image overlap message for exposure 2 of trigger 996184
uvot_overlap.pl vrs. 2010-12-20b fem started at 200917d06h38m59s651797usUT
The observation of trigger 996184 started 2020-09-17T03:57:16.2
Examining file ./996184_g287_uvot_sky_image.fits
The exposure ID is 622007836
The exposure time is 249.935 (seconds)
The filter is U.
The uvot region is centered at (235.7488,-4.6960) with a roll angle of 275.0
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 (235.7530,-4.6950) with a radius of 3.000 arc min
This is 0.260 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 7.17 sq. arc min or 0.25 of the BAT error circle
The XRT error circle is centered at (235.7243,-4.7006) with a radius of 0.032 arc min
This is 1.487 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 996184
find_uvot_ag.pl vrs. 2017-02-17 fem started at 200917d06h39m11s281330usUT
Observation start time is 2020-09-17T03:57:16.2
Examining file ./996184_g287_uvot_catalog_image.fits
The exposure ID is 622007836
The exposure is 249.935 sec.
The bin size is 2 pixels
The filter is U
There are 3 detected source(s) for 996184_g287
Aspect correction adds -0.00121 degrees (-0.291 sec of time = -4.35 arc sec) to RA
Aspect correction adds 0.00090 degrees ( 3.24 arcsec) to Dec
Total aspect correction is 5.42 arcsec
Star catalogs centered at 235.7539 , -4.6992 with radius 2.31 arc min.
n_usno: 46 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 3 matched entries is 0.471" for 996184_g287
Mean and std. dev of mag. difference (MAG_DELTA) are 1.361 and 1.317 for 996184_g287
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 996184_g287.
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=235.7530 (15:43:00.72) DEC=-4.6950 (-04:41:42.0)
XRT distances are from RA=235.7243 (15:42:53.84) DEC=-4.7006 (-04:42:02.1)
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
There are 28538.613 counts in the bkg source region of 6196.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 4.606 counts/pixel (5-sig UL in 4" is 19.64 mag) for 996184_g287
There are 879.64008 counts in the xrt source region of 202.00000 pixels.
Rate in xrt region with 8 arcsec radius is 4.355 counts/pixel for 996184_g287
XRT source is too far (89.3310791155762") from center -- do not compute local background.
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 20.19, 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: 996184_622007836_200917d06h39m11s281330usUT_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(235.7488,-4.6960,45")
fk5;-circle(235.755750298837,-4.70251239256134,6")
Region file: 996184_622007836_200917d06h39m11s281330usUT_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(235.72433,-4.70058,8")
image paragraph message for exposure 2 of trigger 996184
------ Start for Possible Stand-alone Circular ----
In response to GRB200917 (Swift/BAT trigger 996184) at 03:52:28 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
262 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
0.19.
------- notes for trigger 996184 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 200917d06h39m14s832577usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=996184
-expid=622007836 -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/996184/
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 622007836.19602 or about 2020:261:03:57:11 UT
Found 608 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 5% of the srclist region. Found 62 sources in
srclist catalog. Found 3 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 3 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 20.19 mag. Found 42 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 5% of the
Genie image region.
Genie image analysis:
Found 28538.6 counts in the large background region of 6196.0 pixels or a rate
of 4.606 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 19.68 mag. for a
4-arcsec aperture.
Found 879.6 counts in the XRT position region of 202.0 pixels or a rate of
4.354 counts/pixel in a radius of 8.0 arcsec. The net count rate (using large
background region) at the XRT position is -0.203 +/- 0.121 (1-sigma) cps. The
3-sigma UL at the XRT position is 0.362 cps or 19.48 mag. The closest srclist
source has ra= 235.7358 dec= -4.7201 mag=17.92 sep=81.43". The closest Genie
source has ra= 235.7400 dec= -4.7162 mag=20.35 sep=79.45".
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?
622007836 262 U srclist found no candidates.
622007836 262 U image found no candidates.
List afterglow candidates for other finding charts.
622007678 104 WHITE srclist found no candidates.
622007678 104 WHITE image found no candidates.
622008438 864 WHITE srclist found no candidates.
622008438 864 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: -4.70058
GRB_ERROR: 5
GRB_RA: 235.72433
IMAGE_START_TIME: 03:57:11
MAGNITUDE: 19.5
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT