image overlap message for exposure 1 of trigger 844192
uvot_overlap.pl vrs. 2010-12-20b fem started at 180624d21h25m15s076147usUT
The observation of trigger 844192 started 2018-06-24T13:51:59.7
Examining file ./844192_g138_uvot_sky_image.fits
The exposure ID is 551541119
The exposure time is 149.857 (seconds)
The filter is WHITE.
The uvot region is centered at (318.0983,-2.3355) with a roll angle of 60.2
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 (318.0710,-2.3320) with a radius of 3.000 arc min
This is 1.650 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 6.94 sq. arc min or 0.25 of the BAT error circle
The XRT error circle is centered at (318.0975,-2.3382) with a radius of 0.025 arc min
This is 0.174 arc min from the center of the uvot region
The area of the XRT error circle is 0.002 sq. arc min
The UVOT/XRT overlap is 0.002 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 1 of trigger 844192
find_uvot_ag.pl vrs. 2017-02-17 fem started at 180624d21h25m41s784851usUT
Observation start time is 2018-06-24T13:51:59.7
Examining file ./844192_g138_uvot_catalog_image.fits
The exposure ID is 551541119
The exposure is 149.857 sec.
The bin size is 2 pixels
The filter is WHITE
There are 16 detected source(s) for 844192_g138
Aspect correction adds 0.00198 degrees (0.474 sec of time = 7.10 arc sec) to RA
Aspect correction adds 0.00086 degrees ( 3.09 arcsec) to Dec
Total aspect correction is 7.75 arcsec
Star catalogs centered at 318.0974 , -2.3360 with radius 2.63 arc min.
n_usno: 131 n_gsc: 100
*** WARNING -- bright star catalog has 2 entries brighter than 12 mag
The brightest has mag 11.65418
RA DEC Mag Color
bright star 0: 318.08086 (21:12:19.41) -2.30848 (-02:18:30.5) 11.65 USNO-V
bright star 1: 318.11349 (21:12:27.24) -2.34517 (-02:20:42.6) 11.83 GSC-F
Mean distance difference (CAT_DELTA) for 14 matched entries is 0.586" for 844192_g138
Mean and std. dev of mag. difference (MAG_DELTA) are 1.043 and 0.364 for 844192_g138
Found 4 entries without IDs and 1 entries that are acceptable afterglow candidates for 844192_g138.
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.
3 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=318.0710 (21:12:17.04) DEC=-2.3320 (-02:19:55.2)
XRT distances are from RA=318.0975 (21:12:23.40) DEC=-2.3382 (-02:20:17.7)
-----------------
Entry 17 in the list of sources is a candidate afterglow for 844192_g138 with genie
ra=318.08102 (21:12:19.44) dec=-2.31436 (-02:18:51.7) +/- 0.6" mag=18.51+/-0.15
dist=104.5 REFID=10 major=0.5 minor=0.5 flag=16 (aperture_incomplete)
*** The position of this source is inconsistent with the XRT position.
The position is 73.0 arc sec from the BAT position.
This source is near the edge of image (0.996)
Found 5 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
318.0845 -2.3149 12.5 -1 USNO-B1 20.72 18.73 19.61
318.0803 -2.3119 9.3 -1 USNO-B1 19.96 18.90 19.37
318.0844 -2.3150 12.2 -1 GSC2.3 18.67 20.28 99.99
318.0836 -2.3127 11.1 -1 GSC2.3 99.99 21.92 99.99
318.0844 -2.3108 17.9 -1 GSC2.3 99.99 21.96 99.99
*** If XRT position is correct, then this is NOT the afterglow
*** unacceptable flag of 16
Found 1 entries in star catalog(s) within 10" of the XRT position.
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
318.0970 -2.3379 2.1 -1 GSC2.3 20.85 99.99 99.99
The closest star is 2.09" away.
List UVOT sources within 10" of the XRT position:
There are 62377.484 counts in the bkg source region of 5964.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 10.459 counts/pixel (5-sig UL in 4" is 20.08 mag) for 844192_g138
There are 2081.0867 counts in the xrt source region of 198.00000 pixels.
Rate in xrt region with 8 arcsec radius is 10.511 counts/pixel for 844192_g138
There are 12361.950 counts in the xrt_bkg source region of 1218.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 10.149 counts/pixel (5-sig UL in 4" is 20.09 mag) for 844192_g138
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 20.63, 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: 844192_551541119_180624d21h25m41s784851usUT_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(318.0983,-2.3355,45")
fk5;-circle(318.090896286426,-2.34225994424018,6")
fk5;-circle(318.098996845431,-2.32563411465263,6")
fk5;-circle(318.107664014021,-2.33105753672825,6")
Region file: 844192_551541119_180624d21h25m41s784851usUT_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(318.09750,-2.33825,8")
Region file: 844192_551541119_180624d21h25m41s784851usUT_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(318.09750,-2.33825,25")
fk5;-circle(318.09750,-2.33825,15")
fk5;-circle(318.090896286426,-2.34225994424018,6")
image paragraph message for exposure 1 of trigger 844192
------ Start for Possible Stand-alone Circular ----
In response to GRB180624 (Swift/BAT trigger 844192) at 13:49:40 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 118 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
0.05.
------- notes for trigger 844192 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 180624d21h25m48s724130usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=844192
-expid=551541119 -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/844192/
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 551541119.6547 or about 2018:175:13:51:54 UT
Found 658 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 11% of the srclist region. Found 75 sources in
srclist catalog. Found 20 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 16 source(s) in Genie image catalog. Found 4 Genie image source(s)
without IDs. There are 0 good candidate(s) in the Genie image catalog. Good
candidates must be brighter than 20.63 mag. Found 127 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
12% of the Genie image region.
Genie image analysis:
Found 62377.5 counts in the large background region of 5964.0 pixels or a rate
of 10.459 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 20.08 mag. for a
4-arcsec aperture.
Found 2081.1 counts in the XRT position region of 198.0 pixels or a rate of
10.511 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 0.477 +/- 0.327 (1-sigma) cps or
20.58 mag and a range from 20.02 to 21.84 mag. The 3-sigma UL at the XRT
position is 1.458 cps or 19.37 mag. The closest srclist source has ra= 318.0911
dec= -2.3420 mag=19.67 sep=26.66". The closest Genie source has ra= 318.0909
dec= -2.3423 mag=19.06 sep=27.80".
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?
551541119 117 WHITE srclist found no candidates.
551541119 117 WHITE image found no candidates.
List afterglow candidates for other finding charts.
551541277 275 U srclist found no candidates.
551541277 275 U image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: -2.33825
GRB_ERROR: 5
GRB_RA: 318.09750
IMAGE_START_TIME: 13:51:54
MAGNITUDE: 19.4
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT