image overlap message for exposure 1 of trigger 844015
uvot_overlap.pl vrs. 2010-12-20b fem started at 180623d21h26m51s774300usUT
The observation of trigger 844015 started 2018-06-23T16:43:43.2
Examining file ./844015_g106_uvot_sky_image.fits
The exposure ID is 551465023
The exposure time is 149.868 (seconds)
The filter is WHITE.
The uvot region is centered at (214.5212,-60.2556) with a roll angle of 253.6
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 (214.5110,-60.2940) with a radius of 3.000 arc min
This is 2.323 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 5.13 sq. arc min or 0.18 of the BAT error circle
The XRT error circle is centered at (214.5288,-60.2535) with a radius of 0.025 arc min
This is 0.258 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 844015
find_uvot_ag.pl vrs. 2017-02-17 fem started at 180623d21h27m02s542798usUT
Observation start time is 2018-06-23T16:43:43.2
Examining file ./844015_g106_uvot_catalog_image.fits
The exposure ID is 551465023
The exposure is 149.868 sec.
The bin size is 2 pixels
The filter is WHITE
There are 21 detected source(s) for 844015_g106
Aspect correction adds -0.00058 degrees (-0.139 sec of time = -1.04 arc sec) to RA
Aspect correction adds -0.00023 degrees (-0.83 arcsec) to Dec
Total aspect correction is 1.33 arcsec
Star catalogs centered at 214.5215 , -60.2524 with radius 2.90 arc min.
n_usno: 327 n_gsc: 691
*** WARNING -- bright star catalog has 3 entries brighter than 12 mag
The brightest has mag 10.93
RA DEC Mag Color
bright star 0: 214.56951 (14:18:16.68) -60.23391 (-60:14:02.1) 10.97 USNO-V
bright star 1: 214.47406 (14:17:53.77) -60.27144 (-60:16:17.2) 10.93 USNO-R
bright star 2: 214.47120 (14:17:53.09) -60.27201 (-60:16:19.2) 11.51 USNO-V
Mean distance difference (CAT_DELTA) for 20 matched entries is 0.436" for 844015_g106
Mean and std. dev of mag. difference (MAG_DELTA) are 1.127 and 0.840 for 844015_g106
Found 2 entries without IDs and 1 entries that are acceptable afterglow candidates for 844015_g106.
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.
1 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=214.5110 (14:18:02.64) DEC=-60.2940 (-60:17:38.4)
XRT distances are from RA=214.5288 (14:18:06.91) DEC=-60.2535 (-60:15:12.7)
-----------------
Entry 3 in the list of sources is a candidate afterglow for 844015_g106 with genie
ra=214.52566 (14:18:06.16) dec=-60.24736 (-60:14:50.5) +/- 0.6" mag=19.19+/-0.16
dist=22.9 REFID=7 major=0.9 minor=0.8 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 169.9 arc sec from the BAT position.
Found 8 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
214.5252 -60.2492 6.8 -1 USNO-B1 17.47 15.45 16.35
214.5239 -60.2477 3.5 -1 USNO-B1 99.99 16.86 99.99
214.5235 -60.2477 4.1 -1 USNO-B1 19.93 17.95 18.83
214.5251 -60.2478 1.8 -1 USNO-B1 17.75 15.50 16.50 *
214.5349 -60.2475 16.6 -1 USNO-B1 20.32 18.41 19.26
214.5253 -60.2494 7.5 -1 GSC2.3 15.82 17.57 99.99
214.5254 -60.2474 0.5 -1 GSC2.3 15.68 17.72 99.99 *
214.5348 -60.2474 16.3 -1 GSC2.3 19.39 21.61 99.99
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 3.5" or brighter than 12 mag
Found 2 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
214.5287 -60.2539 1.4 -1 USNO-B1 20.55 17.85 19.05
214.5285 -60.2539 1.6 -1 GSC2.3 17.61 20.75 99.99
The closest star is 1.37" away.
