image overlap message for exposure 2 of trigger 878504
uvot_overlap.pl vrs. 2010-12-20b fem started at 181222d21h56m48s987495usUT
The observation of trigger 878504 started 2018-12-22T21:47:38.2
Examining file 878504_g328_uvot_sky_image.fits
The exposure ID is 567208058
The exposure time is 249.935 (seconds)
The filter is U.
The uvot region is centered at (131.3803,-5.4902) with a roll angle of 127.9
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 0.343 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 878504
find_uvot_ag.pl vrs. 2017-02-17 fem started at 181222d21h56m50s803604usUT
Observation start time is 2018-12-22T21:47:38.2
Examining file 878504_g328_uvot_catalog_image.fits
The exposure ID is 567208058
The exposure is 249.935 sec.
The bin size is 2 pixels
The filter is U
There are 5 detected source(s) for 878504_g328
Aspect correction adds 0.00117 degrees (0.282 sec of time = 4.21 arc sec) to RA
Aspect correction adds -0.00161 degrees (-5.79 arcsec) to Dec
Total aspect correction is 7.16 arcsec
Star catalogs centered at 131.3757 , -5.4892 with radius 2.50 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 4 matched entries is 0.393" for 878504_g328
Mean and std. dev of mag. difference (MAG_DELTA) are 1.739 and 0.647 for 878504_g328
Found 1 entries without IDs and 1 entries that are acceptable afterglow candidates for 878504_g328.
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.
-----------------
Entry 0 in the list of sources is a candidate afterglow for 878504_g328 with genie
ra=131.37669 (08:45:30.41) dec=-5.47878 (-05:28:43.6) +/- 1.4" mag=20.92+/-0.43
dist=33.7 REFID=3 major=1.1 minor=0.9 flag=0
Found 1 entries in star catalog(s) within 20.0" of the candidate.
printing all entries
(Entries within 2 arc sec of a source list entry are considered a match)
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
131.3755 -5.4789 4.4 -1 USNO-B1 99.99 19.29 99.99
uvot_check_outside found 13 of 13 good pixels
##### This source remains a candidate #####
It has no entries within 3.5" or brighter than 12 mag
There are 14011.297 counts in the bkg source region of 6201.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 2.260 counts/pixel (5-sig UL in 4" is 20.02 mag) for 878504_g328
Good candidates have no ID, acceptable profiles,
mag between 9.01 and 20.02, 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_567208058_181222d21h56m50s803604usUT_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(131.3803,-5.4902,45")
fk5;-circle(131.376694483346,-5.47878441896261,6")
fk5;-circle(131.393041615304,-5.49334675495699,6")
image paragraph message for exposure 2 of trigger 878504
IMAGE PROBLEM: partial overlap
------ 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 250 seconds with the U filter starting
306 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 878504 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 181222d21h56m53s049000usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=878504
-expid=567208058 -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 567208058.21692 or about 2018:356:21:47:33 UT
Found 727 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 7% of the srclist region. Found 176 sources in
srclist catalog. Found 79 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 1 Genie image source(s) without
IDs. There are 0 good candidate(s) in the Genie image catalog. Good candidates
must be brighter than 20.02 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 14011.3 counts in the large background region of 6201.0 pixels or a rate
of 2.260 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 20.06 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?
567208058 306 U srclist found no candidates.
567208058 306 U 131.37669 -5.47878 20.92/20.0 33.7 image Yes
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
------- Tokens for Quick GCN -------
CATALOG_TYPE: SRCLIST
FILTER: u
GRB_DEC: -5.48800
GRB_ERROR: 200
GRB_RA: 131.37500
IMAGE_START_TIME: 21:47:33
MAGNITUDE: 18.0
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: BAT