image overlap message for exposure 2 of trigger 859282
uvot_overlap.pl vrs. 2010-12-20b fem started at 180904d23h20m04s278481usUT
The observation of trigger 859282 started 2018-09-04T21:33:43.3
Examining file ./859282_g310_uvot_sky_image.fits
The exposure ID is 557789623
The exposure time is 249.946 (seconds)
The filter is U.
The uvot region is centered at (274.2459,46.6270) with a roll angle of 289.9
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 (274.2500,46.6230) with a radius of 3.000 arc min
This is 0.292 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 (274.2498,46.6297) with a radius of 0.030 arc min
This is 0.229 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 859282
find_uvot_ag.pl vrs. 2017-02-17 fem started at 180904d23h20m13s535813usUT
Observation start time is 2018-09-04T21:33:43.3
Examining file ./859282_g310_uvot_catalog_image.fits
The exposure ID is 557789623
The exposure is 249.946 sec.
The bin size is 2 pixels
The filter is U
There are 6 detected source(s) for 859282_g310
Aspect correction adds 0.00068 degrees (0.164 sec of time = 1.69 arc sec) to RA
Aspect correction adds -0.00049 degrees (-1.77 arcsec) to Dec
Total aspect correction is 2.45 arcsec
Star catalogs centered at 274.2523 , 46.6315 with radius 2.37 arc min.
n_usno: 70 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 6 matched entries is 0.378" for 859282_g310
Mean and std. dev of mag. difference (MAG_DELTA) are 0.588 and 0.222 for 859282_g310
Found 1 entries without IDs and 1 entries that are acceptable afterglow candidates for 859282_g310.
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=274.2500 (18:17:00.00) DEC=46.6230 (+46:37:22.8)
XRT distances are from RA=274.2498 (18:16:59.95) DEC=46.6297 (+46:37:46.9)
-----------------
Entry 6 in the list of sources is a candidate afterglow for 859282_g310 with genie
ra=274.22097 (18:16:53.03) dec=46.63894 (+46:38:20.2) +/- 0.6" mag=16.84+/-0.14
dist=78.6 REFID=3 major=3.7 minor=2.0 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 91.9 arc sec from the BAT position.
This source is near the edge of image (0.906)
Found 3 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
274.2230 46.6421 12.5 -1 USNO-B1 20.16 19.64 19.87
274.2208 46.6422 11.8 -1 USNO-B1 19.68 19.73 19.71
274.2160 46.6423 17.1 -1 USNO-B1 12.55 12.23 12.37
*** If XRT position is correct, then this is NOT the afterglow
*** unacceptable major profile of 3.7
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
274.2518 46.6286 6.4 -1 USNO-B1 20.40 20.53 20.47
The closest star is 6.37" away.
List UVOT sources within 10" of the XRT position:
There are 8860.3242 counts in the bkg source region of 6195.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 1.430 counts/pixel (5-sig UL in 4" is 20.27 mag) for 859282_g310
There are 321.56433 counts in the xrt source region of 199.00000 pixels.
Rate in xrt region with 8 arcsec radius is 1.616 counts/pixel for 859282_g310
There are 1722.5168 counts in the xrt_bkg source region of 1221.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 1.411 counts/pixel (5-sig UL in 4" is 20.28 mag) for 859282_g310
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 20.83, 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: 859282_557789623_180904d23h20m13s535813usUT_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(274.2459,46.6270,45")
fk5;-circle(274.241813994365,46.6243750463795,6")
Region file: 859282_557789623_180904d23h20m13s535813usUT_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(274.24979,46.62969,8")
Region file: 859282_557789623_180904d23h20m13s535813usUT_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(274.24979,46.62969,25")
fk5;-circle(274.24979,46.62969,15")
fk5;-circle(274.241813994365,46.6243750463795,6")
image paragraph message for exposure 2 of trigger 859282
------ Start for Possible Stand-alone Circular ----
In response to GRB180904 (Swift/BAT trigger 859282) at 21:28:32 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
289 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
0.04.
------- notes for trigger 859282 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 180904d23h20m17s034760usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=859282
-expid=557789623 -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/859282/
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 557789623.30782 or about 2018:247:21:33:38 UT
Found 335 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 7% of the srclist region. Found 54 sources in
srclist catalog. Found 12 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 6 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 20.83 mag. Found 66 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 8% of the
Genie image region.
Genie image analysis:
Found 8860.3 counts in the large background region of 6195.0 pixels or a rate
of 1.430 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 20.31 mag. for a
4-arcsec aperture.
Found 321.6 counts in the XRT position region of 199.0 pixels or a rate of
1.616 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 0.163 +/- 0.077 (1-sigma) cps or
20.35 mag and a range from 19.93 to 21.03 mag. The 3-sigma UL at the XRT
position is 0.393 cps or 19.39 mag. The closest srclist source has ra= 274.2417
dec= 46.6243 mag=16.47 sep=27.90". The closest Genie source has ra= 274.2418
dec= 46.6244 mag=15.64 sep=27.48".
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?
557789623 289 U srclist found no candidates.
557789623 289 U image found no candidates.
List afterglow candidates for other finding charts.
557789465 131 WHITE srclist found no candidates.
557789465 131 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: 46.62969
GRB_ERROR: 5
GRB_RA: 274.24979
IMAGE_START_TIME: 21:33:38
MAGNITUDE: 19.4
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT