image overlap message for exposure 2 of trigger 844015
uvot_overlap.pl vrs. 2010-12-20b fem started at 180623d21h26m52s777378usUT
The observation of trigger 844015 started 2018-06-23T16:47:16.6
Examining file ./844015_g319_uvot_sky_image.fits
The exposure ID is 551465236
The exposure time is 249.946 (seconds)
The filter is U.
The uvot region is centered at (214.5274,-60.2554) 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 2.365 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 5.02 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 0.121 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 2 of trigger 844015
find_uvot_ag.pl vrs. 2017-02-17 fem started at 180623d21h27m16s606851usUT
Observation start time is 2018-06-23T16:47:16.6
Examining file ./844015_g319_uvot_catalog_image.fits
The exposure ID is 551465236
The exposure is 249.946 sec.
The bin size is 2 pixels
The filter is U
There are 18 detected source(s) for 844015_g319
Aspect correction adds -0.00118 degrees (-0.283 sec of time = -2.11 arc sec) to RA
Aspect correction adds -0.00077 degrees (-2.77 arcsec) to Dec
Total aspect correction is 3.48 arcsec
Star catalogs centered at 214.5244 , -60.2521 with radius 2.75 arc min.
n_usno: 303 n_gsc: 619
*** 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 17 matched entries is 0.368" for 844015_g319
Mean and std. dev of mag. difference (MAG_DELTA) are 1.573 and 0.659 for 844015_g319
Found 2 entries without IDs and 0 entries that are acceptable afterglow candidates for 844015_g319.
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.
2 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)
Found NO acceptable entries.
Unidentified entry closest to XRT position is no. 14:
ra=214.56495 dec=-60.23691 +/- 0.6" mag=17.60+/-0.15 dist=88.1 REFID=4 flag=3
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 25537.410 counts in the bkg source region of 5869.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 4.351 counts/pixel (5-sig UL in 4" is 19.67 mag) for 844015_g319
There are 869.43799 counts in the xrt source region of 200.00000 pixels.
Rate in xrt region with 8 arcsec radius is 4.347 counts/pixel for 844015_g319
There are 4780.4639 counts in the xrt_bkg source region of 1085.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 4.406 counts/pixel (5-sig UL in 4" is 19.66 mag) for 844015_g319
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 20.22, 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_551465236_180623d21h27m16s606851usUT_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(214.5274,-60.2554,45")
fk5;-circle(214.525205326696,-60.2494560963112,6")
fk5;-circle(214.524810529037,-60.2579215151422,6")
fk5;-circle(214.542304113963,-60.2442121202961,6")
fk5;-circle(214.53899297116,-60.2626048932314,6")
fk5;-circle(214.529558902316,-60.2676377461979,6")
fk5;-circle(214.502188767397,-60.2591561097617,6")
Region file: 844015_551465236_180623d21h27m16s606851usUT_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_551465236_180623d21h27m16s606851usUT_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(214.525205326696,-60.2494560963112,6")
fk5;-circle(214.524810529037,-60.2579215151422,6")
image paragraph message for exposure 2 of trigger 844015
SRCLIST PROBLEM: srclist filled telemetry buffer
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 250 seconds with the U filter starting
299 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 19.2 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 18.0 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 180623d21h27m22s916760usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=844015
-expid=551465236 -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. XRT position found for srclist. XRT position found for Genie
image. BAT position found.
UVOT exposure began at MET 551465236.58752 or about 2018:174:16:47:11 UT
Found 1594 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 98 srclist
source(s) without IDs. There are 0 good candidate(s) in the srclist catalog.
Good candidates must be brighter than 18.12 mag.
Found 18 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 20.22 mag. Found 299 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
27% of the Genie image region.
Genie image analysis:
Found 25537.4 counts in the large background region of 5869.0 pixels or a rate
of 4.351 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 19.71 mag. for a
4-arcsec aperture.
Found 869.4 counts in the XRT position region of 200.0 pixels or a rate of
4.347 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is -0.047 +/- 0.128 (1-sigma) cps. The
3-sigma UL at the XRT position is 0.385 cps or 19.42 mag. The number of srclist
sources filled the available telemetry. The weakest source detected was 18.75
mag. The closest srclist source has ra= 214.5423 dec= -60.2443 mag=18.03
sep=41.16". The closest Genie source has ra= 214.5252 dec= -60.2495 mag=18.67
sep=16.00".
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?
551465236 298 U srclist found no candidates.
551465236 298 U image found no candidates.
List afterglow candidates for other finding charts.
551465023 85 WHITE srclist found no candidates.
551465023 85 WHITE image found no candidates.
551465815 877 WHITE srclist found no candidates.
551465815 877 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: -60.25353
GRB_ERROR: 5
GRB_RA: 214.52879
IMAGE_START_TIME: 16:47:11
MAGNITUDE: 19.4
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT