image overlap message for exposure 1 of trigger 868427
uvot_overlap.pl vrs. 2010-12-20b fem started at 181023d05h01m06s269389usUT
The observation of trigger 868427 started 2018-10-23T02:07:43.6
Examining file ./868427_g220_uvot_sky_image.fits
The exposure ID is 561953263
The exposure time is 149.868 (seconds)
The filter is WHITE.
The uvot region is centered at (248.3233,19.5610) with a roll angle of 235.9
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 (248.3290,19.5640) with a radius of 3.000 arc min
This is 0.367 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 (248.3287,19.5706) with a radius of 0.028 arc min
This is 0.651 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 1 of trigger 868427
find_uvot_ag.pl vrs. 2017-02-17 fem started at 181023d05h01m10s017166usUT
Observation start time is 2018-10-23T02:07:43.6
Examining file ./868427_g220_uvot_catalog_image.fits
The exposure ID is 561953263
The exposure is 149.868 sec.
The bin size is 2 pixels
The filter is WHITE
There are 8 detected source(s) for 868427_g220
Aspect correction adds -0.00065 degrees (-0.156 sec of time = -2.21 arc sec) to RA
Aspect correction adds -0.00077 degrees (-2.78 arcsec) to Dec
Total aspect correction is 3.55 arcsec
Star catalogs centered at 248.3234 , 19.5546 with radius 2.61 arc min.
n_usno: 84 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 7 matched entries is 0.289" for 868427_g220
Mean and std. dev of mag. difference (MAG_DELTA) are 0.558 and 0.220 for 868427_g220
Found 1 entries without IDs and 1 entries that are acceptable afterglow candidates for 868427_g220.
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=248.3290 (16:33:18.96) DEC=19.5640 (+19:33:50.4)
XRT distances are from RA=248.3287 (16:33:18.89) DEC=19.5706 (+19:34:14.2)
-----------------
Entry 7 in the list of sources is a candidate afterglow for 868427_g220 with genie
ra=248.33105 (16:33:19.45) dec=19.53001 (+19:31:48.0) +/- 0.7" mag=19.85+/-0.20
dist=146.4 REFID=1 major=1.1 minor=0.7 flag=16 (aperture_incomplete)
*** The position of this source is inconsistent with the XRT position.
The position is 122.6 arc sec from the BAT position.
Found 5 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
248.3316 19.5286 5.5 -1 USNO-B1 20.04 19.21 19.58
248.3343 19.5288 11.9 -1 USNO-B1 20.43 18.81 19.53
248.3322 19.5270 11.4 -1 USNO-B1 17.04 15.91 16.41
248.3319 19.5268 11.9 -1 USNO-B1 18.51 17.48 17.94
248.3311 19.5264 12.8 -1 USNO-B1 19.51 99.99 99.99
*** If XRT position is correct, then this is NOT the afterglow
*** unacceptable flag of 16
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
There are 1.0539366E+05 counts in the bkg source region of 6028.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 17.484 counts/pixel (5-sig UL in 4" is 19.80 mag) for 868427_g220
There are 3500.7363 counts in the xrt source region of 202.00000 pixels.
Rate in xrt region with 8 arcsec radius is 17.330 counts/pixel for 868427_g220
There are 20227.570 counts in the xrt_bkg source region of 1165.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 17.363 counts/pixel (5-sig UL in 4" is 19.80 mag) for 868427_g220
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 20.35, 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: 868427_561953263_181023d05h01m10s017166usUT_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(248.3233,19.5610,45")
fk5;-circle(248.322707449755,19.5679828455155,6")
fk5;-circle(248.336798221607,19.562560941627,6")
fk5;-circle(248.311338183892,19.5623702693181,6")
fk5;-circle(248.309584771195,19.5584169637584,6")
Region file: 868427_561953263_181023d05h01m10s017166usUT_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(248.32871,19.57061,8")
Region file: 868427_561953263_181023d05h01m10s017166usUT_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(248.32871,19.57061,25")
fk5;-circle(248.32871,19.57061,15")
fk5;-circle(248.322707449755,19.5679828455155,6")
image paragraph message for exposure 1 of trigger 868427
------ Start for Possible Stand-alone Circular ----
In response to GRB181023 (Swift/BAT trigger 868427) at 02:04:02 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 199 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 868427 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 181023d05h01m13s111787usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=868427
-expid=561953263 -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/868427/
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 561953263.5938 or about 2018:296:02:07:38 UT
Found 418 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 6% of the srclist region. Found 45 sources in
srclist catalog. Found 2 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 8 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 20.35 mag. Found 80 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 105393.7 counts in the large background region of 6028.0 pixels or a rate
of 17.484 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 19.80 mag. for a
4-arcsec aperture.
Found 3500.7 counts in the XRT position region of 202.0 pixels or a rate of
17.330 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is -0.044 +/- 0.427 (1-sigma) cps. The
3-sigma UL at the XRT position is 1.282 cps or 19.51 mag. The closest srclist
source has ra= 248.3368 dec= 19.5624 mag=18.81 sep=40.30". The closest Genie
source has ra= 248.3227 dec= 19.5680 mag=19.50 sep=22.45".
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?
561953263 199 WHITE srclist found no candidates.
561953263 199 WHITE image found no candidates.
List afterglow candidates for other finding charts.
561953944 880 WHITE srclist found no candidates.
561953944 880 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: 19.57061
GRB_ERROR: 5
GRB_RA: 248.32871
IMAGE_START_TIME: 02:07:38
MAGNITUDE: 19.5
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT