image overlap message for exposure 2 of trigger 852553
uvot_overlap.pl vrs. 2010-12-20b fem started at 180810d20h41m10s868362usUT
The observation of trigger 852553 started 2018-08-09T20:34:03.2
Examining file ./852553_g314_uvot_sky_image.fits
The exposure ID is 555539643
The exposure time is 249.946 (seconds)
The filter is U.
The uvot region is centered at (299.6951,-15.2999) 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 (299.7117,-15.2928) with a radius of 1.000 arc min
This is 1.051 arc min from the center of the uvot region
The area of the BAT error circle is 3.14 sq. arc min
The UVOT/BAT overlap is 2.26 sq. arc min or 0.72 of the BAT error circle
The XRT error circle is centered at (299.7000,-15.2989) with a radius of 0.023 arc min
This is 0.289 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 852553
find_uvot_ag.pl vrs. 2017-02-17 fem started at 180810d20h41m19s125507usUT
Observation start time is 2018-08-09T20:34:03.2
Examining file ./852553_g314_uvot_catalog_image.fits
The exposure ID is 555539643
The exposure is 249.946 sec.
The bin size is 2 pixels
The filter is U
There are 16 detected source(s) for 852553_g314
Aspect correction adds -0.00111 degrees (-0.267 sec of time = -3.87 arc sec) to RA
Aspect correction adds 0.00028 degrees ( 1.02 arcsec) to Dec
Total aspect correction is 4.00 arcsec
Star catalogs centered at 299.6961 , -15.3008 with radius 2.40 arc min.
n_usno: 144 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 16 matched entries is 0.663" for 852553_g314
Mean and std. dev of mag. difference (MAG_DELTA) are 0.934 and 0.417 for 852553_g314
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 852553_g314.
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=299.7117 (19:58:50.80) DEC=-15.2928 (-15:17:34.0)
XRT distances are from RA=299.7000 (19:58:47.99) DEC=-15.2989 (-15:17:56.1)
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
There are 20388.938 counts in the bkg source region of 6195.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 3.291 counts/pixel (5-sig UL in 4" is 19.82 mag) for 852553_g314
There are 589.01434 counts in the xrt source region of 199.00000 pixels.
Rate in xrt region with 8 arcsec radius is 2.960 counts/pixel for 852553_g314
There are 3973.3052 counts in the xrt_bkg source region of 1247.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 3.186 counts/pixel (5-sig UL in 4" is 19.84 mag) for 852553_g314
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 20.37, 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: 852553_555539643_180810d20h41m19s125507usUT_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(299.6951,-15.2999,45")
fk5;-circle(299.690715325892,-15.2909602913241,6")
Region file: 852553_555539643_180810d20h41m19s125507usUT_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(299.69996,-15.29892,8")
Region file: 852553_555539643_180810d20h41m19s125507usUT_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(299.69996,-15.29892,25")
fk5;-circle(299.69996,-15.29892,15")
image paragraph message for exposure 2 of trigger 852553
------ Start for Possible Stand-alone Circular ----
In response to GRB180809 (Swift/BAT trigger 852553) at 20:28:48 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
293 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
0.16.
------- notes for trigger 852553 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 180810d20h41m21s867694usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=852553
-expid=555539643 -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/852553/
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 555539643.20584 or about 2018:221:20:33:58 UT
Found 911 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 15% of the srclist region. Found 78 sources in
srclist catalog. Found 12 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 16 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 20.37 mag. Found 140 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
16% of the Genie image region.
Genie image analysis:
Found 20388.9 counts in the large background region of 6195.0 pixels or a rate
of 3.291 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 19.86 mag. for a
4-arcsec aperture.
Found 589.0 counts in the XRT position region of 199.0 pixels or a rate of
2.960 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is -0.180 +/- 0.105 (1-sigma) cps. The
3-sigma UL at the XRT position is 0.315 cps or 19.63 mag. The closest srclist
source has ra= 299.6905 dec= -15.2910 mag=15.47 sep=43.32". The closest Genie
source has ra= 299.6907 dec= -15.2910 mag=14.80 sep=43.03".
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?
555539643 293 U srclist found no candidates.
555539643 293 U image found no candidates.
List afterglow candidates for other finding charts.
555539431 81 WHITE 299.69979 -15.29926 19.27/19.2 1.4 srclist Yes
555539431 81 WHITE 299.69983 -15.29915 18.91/20.6 0.9 image Yes
555540220 870 WHITE srclist found no candidates.
555540220 870 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: -15.29892
GRB_ERROR: 5
GRB_RA: 299.69996
IMAGE_START_TIME: 20:33:58
MAGNITUDE: 19.6
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT