image overlap message for exposure 1 of trigger 969823
uvot_overlap.pl vrs. 2010-12-20b fem started at 200506d17h54m54s634275usUT
The observation of trigger 969823 started 2020-05-06T17:38:20.6
Examining file ./969823_g90_uvot_sky_image.fits
The exposure ID is 610479500
The exposure time is 149.857 (seconds)
The filter is WHITE.
The uvot region is centered at (274.5029,-16.1522) with a roll angle of 81.7
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 (274.4980,-16.1520) with a radius of 3.000 arc min
This is 0.281 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 (274.5007,-16.1312) with a radius of 0.060 arc min
This is 1.267 arc min from the center of the uvot region
The area of the XRT error circle is 0.011 sq. arc min
The UVOT/XRT overlap is 0.011 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 1 of trigger 969823
find_uvot_ag.pl vrs. 2017-02-17 fem started at 200506d17h54m58s649257usUT
Observation start time is 2020-05-06T17:38:20.6
Examining file ./969823_g90_uvot_catalog_image.fits
The exposure ID is 610479500
The exposure is 149.857 sec.
The bin size is 2 pixels
The filter is WHITE
There are 43 detected source(s) for 969823_g90
Aspect correction adds 0.00190 degrees (0.455 sec of time = 6.56 arc sec) to RA
Aspect correction adds -0.00100 degrees (-3.60 arcsec) to Dec
Total aspect correction is 7.48 arcsec
Star catalogs centered at 274.5037 , -16.1515 with radius 2.63 arc min.
n_usno: 337 n_gsc: 0
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 10.60322
RA DEC Mag Color
bright star 0: 274.49509 (18:17:58.82) -16.11858 (-16:07:06.9) 10.60 USNO-V
Mean distance difference (CAT_DELTA) for 43 matched entries is 0.476" for 969823_g90
Mean and std. dev of mag. difference (MAG_DELTA) are 1.240 and 0.586 for 969823_g90
Found 1 entries without IDs and 1 entries that are acceptable afterglow candidates for 969823_g90.
Acceptable entries have no ID, XRT distances < 9", 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=274.4980 (18:17:59.52) DEC=-16.1520 (-16:09:07.2)
XRT distances are from RA=274.5007 (18:18:00.18) DEC=-16.1312 (-16:07:52.3)
-----------------
Entry 32 in the list of sources is a candidate afterglow for 969823_g90 with genie
ra=274.48002 (18:17:55.20) dec=-16.16602 (-16:09:57.7) +/- 0.6" mag=18.58+/-0.15
dist=144.4 REFID=39 major=2.1 minor=1.9 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 80.1 arc sec from the BAT position.
This source is near the edge of image (0.928)
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
274.4853 -16.1644 19.0 -1 USNO-B1 12.93 12.16 12.50
274.4837 -16.1670 13.3 -1 USNO-B1 19.97 16.88 18.25
*** If XRT position is correct, then this is NOT the afterglow
*** unacceptable major profile of 2.1
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
274.5027 -16.1330 9.4 -1 USNO-B1 19.41 17.21 18.19
274.4995 -16.1332 8.3 -1 USNO-B1 19.68 16.75 18.05
The closest star is 8.28" away.
List UVOT sources within 10" of the XRT position:
There are 1.1767502E+05 counts in the bkg source region of 5447.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 21.604 counts/pixel (5-sig UL in 4" is 19.68 mag) for 969823_g90
There are 4460.5635 counts in the xrt source region of 199.00000 pixels.
Rate in xrt region with 8 arcsec radius is 22.415 counts/pixel for 969823_g90
XRT source is too far (76.0004991474544") 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 20.24, XRT distances < 9",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 969823_610479500_200506d17h54m58s649257usUT_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(274.5029,-16.1522,45")
fk5;-circle(274.49583317696,-16.1524242281338,6")
fk5;-circle(274.491815235718,-16.151181342077,6")
fk5;-circle(274.49293456165,-16.1596372440183,6")
fk5;-circle(274.495851449423,-16.1430006854172,6")
fk5;-circle(274.499310097527,-16.1424063534481,6")
fk5;-circle(274.503907288705,-16.1602229270694,6")
fk5;-circle(274.508681048077,-16.1567815005962,6")
fk5;-circle(274.504081456833,-16.163137200813,6")
fk5;-circle(274.503077051977,-16.1651419273151,6")
fk5;-circle(274.512721922055,-16.1422535588448,6")
fk5;-circle(274.516047153352,-16.1468584125999,6")
Region file: 969823_610479500_200506d17h54m58s649257usUT_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(274.50075,-16.13119,8")
image paragraph message for exposure 1 of trigger 969823
SRCLIST PROBLEM: srclist filled telemetry buffer
WARNING -- because of the LARGE EXTINCTION, results should be used cautiously.
------ Start for Possible Stand-alone Circular ----
In response to GRB200506 (Swift/BAT trigger 969823) at 17:36:49 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 65 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 large, but uncertain, extinction expected.
------- notes for trigger 969823 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 200506d17h55m11s719815usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=969823
-expid=610479500 -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/969823/
Links to data for all triggers can be found at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/
Unreliable extinction found for bat position. Unreliable extinction found for
xrt position. XRT position found for srclist. XRT position found for Genie
image. BAT position found.
UVOT exposure began at MET 610479500.55838 or about 2020:127:17:38:15 UT
Found 1911 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 31% of the srclist region. Found 190 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 17 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 43 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 20.24 mag. Found 333 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
33% of the Genie image region.
Genie image analysis:
Found 117675.0 counts in the large background region of 5447.0 pixels or a rate
of 21.604 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 4460.6 counts in the XRT position region of 199.0 pixels or a rate of
22.415 counts/pixel in a radius of 8.0 arcsec. The net count rate (using large
background region) at the XRT position is 1.077 +/- 0.453 (1-sigma) cps or
19.70 mag and a range from 19.32 to 20.29 mag. The 3-sigma UL at the XRT
position is 2.436 cps or 18.81 mag. The number of srclist sources filled the
available telemetry. The weakest source detected was 18.93 mag. The closest
srclist source has ra= 274.5014 dec= -16.1344 mag=16.88 sep=11.79". The closest
Genie source has ra= 274.5039 dec= -16.1306 mag=19.75 sep=11.04".
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?
610479500 65 WHITE srclist found no candidates.
610479500 65 WHITE image found no candidates.
List afterglow candidates for other finding charts.
610479712 277 U srclist found no candidates.
610479712 277 ? image data are not available.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: -16.13119
GRB_ERROR: 9
GRB_RA: 274.50075
IMAGE_START_TIME: 17:38:15
MAGNITUDE: 18.8
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT