image overlap message for exposure 3 of trigger 879909
uvot_overlap.pl vrs. 2010-12-20b fem started at 181228d06h36m11s719591usUT
The observation of trigger 879909 started 2018-12-28T03:07:58.7
Examining file ./879909_g880_uvot_sky_image.fits
The exposure ID is 567659278
The exposure time is 149.868 (seconds)
The filter is WHITE.
The uvot region is centered at (49.8109,13.2008) with a roll angle of 250.2
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 (49.8310,13.1950) with a radius of 3.000 arc min
This is 1.226 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 (49.8121,13.2021) with a radius of 0.030 arc min
This is 0.108 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 3 of trigger 879909
find_uvot_ag.pl vrs. 2017-02-17 fem started at 181228d06h36m28s296496usUT
Observation start time is 2018-12-28T03:07:58.7
Examining file ./879909_g880_uvot_catalog_image.fits
The exposure ID is 567659278
The exposure is 149.868 sec.
The bin size is 2 pixels
The filter is WHITE
There are 5 detected source(s) for 879909_g880
Aspect correction adds -0.00023 degrees (-0.055 sec of time = -0.81 arc sec) to RA
Aspect correction adds 0.00001 degrees ( 0.02 arcsec) to Dec
Total aspect correction is 0.81 arcsec
Star catalogs centered at 49.8127 , 13.2007 with radius 2.35 arc min.
n_usno: 48 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 5 matched entries is 0.314" for 879909_g880
Mean and std. dev of mag. difference (MAG_DELTA) are 1.021 and 0.135 for 879909_g880
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 879909_g880.
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=49.8310 (03:19:19.44) DEC=13.1950 (+13:11:42.0)
XRT distances are from RA=49.8121 (03:19:14.91) DEC=13.2021 (+13:12:07.5)
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
There are 72485.461 counts in the bkg source region of 6080.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 11.922 counts/pixel (5-sig UL in 4" is 20.00 mag) for 879909_g880
There are 2363.6233 counts in the xrt source region of 201.00000 pixels.
Rate in xrt region with 8 arcsec radius is 11.759 counts/pixel for 879909_g880
There are 13982.331 counts in the xrt_bkg source region of 1168.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 11.971 counts/pixel (5-sig UL in 4" is 20.00 mag) for 879909_g880
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 20.56, 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: 879909_567659278_181228d06h36m28s296496usUT_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(49.8109,13.2008,45")
fk5;-circle(49.8076379380818,13.2036770572415,6")
fk5;-circle(49.8124484410143,13.210742980432,6")
Region file: 879909_567659278_181228d06h36m28s296496usUT_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(49.81212,13.20208,8")
Region file: 879909_567659278_181228d06h36m28s296496usUT_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(49.81212,13.20208,25")
fk5;-circle(49.81212,13.20208,15")
fk5;-circle(49.8076379380818,13.2036770572415,6")
image paragraph message for exposure 3 of trigger 879909
------ Start for Possible Stand-alone Circular ----
In response to GRB181228 (Swift/BAT trigger 879909) at 02:53:17 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 858 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
0.51.
------- notes for trigger 879909 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 181228d06h36m31s911522usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=879909
-expid=567659278 -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/879909/
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 567659278.66478 or about 2018:362:03:07:53 UT
Found 394 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 3% of the srclist region. Found 59 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
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 20.56 mag. Found 44 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 72485.5 counts in the large background region of 6080.0 pixels or a rate
of 11.922 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 20.00 mag. for a
4-arcsec aperture.
Found 2363.6 counts in the XRT position region of 201.0 pixels or a rate of
11.759 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is -0.284 +/- 0.351 (1-sigma) cps. The
3-sigma UL at the XRT position is 1.054 cps or 19.72 mag. The closest srclist
source has ra= 49.8075 dec= 13.2037 mag=19.25 sep=17.15". The closest Genie
source has ra= 49.8076 dec= 13.2037 mag=18.75 sep=16.73".
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?
567659278 858 WHITE srclist found no candidates.
567659278 858 WHITE image found no candidates.
List afterglow candidates for other finding charts.
567658513 93 WHITE srclist found no candidates.
567658513 93 WHITE image found no candidates.
567658725 305 U srclist found no candidates.
567658725 305 U image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: 13.20208
GRB_ERROR: 5
GRB_RA: 49.81212
IMAGE_START_TIME: 03:07:53
MAGNITUDE: 19.7
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT