image overlap message for exposure 1 of trigger 997024
uvot_overlap.pl vrs. 2010-12-20b fem started at 200923d13h14m46s153236usUT
The observation of trigger 997024 started 2020-09-22T12:08:37.8
Examining file ./997024_g110_uvot_sky_image.fits
The exposure ID is 622469317
The exposure time is 149.857 (seconds)
The filter is WHITE.
The uvot region is centered at (296.9468,-55.2057) with a roll angle of 247.3
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 (296.9150,-55.2040) with a radius of 3.000 arc min
This is 1.095 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 (296.9536,-55.2044) with a radius of 0.133 arc min
This is 0.245 arc min from the center of the uvot region
The area of the XRT error circle is 0.056 sq. arc min
The UVOT/XRT overlap is 0.056 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 1 of trigger 997024
find_uvot_ag.pl vrs. 2017-02-17 fem started at 200923d13h14m56s248142usUT
Observation start time is 2020-09-22T12:08:37.8
Examining file ./997024_g110_uvot_catalog_image.fits
The exposure ID is 622469317
The exposure is 149.857 sec.
The bin size is 2 pixels
The filter is WHITE
There are 16 detected source(s) for 997024_g110
Aspect correction adds -0.00148 degrees (-0.355 sec of time = -3.04 arc sec) to RA
Aspect correction adds -0.00109 degrees (-3.94 arcsec) to Dec
Total aspect correction is 4.97 arcsec
Star catalogs centered at 296.9469 , -55.2042 with radius 2.87 arc min.
n_usno: 125 n_gsc: 0
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 11.87026
RA DEC Mag Color
bright star 0: 297.01374 (19:48:03.30) -55.19682 (-55:11:48.6) 11.87 USNO-V
Mean distance difference (CAT_DELTA) for 13 matched entries is 0.353" for 997024_g110
Mean and std. dev of mag. difference (MAG_DELTA) are 0.563 and 1.253 for 997024_g110
Found 3 entries without IDs and 3 entries that are acceptable afterglow candidates for 997024_g110.
Acceptable entries have no ID, XRT distances < 15", 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=296.9150 (19:47:39.60) DEC=-55.2040 (-55:12:14.4)
XRT distances are from RA=296.9536 (19:47:48.87) DEC=-55.2044 (-55:12:15.9)
-----------------
Entry 2 in the list of sources is a candidate afterglow for 997024_g110 with genie
ra=296.95581 (19:47:49.39) dec=-55.21682 (-55:13:00.5) +/- 0.6" mag=17.39+/-0.14
dist=44.9 REFID=15 major=5.0 minor=2.2 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 95.7 arc sec from the BAT position.
Found 2 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
296.9488 -55.2192 16.8 -1 USNO-B1 12.88 12.09 12.44
296.9548 -55.2193 9.0 -1 USNO-B1 19.89 21.43 20.74
*** If XRT position is correct, then this is NOT the afterglow
*** unacceptable major profile of 5.0
-----------------
Entry 9 in the list of sources is a candidate afterglow for 997024_g110 with genie
ra=296.96478 (19:47:51.55) dec=-55.22078 (-55:13:14.8) +/- 0.6" mag=18.30+/-0.15
dist=63.2 REFID=11 major=3.4 minor=1.3 flag=19 (neighbor+blended+aperture_incomplete)
*** The position of this source is inconsistent with the XRT position.
The position is 118.8 arc sec from the BAT position.
Found 0 entries in star catalog(s) within 20.0" of the candidate.
*** If XRT position is correct, then this is NOT the afterglow
*** unacceptable major profile of 3.4
-----------------
Entry 10 in the list of sources is a candidate afterglow for 997024_g110 with genie
ra=296.95643 (19:47:49.54) dec=-55.22182 (-55:13:18.5) +/- 0.6" mag=18.30+/-0.15
dist=62.9 REFID=16 major=1.7 minor=1.2 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 106.6 arc sec from the BAT position.
Found 6 entries in star catalog(s) within 20.0" of the candidate.
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
296.9488 -55.2192 18.3 -1 USNO-B1 12.88 12.09 12.44
296.9548 -55.2193 9.8 -1 USNO-B1 19.89 21.43 20.74
296.9492 -55.2227 15.2 -1 USNO-B1 19.90 12.02 15.52
296.9488 -55.2232 16.5 -1 USNO-B1 20.02 19.91 19.96
296.9488 -55.2239 17.4 -1 USNO-B1 20.12 19.96 20.03
296.9571 -55.2266 17.2 -1 USNO-B1 20.40 23.77 22.27
*** If XRT position is correct, then this is NOT the afterglow
*** unacceptable major profile of 1.7
Found 2 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
296.9538 -55.2044 0.5 -1 USNO-B1 18.26 17.84 18.03
296.9549 -55.2033 4.9 -1 USNO-B1 99.99 19.39 99.99
The closest star is 0.45" away.
List UVOT sources within 10" of the XRT position:
Matched source ra=296.95361 (19:47:48.87) dec=-55.20447 (-55:12:16.1) +/- 0.6" mag=14.40+/-0.14 dist=0.2 REFID=6 flag=0
There are 54504.250 counts in the bkg source region of 5747.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 9.484 counts/pixel (5-sig UL in 4" is 20.13 mag) for 997024_g110
There are 12874.053 counts in the xrt source region of 200.00000 pixels.
Rate in xrt region with 8 arcsec radius is 64.370 counts/pixel for 997024_g110
There are 12084.818 counts in the xrt_bkg source region of 1241.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 9.738 counts/pixel (5-sig UL in 4" is 20.11 mag) for 997024_g110
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 20.68, XRT distances < 15",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 997024_622469317_200923d13h14m56s248142usUT_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(296.9468,-55.2057,45")
fk5;-circle(296.953611206155,-55.204466009215,6")
fk5;-circle(296.967858046448,-55.205819195466,6")
fk5;-circle(296.955807523897,-55.2168186509261,6")
fk5;-circle(296.936474020763,-55.2091202198551,6")
fk5;-circle(296.943172221352,-55.2173279135898,6")
fk5;-circle(296.948928991151,-55.2192465416325,6")
fk5;-circle(296.935325158024,-55.2142482700257,6")
Region file: 997024_622469317_200923d13h14m56s248142usUT_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(296.95362,-55.20442,8")
Region file: 997024_622469317_200923d13h14m56s248142usUT_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(296.95362,-55.20442,25")
fk5;-circle(296.95362,-55.20442,15")
fk5;-circle(296.967858046448,-55.205819195466,6")
image paragraph message for exposure 1 of trigger 997024
1 source(s) near the XRT position were rejected as afterglow candidate(s). See
notes for details.
------ Start for Possible Stand-alone Circular ----
In response to GRB200922 (Swift/BAT trigger 997024) at 12:06:46 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 85 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 997024 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 200923d13h15m07s760153usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=997024
-expid=622469317 -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/997024/
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 622469317.7684 or about 2020:266:12:08:32 UT
Found 639 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 10% of the srclist region. Found 155 sources in
srclist catalog. Found 72 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 16 source(s) in Genie image catalog. 1 source(s) are within 10.0" of the
xrt position. Found 3 Genie image source(s) without IDs. There are 0 good
candidate(s) in the Genie image catalog. Good candidates must be brighter than
20.68 mag. Found 121 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 10% of the Genie image region.
Genie image analysis:
Found 54504.2 counts in the large background region of 5747.0 pixels or a rate
of 9.484 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 20.13 mag. for a
4-arcsec aperture.
Found 12874.1 counts in the XRT position region of 200.0 pixels or a rate of
64.371 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 72.843 +/- 0.766 (1-sigma) cps or
15.12 mag and a range from 15.11 to 15.14 mag. The 3-sigma UL at the XRT
position is 75.140 cps or 15.09 mag.
Found 1 srclist source(s) within 10.0" of the XRT position.
The brightest such source has ra= 296.9537 dec= -55.2047 mag=15.01 sep=0.83".
The closest srclist source has ra= 296.9537 dec= -55.2047 mag=15.01 sep=0.83".
Found 1 Genie source(s) within 10.0" of the XRT position. The brightest such
source has ra= 296.9536 dec= -55.2045 mag=14.40 sep=0.17". The closest Genie
source has ra= 296.9536 dec= -55.2045 mag=14.40 sep=0.17".
Report rejected UVOT sources within 10 arcsec XRT position.
Such sources are usually NOT the afterglow.
****THIS SOURCE NEAR XRT POSITION WAS REJECTED--USE WITH CAUTION****
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 85 seconds after the BAT trigger. There is a candidate afterglow in
the rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 19:47:48.87 = 296.95361
DEC(J2000) = -55:12:16.1 = -55.20447
with a 90%-confidence error radius of about 0.61 arc sec. This position is 0.17
arc sec. from the center of the XRT error circle. The estimated magnitude is
14.40 with a 1-sigma error of about 0.14. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.05.
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?
622469317 84 WHITE srclist found no candidates.
622469317 84 WHITE image found no candidates.
List afterglow candidates for other finding charts.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: -55.20442
GRB_ERROR: 15
GRB_RA: 296.95362
IMAGE_START_TIME: 12:08:32
MAGNITUDE: 15.1
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT