image overlap message for exposure 2 of trigger 811686
uvot_overlap.pl vrs. 2010-12-20b fem started at 180225d20h43m42s876624usUT
The observation of trigger 811686 started 2018-02-25T20:36:48.1
Examining file 811686_g356_uvot_sky_image.fits
The exposure ID is 541283808
The exposure time is 249.946 (seconds)
The filter is U.
The uvot region is centered at (185.6110,29.2972) with a roll angle of 56.1
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 (185.6090,29.2930) with a radius of 3.000 arc min
This is 0.273 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 2 of trigger 811686
find_uvot_ag.pl vrs. 2017-02-17 fem started at 180225d20h43m43s377106usUT
Observation start time is 2018-02-25T20:36:48.1
Examining file 811686_g356_uvot_catalog_image.fits
The exposure ID is 541283808
The exposure is 249.946 sec.
The bin size is 2 pixels
The filter is U
There are 5 detected source(s) for 811686_g356
Aspect correction adds 0.00055 degrees (0.132 sec of time = 1.73 arc sec) to RA
Aspect correction adds 0.00014 degrees ( 0.49 arcsec) to Dec
Total aspect correction is 1.80 arcsec
Star catalogs centered at 185.6084 , 29.2974 with radius 2.57 arc min.
n_usno: 35 n_gsc: 37
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 0.612" for 811686_g356
Mean and std. dev of mag. difference (MAG_DELTA) are 0.677 and 0.850 for 811686_g356
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 811686_g356.
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=185.6090 (12:22:26.16) DEC=29.2930 (+29:17:34.8)
XRT distances are as reported in catalog file.
There are 13397.752 counts in the bkg source region of 6196.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 2.162 counts/pixel (5-sig UL in 4" is 20.05 mag) for 811686_g356
Good candidates have no ID, acceptable profiles,
mag between 9.01 and 20.04, 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: 811686_541283808_180225d20h43m43s377106usUT_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(185.6110,29.2972,45")
fk5;-circle(185.608519997842,29.3024554242575,6")
image paragraph message for exposure 2 of trigger 811686
IMAGE PROBLEM: partial overlap
------ Start for Possible Stand-alone Circular ----
In response to GRB180225 (Swift/BAT trigger 811686) at 20:30:51 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
336 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 19.2 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 18.0 mag. No
correction has been made for the expected extinction corresponding to E(B-V) of
0.02.
------- notes for trigger 811686 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 180225d20h43m44s092621usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=811686
-expid=541283808 -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/811686/
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 541283808.07832 or about 2018:056:20:36:43 UT
Found 325 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 3% of the srclist region. Found 52 sources in
srclist catalog. Found 23 srclist source(s) without IDs. There are 0 good
candidate(s) in the srclist catalog. Good candidates must be brighter than
17.56 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 20.04 mag. Found 37 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 13397.8 counts in the large background region of 6196.0 pixels or a rate
of 2.162 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 20.09 mag. for a
4-arcsec aperture.
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?
541283808 336 U srclist found no candidates.
541283808 336 U image found no candidates.
List afterglow candidates for other finding charts.
541283650 178 WHITE srclist found no candidates.
541283650 178 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: SRCLIST
FILTER: u
GRB_DEC: 29.29300
GRB_ERROR: 200
GRB_RA: 185.60900
IMAGE_START_TIME: 20:36:43
MAGNITUDE: 18.0
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: BAT