image overlap message for exposure 2 of trigger 948361
uvot_overlap.pl vrs. 2010-12-20b fem started at 200109d10h12m30s052303usUT
The observation of trigger 948361 started 2020-01-09T01:51:08.3
Examining file ./948361_g291_uvot_sky_image.fits
The exposure ID is 600227468
The exposure time is 249.946 (seconds)
The filter is U.
The uvot region is centered at (307.1252,52.9906) with a roll angle of 196.5
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 (307.1710,53.0030) with a radius of 3.000 arc min
This is 1.813 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 6.60 sq. arc min or 0.23 of the BAT error circle
The XRT error circle is centered at (307.1246,52.9936) with a radius of 0.028 arc min
This is 0.186 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 948361
find_uvot_ag.pl vrs. 2017-02-17 fem started at 200109d10h12m44s399261usUT
Observation start time is 2020-01-09T01:51:08.3
Examining file ./948361_g291_uvot_catalog_image.fits
The exposure ID is 600227468
The exposure is 249.946 sec.
The bin size is 2 pixels
The filter is U
There are 27 detected source(s) for 948361_g291
Aspect correction adds -0.00139 degrees (-0.333 sec of time = -3.00 arc sec) to RA
Aspect correction adds -0.00080 degrees (-2.89 arcsec) to Dec
Total aspect correction is 4.17 arcsec
Star catalogs centered at 307.1277 , 52.9872 with radius 2.66 arc min.
n_usno: 433 n_gsc: 0
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 11.43
RA DEC Mag Color
bright star 0: 307.12100 (20:28:29.04) 52.95205 (+52:57:07.4) 11.43 USNO-R
Mean distance difference (CAT_DELTA) for 27 matched entries is 0.530" for 948361_g291
Mean and std. dev of mag. difference (MAG_DELTA) are 1.431 and 0.646 for 948361_g291
Found 1 entries without IDs and 1 entries that are acceptable afterglow candidates for 948361_g291.
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.
0 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=307.1710 (20:28:41.04) DEC=53.0030 (+53:00:10.8)
XRT distances are from RA=307.1246 (20:28:29.91) DEC=52.9936 (+52:59:37.1)
-----------------
Entry 4 in the list of sources is a candidate afterglow for 948361_g291 with genie
ra=307.11754 (20:28:28.21) dec=52.98507 (+52:59:06.2) +/- 0.6" mag=17.09+/-0.15
dist=34.5 REFID=16 major=1.0 minor=0.9 flag=3 (neighbor+blended)
*** The position of this source is inconsistent with the XRT position.
The position is 132.6 arc sec from the BAT position.
Found 9 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
307.1250 52.9861 16.6 -1 USNO-B1 19.41 18.02 18.63
307.1206 52.9853 6.7 -1 USNO-B1 15.92 13.75 14.72
307.1242 52.9829 16.4 -1 USNO-B1 99.99 18.85 99.99
307.1184 52.9848 2.0 -1 USNO-B1 15.62 14.38 14.93 *
307.1166 52.9882 11.5 -1 USNO-B1 20.31 99.99 99.99
307.1187 52.9830 7.8 -1 USNO-B1 15.95 14.29 15.02
307.1117 52.9879 16.3 -1 USNO-B1 19.14 17.89 18.45
307.1128 52.9832 12.3 -1 USNO-B1 20.25 18.84 19.47
307.1120 52.9818 16.7 -1 USNO-B1 18.30 17.46 17.84
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 3.5" 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
307.1220 52.9955 8.8 -1 USNO-B1 20.88 20.24 20.52
The closest star is 8.79" away.
List UVOT sources within 10" of the XRT position:
There are 63193.191 counts in the bkg source region of 5503.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 11.483 counts/pixel (5-sig UL in 4" is 19.14 mag) for 948361_g291
There are 2334.5200 counts in the xrt source region of 198.00000 pixels.
Rate in xrt region with 8 arcsec radius is 11.791 counts/pixel for 948361_g291
There are 11534.088 counts in the xrt_bkg source region of 1027.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 11.231 counts/pixel (5-sig UL in 4" is 19.15 mag) for 948361_g291
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 19.69, 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: 948361_600227468_200109d10h12m44s399261usUT_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(307.1252,52.9906,45")
fk5;-circle(307.123871643658,52.996795232936,6")
fk5;-circle(307.133562980294,52.9930295310459,6")
fk5;-circle(307.128048205636,52.9880359120838,6")
fk5;-circle(307.120928354443,52.9853306344526,6")
fk5;-circle(307.117543434807,52.9850690059587,6")
fk5;-circle(307.118887253403,52.9828986061183,6")
fk5;-circle(307.124408398966,52.9804445044203,6")
fk5;-circle(307.112067442247,52.9818961910092,6")
Region file: 948361_600227468_200109d10h12m44s399261usUT_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(307.12462,52.99364,8")
Region file: 948361_600227468_200109d10h12m44s399261usUT_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(307.12462,52.99364,25")
fk5;-circle(307.12462,52.99364,15")
fk5;-circle(307.123871643658,52.996795232936,6")
fk5;-circle(307.133562980294,52.9930295310459,6")
fk5;-circle(307.128048205636,52.9880359120838,6")
fk5;-circle(307.120928354443,52.9853306344526,6")
image paragraph message for exposure 2 of trigger 948361
IMAGE PROBLEM: high density of stars
------ Start for Possible Stand-alone Circular ----
In response to GRB200109 (Swift/BAT trigger 948361) at 01:46:16 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
267 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. Because of the density of catalogued stars, further analysis
is required to report an upper limit for any afterglow in the sub-image. 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
0.29.
------- notes for trigger 948361 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 200109d10h12m48s305884usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=948361
-expid=600227468 -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/948361/
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 600227468.3232 or about 0000:9505:01:51:12 UT
Found 2238 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 38% of the srclist region. Found 161 sources in
srclist catalog. Found 9 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 27 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 19.69 mag. Found 429 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
42% of the Genie image region.
Genie image analysis:
Found 63193.2 counts in the large background region of 5503.0 pixels or a rate
of 11.483 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 19.18 mag. for a
4-arcsec aperture.
Found 2334.5 counts in the XRT position region of 198.0 pixels or a rate of
11.790 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 0.443 +/- 0.210 (1-sigma) cps or
19.26 mag and a range from 18.84 to 19.96 mag. The 3-sigma UL at the XRT
position is 1.074 cps or 18.30 mag. The closest srclist source has ra= 307.1239
dec= 52.9966 mag=17.90 sep=10.75". The closest Genie source has ra= 307.1239
dec= 52.9968 mag=17.55 sep=11.47".
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?
600227468 267 U srclist found no candidates.
600227468 267 U image found no candidates.
List afterglow candidates for other finding charts.
600227310 109 WHITE srclist found no candidates.
600227310 109 WHITE image found no candidates.
600228073 872 WHITE srclist found no candidates.
600228073 872 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: SRCLIST
FILTER: u
GRB_DEC: 52.99364
GRB_ERROR: 5
GRB_RA: 307.12462
MAGNITUDE: 18.0
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT