image overlap message for exposure 1 of trigger 846395
uvot_overlap.pl vrs. 2010-12-20b fem started at 180706d14h48m41s670149usUT
The observation of trigger 846395 started 2018-07-06T08:26:36.6
Examining file ./846395_g115_uvot_sky_image.fits
The exposure ID is 552558396
The exposure time is 149.868 (seconds)
The filter is WHITE.
The uvot region is centered at (181.6358,66.0345) with a roll angle of 267.2
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 (181.6650,66.0350) with a radius of 3.000 arc min
This is 0.713 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 (181.6426,66.0371) with a radius of 0.028 arc min
This is 0.228 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 846395
find_uvot_ag.pl vrs. 2017-02-17 fem started at 180706d14h48m44s682273usUT
Observation start time is 2018-07-06T08:26:36.6
Examining file ./846395_g115_uvot_catalog_image.fits
The exposure ID is 552558396
The exposure is 149.868 sec.
The bin size is 2 pixels
The filter is WHITE
There are 2 detected source(s) for 846395_g115
Aspect correction adds -0.00001 degrees (-0.003 sec of time = -0.02 arc sec) to RA
Aspect correction adds 0.00086 degrees ( 3.10 arcsec) to Dec
Total aspect correction is 3.10 arcsec
Star catalogs centered at 181.6560 , 66.0333 with radius 2.40 arc min.
n_usno: 58 n_gsc: 51
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 1 matched entries is 0.537" for 846395_g115
Mean and std. dev of mag. difference (MAG_DELTA) are 1.954 and 0.000 for 846395_g115
Found 1 entries without IDs and 1 entries that are acceptable afterglow candidates for 846395_g115.
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=181.6650 (12:06:39.60) DEC=66.0350 (+66:02:06.0)
XRT distances are from RA=181.6426 (12:06:34.22) DEC=66.0371 (+66:02:13.7)
*** WARNING 50 per cent of entries have no IDs.
-----------------
Entry 0 in the list of sources is a candidate afterglow for 846395_g115 with genie
ra=181.64235 (12:06:34.16) dec=66.03698 (+66:02:13.1) +/- 1.0" mag=20.22+/-0.27
dist=0.7 REFID=1 major=1.4 minor=1.1 flag=0
Found 1 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
181.6397 66.0418 17.7 -1 USNO-B1 20.47 19.69 20.04
uvot_check_outside found 12 of 12 good pixels
##### This source remains a candidate #####
It has no entries within 3.5" or brighter than 12 mag
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
Unmatched source ra=181.64235 (12:06:34.16) dec=66.03698 (+66:02:13.1) +/- 1.0" mag=20.22+/-0.27 dist=0.7 REFID=1 flag=0
There are 1.7672722E+05 counts in the bkg source region of 6194.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 28.532 counts/pixel (5-sig UL in 4" is 19.53 mag) for 846395_g115
There are 5935.6709 counts in the xrt source region of 202.00000 pixels.
Rate in xrt region with 8 arcsec radius is 29.385 counts/pixel for 846395_g115
There are 35851.363 counts in the xrt_bkg source region of 1249.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 28.704 counts/pixel (5-sig UL in 4" is 19.53 mag) for 846395_g115
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 20.09, 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: 846395_552558396_180706d14h48m44s682273usUT_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(181.6358,66.0345,45")
fk5;-circle(181.642350430909,66.0369789861067,6")
Region file: 846395_552558396_180706d14h48m44s682273usUT_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(181.64258,66.03714,8")
Region file: 846395_552558396_180706d14h48m44s682273usUT_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(181.64258,66.03714,25")
fk5;-circle(181.64258,66.03714,15")
image paragraph message for exposure 1 of trigger 846395
1 source(s) near the XRT position were rejected as afterglow candidate(s). See
notes for details.
------ Start for Possible Stand-alone Circular ----
In response to GRB180706 (Swift/BAT trigger 846395) at 08:24:40 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 94 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
0.02.
------- notes for trigger 846395 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 180706d14h48m50s097044usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=846395
-expid=552558396 -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/846395/
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 552558396.57772 or about 2018:187:08:26:31 UT
Found 264 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 5% of the srclist region. Found 10 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 2 source(s) in Genie image catalog. 1 source(s) are within 10.0" of the
xrt position. 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
20.09 mag. Found 54 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 6% of the Genie image region.
Genie image analysis:
Found 176727.2 counts in the large background region of 6194.0 pixels or a rate
of 28.532 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 19.53 mag. for a
4-arcsec aperture.
Found 5935.7 counts in the XRT position region of 202.0 pixels or a rate of
29.385 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 0.917 +/- 0.553 (1-sigma) cps or
19.87 mag and a range from 19.36 to 20.88 mag. The 3-sigma UL at the XRT
position is 2.575 cps or 18.75 mag. The closest srclist source has ra= 181.7069
dec= 66.0443 mag=16.43 sep=97.46".
Found 1 Genie source(s) within 10.0" of the XRT position. The brightest such
source has ra= 181.6423 dec= 66.0370 mag=20.22 sep=0.67". The closest Genie
source has ra= 181.6423 dec= 66.0370 mag=20.22 sep=0.67".
Report rejected UVOT sources within 10 arcsec XRT position.
Such sources are usually NOT the afterglow.
****THIS SOURCE NEAR XRT POSITION WAS REJECTED--USE WITH CAUTION****
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 94 seconds after the BAT trigger. There is a candidate afterglow in
the rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 12:06:34.16 = 181.64235
DEC(J2000) = +66:02:13.1 = 66.03698
with a 90%-confidence error radius of about 1.03 arc sec. This position is 0.67
arc sec. from the center of the XRT error circle. The estimated magnitude is
20.22 with a 1-sigma error of about 0.27. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.02.
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?
552558396 94 WHITE srclist found no candidates.
552558396 94 WHITE 181.64235 66.03698 20.22/20.1 0.7 image Yes
List afterglow candidates for other finding charts.
552558608 306 U 181.64276 66.03704 18.01/18.1 1.7 srclist Yes
552558608 306 U 181.64308 66.03712 17.74/19.8 2.0 image Yes
552559162 860 WHITE 181.64286 66.03719 18.68/19.2 2.3 srclist Yes
552559162 860 WHITE 181.64278 66.03719 18.49/20.2 2.3 image Yes
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: 66.03714
GRB_ERROR: 5
GRB_RA: 181.64258
IMAGE_START_TIME: 08:26:31
MAGNITUDE: 18.8
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT