image overlap message for exposure 3 of trigger 878504
uvot_overlap.pl vrs. 2010-12-20b fem started at 181222d22h02m58s979657usUT
The observation of trigger 878504 started 2018-12-22T21:56:51.8
Examining file 878504_g881_uvot_sky_image.fits
The exposure ID is 567208611
The exposure time is 149.868 (seconds)
The filter is WHITE.
The uvot region is centered at (131.3805,-5.4913) with a roll angle of 128.0
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 (131.3750,-5.4880) with a radius of 3.000 arc min
This is 0.384 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
Could not find the location of an XRT error circle
image afterglow message for exposure 3 of trigger 878504
find_uvot_ag.pl vrs. 2017-02-17 fem started at 181222d22h03m00s281548usUT
Observation start time is 2018-12-22T21:56:51.8
Examining file 878504_g881_uvot_catalog_image.fits
The exposure ID is 567208611
The exposure is 149.868 sec.
The bin size is 2 pixels
The filter is WHITE
There are 5 detected source(s) for 878504_g881
Aspect correction adds 0.00104 degrees (0.250 sec of time = 3.74 arc sec) to RA
Aspect correction adds -0.00166 degrees (-5.96 arcsec) to Dec
Total aspect correction is 7.04 arcsec
Star catalogs centered at 131.3756 , -5.4893 with radius 2.51 arc min.
n_usno: 51 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
*** WARNING -- no XRT distances are available.
Mean distance difference (CAT_DELTA) for 5 matched entries is 0.263" for 878504_g881
Mean and std. dev of mag. difference (MAG_DELTA) are 0.691 and 0.175 for 878504_g881
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 878504_g881.
Acceptable entries have no ID, BAT distance < 200" or XRT distance < 10", 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=131.3750 (08:45:30.00) DEC=-5.4880 (-05:29:16.8)
XRT distances are as reported in catalog file.
There are 98659.680 counts in the bkg source region of 6264.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 15.750 counts/pixel (5-sig UL in 4" is 19.85 mag) for 878504_g881
Good candidates have no ID, acceptable profiles,
mag between 9.01 and 19.85, BAT distances < 200",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 878504_567208611_181222d22h03m00s281548usUT_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(131.3805,-5.4913,45")
fk5;-circle(131.393142347802,-5.49334860798022,6")
image paragraph message for exposure 3 of trigger 878504
THIS MESSAGE IS *NOT* READY FOR DISTRIBUTION.
MORE ANALYSIS IS REQUIRED TO DETERMINE WHETHER THERE IS AN AFTERGLOW CANDIDATE.
IMAGE PROBLEM: partial overlap
SRCLIST PROBLEM: srclist filled telemetry buffer
See notes for more details.
------ Start for Possible Stand-alone Circular ----
In response to GRB181222 (Swift/BAT trigger 878504) at 21:42:09 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 859 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 25% of
the BAT 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
BAT 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 878504 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 181222d22h03m03s260736usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=878504
-expid=567208611 -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/878504/
Links to data for all triggers can be found at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/
No XRT position found for srclist. No XRT position found for Genie image. BAT
position found.
UVOT exposure began at MET 567208611.80462 or about 2018:356:21:56:46 UT
Found 797 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 7% of the srclist region. Found 190 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 76 srclist
source(s) without IDs. There are 0 good candidate(s) in the srclist catalog.
Good candidates must be brighter than 18.66 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 19.85 mag. Found 47 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 98659.7 counts in the large background region of 6264.0 pixels or a rate
of 15.750 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 19.85 mag. for a
4-arcsec aperture. The number of srclist sources filled the available
telemetry. The weakest source detected was 19.29 mag.
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?
567208611 859 WHITE srclist found no candidates.
567208611 859 WHITE image found no candidates.
List afterglow candidates for other finding charts.
567207899 147 WHITE srclist found no candidates.
567207899 147 WHITE 131.38654 -5.48564 21.11/20.2 42.2 image Yes
567207899 147 WHITE 131.39962 -5.47410 21.40/20.2 101.4 image Yes
567208058 306 U srclist found no candidates.
567208058 306 U 131.37669 -5.47878 20.92/20.0 33.7 image Yes
------- Tokens for Quick GCN -------