List UVOT sources within 10" of the XRT position:
There are 57192.750 counts in the bkg source region of 5598.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 10.217 counts/pixel (5-sig UL in 4" is 20.09 mag) for 844015_g106
There are 1354.9529 counts in the xrt source region of 194.00000 pixels.
Rate in xrt region with 8 arcsec radius is 6.984 counts/pixel for 844015_g106
There are 8941.5625 counts in the xrt_bkg source region of 991.00000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 9.023 counts/pixel (5-sig UL in 4" is 20.16 mag) for 844015_g106
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 20.64, 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: 844015_551465023_180623d21h27m02s542798usUT_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(214.5212,-60.2556,45")
fk5;-circle(214.525346248545,-60.2494240111971,6")
fk5;-circle(214.52495592699,-60.257875010798,6")
fk5;-circle(214.537865306932,-60.25904276713,6")
fk5;-circle(214.525659274573,-60.2473550805495,6")
fk5;-circle(214.53893625471,-60.2626068108626,6")
fk5;-circle(214.529503127637,-60.2676176246224,6")
fk5;-circle(214.502186702739,-60.2591974907905,6")
fk5;-circle(214.501141363771,-60.2637138627455,6")
Region file: 844015_551465023_180623d21h27m02s542798usUT_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(214.52879,-60.25353,8")
Region file: 844015_551465023_180623d21h27m02s542798usUT_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(214.52879,-60.25353,25")
fk5;-circle(214.52879,-60.25353,15")
fk5;-circle(214.525346248545,-60.2494240111971,6")
fk5;-circle(214.52495592699,-60.257875010798,6")
fk5;-circle(214.537865306932,-60.25904276713,6")
fk5;-circle(214.525659274573,-60.2473550805495,6")
image paragraph message for exposure 1 of trigger 844015
THIS MESSAGE IS *NOT* READY FOR DISTRIBUTION.
MORE ANALYSIS IS REQUIRED TO DETERMINE WHETHER THERE IS AN AFTERGLOW CANDIDATE.
IMAGE PROBLEM: damaged image (negative pixel value)
SRCLIST PROBLEM: srclist filled telemetry buffer
See notes for more details.
WARNING -- because of the LARGE EXTINCTION, results should be used cautiously.
------ Start for Possible Stand-alone Circular ----
In response to GRB180623 (Swift/BAT trigger 844015) at 16:41:56 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 85 seconds after the BAT trigger. No credible afterglow candidate has
been found in the initial data products. The 2.7'x2.7' sub-image processing
FAILED because of damaged image (negative pixel value). 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 large, but uncertain, extinction expected.
------- notes for trigger 844015 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 180623d21h27m09s253043usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=844015
-expid=551465023 -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/844015/
Links to data for all triggers can be found at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/
Large extinction of 24.59 found for bat position. Unreliable extinction found
for xrt position. The Genie image appears to be DAMAGED with a min. value of
-3.912784.
XRT position found for srclist. XRT position found for Genie image. BAT
position found.
UVOT exposure began at MET 551465023.22192 or about 2018:174:16:43:38 UT
Found 1885 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 28% of the srclist region. Found 190 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 21 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 21 source(s) in Genie image catalog. Found 2 Genie image source(s)
without IDs. There are 0 good candidate(s) in the Genie image catalog. Good
candidates must be brighter than 20.64 mag. Found 323 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
26% of the Genie image region. The number of srclist sources filled the
available telemetry. The weakest source detected was 19.21 mag. The closest
srclist source has ra= 214.5253 dec= -60.2492 mag=18.55 sep=16.75". The closest
Genie source has ra= 214.5254 dec= -60.2494 mag=18.02 sep=16.01".
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?
551465023 85 WHITE srclist found no candidates.
551465023 85 WHITE image found no candidates.
List afterglow candidates for other finding charts.
551465236 298 U srclist found no candidates.
551465236 298 U image found no candidates.
551465815 877 WHITE srclist found no candidates.
551465815 877 WHITE image found no candidates.
------- Tokens for Quick GCN -------