image overlap message for exposure 3 of trigger 846868
uvot_overlap.pl vrs. 2010-12-20b fem started at 180709d14h27m38s366134usUT
The observation of trigger 846868 started 2018-07-09T11:06:57.5
Examining file ./846868_g896_uvot_sky_image.fits
The exposure ID is 552827217
The exposure time is 149.857 (seconds)
The filter is WHITE.
The uvot region is centered at (38.1236,60.3501) with a roll angle of 95.2
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 (38.1190,60.3720) with a radius of 3.000 arc min
This is 1.322 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 7.12 sq. arc min or 0.25 of the BAT error circle
The XRT error circle is centered at (38.1178,60.3491) with a radius of 0.030 arc min
This is 0.181 arc min from the center of the uvot region
The area of the XRT error circle is 0.003 sq. arc min
The UVOT/XRT overlap is 0.003 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 3 of trigger 846868
find_uvot_ag.pl vrs. 2017-02-17 fem started at 180709d14h28m05s730995usUT
Observation start time is 2018-07-09T11:06:57.5
Examining file ./846868_g896_uvot_catalog_image.fits
The exposure ID is 552827217
The exposure is 149.857 sec.
The bin size is 2 pixels
The filter is WHITE
There are 5 detected source(s) for 846868_g896
Aspect correction adds 0.00058 degrees (0.139 sec of time = 1.03 arc sec) to RA
Aspect correction adds 0.00062 degrees ( 2.24 arcsec) to Dec
Total aspect correction is 2.46 arcsec
Star catalogs centered at 38.1307 , 60.3499 with radius 2.39 arc min.
n_usno: 63 n_gsc: 101
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 6 matched entries is 0.430" for 846868_g896
Mean and std. dev of mag. difference (MAG_DELTA) are 0.658 and 0.321 for 846868_g896
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 846868_g896.
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.
Magnitude criteria will be applied later.
BAT distances are from RA=38.1190 (02:32:28.56) DEC=60.3720 (+60:22:19.2)
XRT distances are from RA=38.1178 (02:32:28.28) DEC=60.3491 (+60:20:56.8)
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
There are 1.0111463E+05 counts in the bkg source region of 6307.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 16.032 counts/pixel (5-sig UL in 4" is 19.84 mag) for 846868_g896
There are 3098.2542 counts in the xrt source region of 197.00000 pixels.
Rate in xrt region with 8 arcsec radius is 15.727 counts/pixel for 846868_g896
There are 19803.682 counts in the xrt_bkg source region of 1242.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 15.945 counts/pixel (5-sig UL in 4" is 19.85 mag) for 846868_g896
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 20.40, 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: 846868_552827217_180709d14h28m05s730995usUT_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(38.1236,60.3501,45")
Region file: 846868_552827217_180709d14h28m05s730995usUT_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(38.11783,60.34911,8")
Region file: 846868_552827217_180709d14h28m05s730995usUT_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(38.11783,60.34911,25")
fk5;-circle(38.11783,60.34911,15")
image paragraph message for exposure 3 of trigger 846868
WARNING -- because of the LARGE EXTINCTION, results should be used cautiously.
------ Start for Possible Stand-alone Circular ----
In response to GRB180709 (Swift/BAT trigger 846868) at 10:52:00 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 875 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 large, but uncertain, extinction expected.
------- notes for trigger 846868 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 180709d14h28m09s629540usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=846868
-expid=552827217 -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/846868/
Links to data for all triggers can be found at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/
Large extinction of 9.58 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 552827217.45936 or about 2018:190:11:06:52 UT
Found 1503 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 12% of the srclist region. Found 101 sources in
srclist catalog. Found 8 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 5 source(s) in Genie image catalog. Found 0 Genie image source(s) without
IDs. There are 0 good candidate(s) in the Genie image catalog. Good candidates
must be brighter than 20.40 mag. Found 72 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 8% of the
Genie image region.
Genie image analysis:
Found 101114.6 counts in the large background region of 6307.0 pixels or a rate
of 16.032 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 19.84 mag. for a
4-arcsec aperture.
Found 3098.3 counts in the XRT position region of 197.0 pixels or a rate of
15.727 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is -0.286 +/- 0.400 (1-sigma) cps. The
3-sigma UL at the XRT position is 1.199 cps or 19.58 mag. The closest srclist
source has ra= 38.1101 dec= 60.3364 mag=15.89 sep=47.90". The closest Genie
source has ra= 38.1101 dec= 60.3364 mag=15.58 sep=47.88".
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?
552827217 875 WHITE srclist found no candidates.
552827217 875 WHITE image found no candidates.
List afterglow candidates for other finding charts.
552826455 113 WHITE srclist found no candidates.
552826455 113 WHITE image found no candidates.
552826614 272 U srclist found no candidates.
552826614 272 U image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: 60.34911
GRB_ERROR: 5
GRB_RA: 38.11783
IMAGE_START_TIME: 11:06:52
MAGNITUDE: 19.6
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT