region of 6319.0 pixels or a rate
of 30.285 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 19.50 mag. for a
4-arcsec aperture.
Found 5996.3 counts in the XRT position region of 197.0 pixels or a rate of
30.438 counts/pixel in a radius of 8.0 arcsec. The net count rate (using large
background region) at the XRT position is 0.201 +/- 0.524 (1-sigma) cps or
21.52 mag and a range from 20.13 to 99.99 mag. The 3-sigma UL at the XRT
position is 1.774 cps or 19.16 mag. The closest srclist source has ra= 210.3385
dec= 14.9055 mag=17.37 sep=76.49". The closest Genie source has ra= 210.3385
dec= 14.9054 mag=16.97 sep=76.28".
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?
556747600 3705 WHITE srclist found no candidates.
556747600 3705 WHITE image found no candidates.
List afterglow candidates for other finding charts.
556744274 379 ? srclist data are not available.
556744274 379 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: 14.89244
GRB_ERROR: 5
GRB_RA: 210.35583
IMAGE_START_TIME: 20:06:35
MAGNITUDE: 19.2
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT