image overlap message for exposure 2 of trigger 994856
uvot_overlap.pl vrs. 2010-12-20b fem started at 200906d21h24m22s060576usUT
The observation of trigger 994856 started 2020-09-06T13:16:18.3
Examining file ./994856_g313_uvot_sky_image.fits
The exposure ID is 621090978
The exposure time is 249.935 (seconds)
The filter is U.
The uvot region is centered at (272.2643,67.8797) 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 1.783 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 6.69 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 0.251 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 2 of trigger 994856
find_uvot_ag.pl vrs. 2017-02-17 fem started at 200906d21h24m39s435182usUT
Observation start time is 2020-09-06T13:16:18.3
Examining file ./994856_g313_uvot_catalog_image.fits
The exposure ID is 621090978
The exposure is 249.935 sec.
The bin size is 2 pixels
The filter is U
There are 10 detected source(s) for 994856_g313
Aspect correction adds -0.00389 degrees (-0.933 sec of time = -5.27 arc sec) to RA
Aspect correction adds 0.00049 degrees ( 1.78 arcsec) to Dec
Total aspect correction is 5.56 arcsec
Star catalogs centered at 272.2698 , 67.8771 with radius 2.33 arc min.
n_usno: 122 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 15 matched entries is 0.657" for 994856_g313
Mean and std. dev of mag. difference (MAG_DELTA) are 1.394 and 1.178 for 994856_g313
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 994856_g313.
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 8044.5659 counts in the bkg source region of 6042.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 1.331 counts/pixel (5-sig UL in 4" is 20.31 mag) for 994856_g313
There are 247.64897 counts in the xrt source region of 199.00000 pixels.
Rate in xrt region with 8 arcsec radius is 1.244 counts/pixel for 994856_g313
There are 1577.4486 counts in the xrt_bkg source region of 1179.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 1.338 counts/pixel (5-sig UL in 4" is 20.31 mag) for 994856_g313
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 20.86, 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_621090978_200906d21h24m39s435182usUT_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(272.2643,67.8797,45")
fk5;-circle(272.292514356647,67.8811998250009,6")
fk5;-circle(272.274709131168,67.8918689427163,6")
fk5;-circle(272.247682806568,67.8878020174177,6")
Region file: 994856_621090978_200906d21h24m39s435182usUT_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_621090978_200906d21h24m39s435182usUT_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(272.292514356647,67.8811998250009,6")
image paragraph message for exposure 2 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 250 seconds with the U filter starting
288 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 expected extinction corresponding to E(B-V) of
0.05.
------- notes for trigger 994856 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 200906d21h24m44s107355usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=994856
-expid=621090978 -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 621090978.33882 or about 2020:250:13:16:13 UT
Found 633 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 11% of the srclist region. Found 35 sources in
srclist catalog. Found 1 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 10 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 20.86 mag. Found 118 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
15% of the Genie image region.
Genie image analysis:
Found 8044.6 counts in the large background region of 6042.0 pixels or a rate
of 1.331 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 20.35 mag. for a
4-arcsec aperture.
Found 247.6 counts in the XRT position region of 199.0 pixels or a rate of
1.244 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is -0.075 +/- 0.068 (1-sigma) cps. The
3-sigma UL at the XRT position is 0.205 cps or 20.10 mag. The closest srclist
source has ra= 272.2928 dec= 67.8816 mag=19.46 sep=24.33". The closest Genie
source has ra= 272.2925 dec= 67.8812 mag=19.03 sep=23.67".
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?
621090978 288 U srclist found no candidates.
621090978 288 U image found no candidates.
List afterglow candidates for other finding charts.
621090766 76 WHITE srclist found no candidates.
621090766 76 WHITE 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: u
GRB_DEC: 67.88003
GRB_ERROR: 5
GRB_RA: 272.27533
IMAGE_START_TIME: 13:16:13
MAGNITUDE: 20.1
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT