image overlap message for exposure 1 of trigger 994856
uvot_overlap.pl vrs. 2010-12-20b fem started at 200906d21h24m21s058444usUT
The observation of trigger 994856 started 2020-09-06T13:12:46.2
Examining file ./994856_g101_uvot_sky_image.fits
The exposure ID is 621090766
The exposure time is 149.846 (seconds)
The filter is WHITE.
The uvot region is centered at (272.2668,67.8786) with a roll angle of 287.7
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 (272.2930,67.8520) with a radius of 3.000 arc min
This is 1.702 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 6.82 sq. arc min or 0.24 of the BAT error circle
The XRT error circle is centered at (272.2753,67.8800) with a radius of 0.032 arc min
This is 0.210 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 1 of trigger 994856
find_uvot_ag.pl vrs. 2017-02-17 fem started at 200906d21h24m29s536812usUT
Observation start time is 2020-09-06T13:12:46.2
Examining file ./994856_g101_uvot_catalog_image.fits
The exposure ID is 621090766
The exposure is 149.846 sec.
The bin size is 2 pixels
The filter is WHITE
There are 14 detected source(s) for 994856_g101
Aspect correction adds -0.00342 degrees (-0.821 sec of time = -4.64 arc sec) to RA
Aspect correction adds 0.00101 degrees ( 3.62 arcsec) to Dec
Total aspect correction is 5.89 arcsec
Star catalogs centered at 272.2632 , 67.8772 with radius 2.42 arc min.
n_usno: 125 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 20 matched entries is 0.587" for 994856_g101
Mean and std. dev of mag. difference (MAG_DELTA) are 0.966 and 1.049 for 994856_g101
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 994856_g101.
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=272.2930 (18:09:10.32) DEC=67.8520 (+67:51:07.2)
XRT distances are from RA=272.2753 (18:09:06.08) DEC=67.8800 (+67:52:48.1)
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
272.2701 67.8790 8.0 -1 USNO-B1 99.99 19.57 99.99
The closest star is 8.01" away.
List UVOT sources within 10" of the XRT position:
There are 30216.691 counts in the bkg source region of 5907.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 5.115 counts/pixel (5-sig UL in 4" is 20.46 mag) for 994856_g101
There are 1008.1024 counts in the xrt source region of 203.00000 pixels.
Rate in xrt region with 8 arcsec radius is 4.966 counts/pixel for 994856_g101
There are 5558.6152 counts in the xrt_bkg source region of 1109.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 5.012 counts/pixel (5-sig UL in 4" is 20.47 mag) for 994856_g101
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 21.02, 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: 994856_621090766_200906d21h24m29s536812usUT_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(272.2668,67.8786,45")
fk5;-circle(272.292371807758,67.8812874889894,6")
fk5;-circle(272.257990505853,67.8797878604129,6")
fk5;-circle(272.297542771803,67.8757979791997,6")
fk5;-circle(272.275156198812,67.891836841877,6")
fk5;-circle(272.247494871743,67.8878705340264,6")
Region file: 994856_621090766_200906d21h24m29s536812usUT_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(272.27533,67.88003,8")
Region file: 994856_621090766_200906d21h24m29s536812usUT_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(272.27533,67.88003,25")
fk5;-circle(272.27533,67.88003,15")
fk5;-circle(272.292371807758,67.8812874889894,6")
fk5;-circle(272.257990505853,67.8797878604129,6")
image paragraph message for exposure 1 of trigger 994856
------ Start for Possible Stand-alone Circular ----
In response to GRB200906 (Swift/BAT trigger 994856) at 13:11:04 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 76 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 994856 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 200906d21h24m35s111254usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=994856
-expid=621090766 -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/994856/
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 621090766.18682 or about 2020:250:13:12:41 UT
Found 630 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 11% of the srclist region. Found 73 sources in
srclist catalog. Found 4 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 14 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 21.02 mag. Found 121 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
14% of the Genie image region.
Genie image analysis:
Found 30216.7 counts in the large background region of 5907.0 pixels or a rate
of 5.115 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 20.46 mag. for a
4-arcsec aperture.
Found 1008.1 counts in the XRT position region of 203.0 pixels or a rate of
4.966 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is -0.063 +/- 0.230 (1-sigma) cps. The
3-sigma UL at the XRT position is 0.691 cps or 20.18 mag. The closest srclist
source has ra= 272.2921 dec= 67.8812 mag=18.63 sep=23.14". The closest Genie
source has ra= 272.2580 dec= 67.8798 mag=19.22 sep=23.52".
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?
621090766 76 WHITE srclist found no candidates.
621090766 76 WHITE image found no candidates.
List afterglow candidates for other finding charts.
621090978 288 U srclist found no candidates.
621090978 288 U image found no candidates.
621091556 866 WHITE srclist found no candidates.
621091556 866 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: 67.88003
GRB_ERROR: 5
GRB_RA: 272.27533
IMAGE_START_TIME: 13:12:41
MAGNITUDE: 20.2
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT