image overlap message for exposure 2 of trigger 994165
uvot_overlap.pl vrs. 2010-12-20b fem started at 200901d14h53m06s193976usUT
The observation of trigger 994165 started 2020-09-01T07:24:06.8
Examining file ./994165_g879_uvot_sky_image.fits
The exposure ID is 620637846
The exposure time is 108.402 (seconds)
The filter is U.
The uvot region is centered at (217.8528,-38.7117) with a roll angle of 298.3
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 (217.8790,-38.7160) with a radius of 3.000 arc min
This is 1.256 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 7.14 sq. arc min or 0.25 of the BAT error circle
The XRT error circle is centered at (217.8591,-38.7115) with a radius of 0.070 arc min
This is 0.299 arc min from the center of the uvot region
The area of the XRT error circle is 0.015 sq. arc min
The UVOT/XRT overlap is 0.015 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 2 of trigger 994165
find_uvot_ag.pl vrs. 2017-02-17 fem started at 200901d14h53m24s114886usUT
Observation start time is 2020-09-01T07:24:06.8
Examining file ./994165_g879_uvot_catalog_image.fits
The exposure ID is 620637846
The exposure is 108.402 sec.
The bin size is 2 pixels
The filter is U
There are 16 detected source(s) for 994165_g879
Aspect correction adds -0.00013 degrees (-0.032 sec of time = -0.37 arc sec) to RA
Aspect correction adds 0.00006 degrees ( 0.22 arcsec) to Dec
Total aspect correction is 0.43 arcsec
Star catalogs centered at 217.8506 , -38.7158 with radius 2.50 arc min.
n_usno: 205 n_gsc: 0
*** WARNING -- bright star catalog has 2 entries brighter than 12 mag
The brightest has mag 11.85072
RA DEC Mag Color
bright star 0: 217.84867 (14:31:23.68) -38.69181 (-38:41:30.5) 11.85 USNO-V
bright star 1: 217.89782 (14:31:35.48) -38.72103 (-38:43:15.7) 11.95 USNO-R
Mean distance difference (CAT_DELTA) for 15 matched entries is 0.432" for 994165_g879
Mean and std. dev of mag. difference (MAG_DELTA) are 1.067 and 0.884 for 994165_g879
Found 1 entries without IDs and 1 entries that are acceptable afterglow candidates for 994165_g879.
Acceptable entries have no ID, XRT distances < 10.5", and are > 0.8*(80 - 10*(mag-6))" from any bright star
from any bright star and >21.6" from other rejected sources.
0 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=217.8790 (14:31:30.96) DEC=-38.7160 (-38:42:57.6)
XRT distances are from RA=217.8591 (14:31:26.19) DEC=-38.7115 (-38:42:41.3)
-----------------
Entry 14 in the list of sources is a candidate afterglow for 994165_g879 with genie
ra=217.81998 (14:31:16.80) dec=-38.71305 (-38:42:47.0) +/- 0.6" mag=16.48+/-0.15
dist=110.1 REFID=9 major=1.1 minor=0.9 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 166.1 arc sec from the BAT position.
This source is near the edge of image (1.029)
Found 7 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
217.8249 -38.7115 14.8 -1 USNO-B1 99.99 18.87 99.99
217.8241 -38.7164 16.5 -1 USNO-B1 19.49 17.88 18.59
217.8231 -38.7100 14.1 -1 USNO-B1 18.90 17.91 18.35
217.8190 -38.7125 3.5 -1 USNO-B1 16.40 15.28 15.77 *
217.8187 -38.7127 3.9 -1 USNO-B1 15.79 15.67 15.72 *
217.8180 -38.7127 5.7 -1 USNO-B1 99.99 16.65 99.99
217.8177 -38.7082 18.6 -1 USNO-B1 18.71 18.16 18.40
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 5.25" or brighter than 12 mag
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
217.8604 -38.7128 5.9 -1 USNO-B1 21.47 19.56 20.41
The closest star is 5.94" away.
List UVOT sources within 10" of the XRT position:
There are 10284.892 counts in the bkg source region of 5796.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 1.774 counts/pixel (5-sig UL in 4" is 19.25 mag) for 994165_g879
There are 387.94751 counts in the xrt source region of 201.00000 pixels.
Rate in xrt region with 8 arcsec radius is 1.930 counts/pixel for 994165_g879
There are 1949.6917 counts in the xrt_bkg source region of 1111.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 1.755 counts/pixel (5-sig UL in 4" is 19.25 mag) for 994165_g879
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 19.80, XRT distances < 10.5",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 994165_620637846_200901d14h53m24s114886usUT_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(217.8528,-38.7117,45")
fk5;-circle(217.857453890973,-38.7084732676515,6")
fk5;-circle(217.855011704691,-38.7170722342252,6")
fk5;-circle(217.86491768765,-38.7057351937282,6")
fk5;-circle(217.856329038768,-38.7022749064962,6")
fk5;-circle(217.854415119539,-38.6994239738859,6")
fk5;-circle(217.852546261245,-38.7251154549039,6")
Region file: 994165_620637846_200901d14h53m24s114886usUT_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(217.85913,-38.71147,8")
Region file: 994165_620637846_200901d14h53m24s114886usUT_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(217.85913,-38.71147,25")
fk5;-circle(217.85913,-38.71147,15")
fk5;-circle(217.857453890973,-38.7084732676515,6")
fk5;-circle(217.855011704691,-38.7170722342252,6")
fk5;-circle(217.86491768765,-38.7057351937282,6")
image paragraph message for exposure 2 of trigger 994165
------ Start for Possible Stand-alone Circular ----
In response to GRB200901 (Swift/BAT trigger 994165) at 07:09:26 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 108 seconds with the U filter starting
854 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
0.09.
------- notes for trigger 994165 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 200901d14h53m28s076028usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=994165
-expid=620637846 -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/994165/
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 620637846.84936 or about 2020:245:07:24:01 UT
Found 2090 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 19% of the srclist region. Found 156 sources in
srclist catalog. Found 27 srclist source(s) without IDs. There are 0 good
candidate(s) in the srclist catalog. Good candidates must be brighter than
17.66 mag.
Found 16 source(s) in Genie image catalog. Found 1 Genie image source(s)
without IDs. There are 0 good candidate(s) in the Genie image catalog. Good
candidates must be brighter than 19.80 mag. Found 201 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
22% of the Genie image region.
Genie image analysis:
Found 10284.9 counts in the large background region of 5796.0 pixels or a rate
of 1.774 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 19.28 mag. for a
4-arcsec aperture.
Found 387.9 counts in the XRT position region of 201.0 pixels or a rate of
1.930 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 0.326 +/- 0.197 (1-sigma) cps or
19.60 mag and a range from 19.09 to 20.61 mag. The 3-sigma UL at the XRT
position is 0.916 cps or 18.48 mag. The closest srclist source has ra= 217.8580
dec= -38.7087 mag=18.75 sep=10.44". The closest Genie source has ra= 217.8575
dec= -38.7085 mag=17.05 sep=11.77".
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?
620637846 854 U srclist found no candidates.
620637846 854 U image found no candidates.
List afterglow candidates for other finding charts.
620637167 175 U srclist found no candidates.
620637167 175 U image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: -38.71147
GRB_ERROR: 10.5
GRB_RA: 217.85913
IMAGE_START_TIME: 07:24:01
MAGNITUDE: 18.5
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT