image overlap message for exposure 1 of trigger 878504
uvot_overlap.pl vrs. 2010-12-20b fem started at 181222d21h50m42s251651usUT
The observation of trigger 878504 started 2018-12-22T21:44:59.3
Examining file 878504_g169_uvot_sky_image.fits
The exposure ID is 567207899
The exposure time is 149.857 (seconds)
The filter is WHITE.
The uvot region is centered at (131.3833,-5.4910) 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 0.528 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 1 of trigger 878504
find_uvot_ag.pl vrs. 2017-02-17 fem started at 181222d21h50m43s398311usUT
Observation start time is 2018-12-22T21:44:59.3
Examining file 878504_g169_uvot_catalog_image.fits
The exposure ID is 567207899
The exposure is 149.857 sec.
The bin size is 2 pixels
The filter is WHITE
There are 8 detected source(s) for 878504_g169
Aspect correction adds 0.00121 degrees (0.290 sec of time = 4.33 arc sec) to RA
Aspect correction adds -0.00124 degrees (-4.46 arcsec) to Dec
Total aspect correction is 6.22 arcsec
Star catalogs centered at 131.3780 , -5.4891 with radius 2.62 arc min.
n_usno: 57 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 0.415" for 878504_g169
Mean and std. dev of mag. difference (MAG_DELTA) are 0.811 and 0.241 for 878504_g169
Found 3 entries without IDs and 3 entries that are acceptable afterglow candidates for 878504_g169.
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.
*** WARNING 37 per cent of entries have no IDs.
-----------------
Entry 0 in the list of sources is a candidate afterglow for 878504_g169 with genie
ra=131.38654 (08:45:32.77) dec=-5.48564 (-05:29:08.3) +/- 1.0" mag=21.11+/-0.30
dist=42.2 REFID=6 major=0.8 minor=0.5 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
131.3897 -5.4821 17.3 -1 USNO-B1 20.83 19.25 19.95
uvot_check_outside found 12 of 12 good pixels
##### This source remains a candidate #####
It has no entries within 3.5" or brighter than 12 mag
-----------------
Entry 6 in the list of sources is a candidate afterglow for 878504_g169 with genie
ra=131.39962 (08:45:35.91) dec=-5.47410 (-05:28:26.8) +/- 1.2" mag=21.40+/-0.37
dist=101.4 REFID=3 major=1.2 minor=1.0 flag=0
This source is near the edge of image (0.931)
Found 2 entries in star catalog(s) within 20.0" of the candidate.
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
131.3998 -5.4698 15.4 -1 USNO-B1 20.72 18.58 19.53
131.4039 -5.4750 15.6 -1 USNO-B1 14.18 12.99 13.52
uvot_check_outside found 13 of 13 good pixels
##### This source remains a candidate #####
It has no entries within 5.25" or brighter than 12 mag
-----------------
Entry 7 in the list of sources is a candidate afterglow for 878504_g169 with genie
ra=131.39676 (08:45:35.22) dec=-5.50859 (-05:30:30.9) +/- 0.7" mag=19.80+/-0.17
dist=107.6 REFID=1 major=0.7 minor=0.3 flag=0
This source is near the edge of image (0.973)
Found 2 entries in star catalog(s) within 20.0" of the candidate.
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
131.3974 -5.5095 4.0 -1 USNO-B1 15.33 13.65 14.40 *
131.3957 -5.5123 13.9 -1 USNO-B1 19.54 18.29 18.84
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 5.25" or brighter than 12 mag
separation of 0 and 6 is 62.7 arc sec
There are 48762.211 counts in the bkg source region of 5966.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 8.173 counts/pixel (5-sig UL in 4" is 20.21 mag) for 878504_g169
Good candidates have no ID, acceptable profiles,
mag between 9.01 and 20.20, 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_567207899_181222d21h50m43s398311usUT_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(131.3833,-5.4910,45")
fk5;-circle(131.386537410886,-5.48564462489389,6")
fk5;-circle(131.389746416477,-5.48218363586744,6")
fk5;-circle(131.393074245612,-5.49333658962127,6")
image paragraph message for exposure 1 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 150 seconds with the White filter
starting 147 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 181222d21h50m59s987919usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=878504
-expid=567207899 -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 567207899.26566 or about 2018:356:21:44:54 UT
Found 401 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 7% of the srclist region. Found 62 sources in
srclist catalog. Found 7 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 8 source(s) in Genie image catalog. Found 3 Genie image source(s) without
IDs. There are 0 good candidate(s) in the Genie image catalog. Good candidates
must be brighter than 20.20 mag. Found 53 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 48762.2 counts in the large background region of 5966.0 pixels or a rate
of 8.173 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 20.21 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?
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
List afterglow candidates for other finding charts.
------- Tokens for Quick GCN -------
CATALOG_TYPE: SRCLIST
FILTER: white
GRB_DEC: -5.48800
GRB_ERROR: 200
GRB_RA: 131.37500
IMAGE_START_TIME: 21:44:54
MAGNITUDE: 18.0
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: BAT