image overlap message for exposure 1 of trigger 811167
uvot_overlap.pl vrs. 2010-12-20b fem started at 180222d00h59m48s561477usUT
The observation of trigger 811167 started 2018-02-22T00:51:55.4
Examining file 811167_g1887_uvot_sky_image.fits
The exposure ID is 540953515
The exposure time is 103.953 (seconds)
The filter is WHITE.
The uvot region is centered at (273.3947,-9.5324) with a roll angle of 96.6
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 (273.3870,-9.5010) with a radius of 3.000 arc min
This is 1.936 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 6.40 sq. arc min or 0.23 of the BAT error circle
The XRT error circle is centered at (273.3916,-9.5305) with a radius of 0.095 arc min
This is 0.216 arc min from the center of the uvot region
The area of the XRT error circle is 0.028 sq. arc min
The UVOT/XRT overlap is 0.028 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 1 of trigger 811167
find_uvot_ag.pl vrs. 2017-02-17 fem started at 180222d00h59m49s451402usUT
Observation start time is 2018-02-22T00:51:55.4
Examining file 811167_g1887_uvot_catalog_image.fits
The exposure ID is 540953515
The exposure is 103.953 sec.
The bin size is 2 pixels
The filter is WHITE
There are 6 detected source(s) for 811167_g1887
Aspect correction adds -0.00021 degrees (-0.051 sec of time = -0.75 arc sec) to RA
Aspect correction adds -0.00033 degrees (-1.17 arcsec) to Dec
Total aspect correction is 1.39 arcsec
Star catalogs centered at 273.3973 , -9.5314 with radius 2.49 arc min.
n_usno: 277 n_gsc: 421
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 6 matched entries is 0.553" for 811167_g1887
Mean and std. dev of mag. difference (MAG_DELTA) are 2.119 and 0.423 for 811167_g1887
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 811167_g1887.
Acceptable entries have no ID, XRT distances < 14.25", 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=273.3870 (18:13:32.88) DEC=-9.5010 (-09:30:03.6)
XRT distances are from RA=273.3916 (18:13:33.98) DEC=-9.5305 (-09:31:49.8)
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
273.3913 -9.5331 9.4 -1 USNO-B1 99.99 18.34 99.99
273.3914 -9.5329 8.6 -1 GSC2.3 18.75 99.99 99.99
The closest star is 8.62" away.
List UVOT sources within 10" of the XRT position:
There are 1.8957152E+05 counts in the bkg source region of 6085.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 31.154 counts/pixel (5-sig UL in 4" is 19.09 mag) for 811167_g1887
There are 6194.6963 counts in the xrt source region of 200.00000 pixels.
Rate in xrt region with 8 arcsec radius is 30.973 counts/pixel for 811167_g1887
There are 38663.680 counts in the xrt_bkg source region of 1239.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 31.206 counts/pixel (5-sig UL in 4" is 19.08 mag) for 811167_g1887
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 19.64, XRT distances < 14.25",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 811167_540953515_180222d00h59m49s451402usUT_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(273.3947,-9.5324,45")
fk5;-circle(273.395719941114,-9.52356972122643,6")
fk5;-circle(273.404482532506,-9.53095319840486,6")
Region file: 811167_540953515_180222d00h59m49s451402usUT_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(273.3916,-9.5305,8")
Region file: 811167_540953515_180222d00h59m49s451402usUT_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(273.3916,-9.5305,25")
fk5;-circle(273.3916,-9.5305,15")
fk5;-circle(273.395719941114,-9.52356972122643,6")
image paragraph message for exposure 1 of trigger 811167
WARNING -- because of the LARGE EXTINCTION, results should be used cautiously.
------ Start for Possible Stand-alone Circular ----
In response to GRB180222 (Swift/BAT trigger 811167) at 00:20:27 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 104 seconds with the White filter
starting 1867 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 811167 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 180222d00h59m51s076946usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=811167
-expid=540953515 -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/811167/
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 540953515.35218 or about 2018:053:00:51:50 UT
Found 2259 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 40% of the srclist region. Found 38 sources in
srclist catalog. Found 16 srclist source(s) without IDs. There are 0 good
candidate(s) in the srclist catalog. Good candidates must be brighter than
19.02 mag.
Found 6 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 19.64 mag. Found 358 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 40% of the
Genie image region.
Genie image analysis:
Found 189571.5 counts in the large background region of 6085.0 pixels or a rate
of 31.154 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 19.09 mag. for a
4-arcsec aperture.
Found 6194.7 counts in the XRT position region of 200.0 pixels or a rate of
30.973 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is -0.446 +/- 0.816 (1-sigma) cps. The
3-sigma UL at the XRT position is 2.448 cps or 18.81 mag. The closest srclist
source has ra= 273.3873 dec= -9.5291 mag=19.28 sep=16.18". The closest Genie
source has ra= 273.3957 dec= -9.5236 mag=18.79 sep=28.92".
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?
540953515 1867 WHITE srclist found no candidates.
540953515 1867 WHITE image found no candidates.
List afterglow candidates for other finding charts.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: -9.53050
GRB_ERROR: 14.25
GRB_RA: 273.39160
IMAGE_START_TIME: 00:51:50
MAGNITUDE: 18.8
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT