image overlap message for exposure 3 of trigger 863421
uvot_overlap.pl vrs. 2010-12-20b fem started at 180925d22h21m36s186625usUT
The observation of trigger 863421 started 2018-09-25T14:52:10.3
Examining file ./863421_g878_uvot_sky_image.fits
The exposure ID is 559579930
The exposure time is 149.868 (seconds)
The filter is WHITE.
*** Warning -- found 7899 null pixels in the image.
The uvot region is centered at (315.2002,-64.4606) with a roll angle of 229.6
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 (315.2130,-64.4430) with a radius of 3.000 arc min
This is 1.108 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 (315.2008,-64.4569) with a radius of 0.063 arc min
This is 0.225 arc min from the center of the uvot region
The area of the XRT error circle is 0.013 sq. arc min
The UVOT/XRT overlap is 0.013 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 3 of trigger 863421
find_uvot_ag.pl vrs. 2017-02-17 fem started at 180925d22h22m01s785583usUT
Observation start time is 2018-09-25T14:52:10.3
Examining file ./863421_g878_uvot_catalog_image.fits
The exposure ID is 559579930
The exposure is 149.868 sec.
The bin size is 2 pixels
The filter is WHITE
There are 10 detected source(s) for 863421_g878
Aspect correction adds -0.00158 degrees (-0.379 sec of time = -2.45 arc sec) to RA
Aspect correction adds 0.00032 degrees ( 1.17 arcsec) to Dec
Total aspect correction is 2.72 arcsec
Star catalogs centered at 315.2077 , -64.4572 with radius 2.20 arc min.
n_usno: 54 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 12 matched entries is 0.744" for 863421_g878
Mean and std. dev of mag. difference (MAG_DELTA) are 0.684 and 1.320 for 863421_g878
Found 1 entries without IDs and 1 entries that are acceptable afterglow candidates for 863421_g878.
Acceptable entries have no ID, XRT distances < 9.5", 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=315.2130 (21:00:51.12) DEC=-64.4430 (-64:26:34.8)
XRT distances are from RA=315.2008 (21:00:48.18) DEC=-64.4569 (-64:27:24.8)
-----------------
Entry 0 in the list of sources is a candidate afterglow for 863421_g878 with genie
ra=315.20199 (21:00:48.48) dec=-64.45701 (-64:27:25.2) +/- 0.7" mag=19.56+/-0.16
dist=2.0 REFID=3 major=3.5 minor=2.7 flag=0
Found 6 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
315.2065 -64.4596 11.6 -1 USNO-B1 18.10 18.63 18.39
315.2100 -64.4598 16.0 -1 USNO-B1 18.65 18.13 18.36
315.2113 -64.4599 17.9 -1 USNO-B1 19.03 18.23 18.59
315.1954 -64.4591 12.8 -1 USNO-B1 14.20 19.62 17.21
315.1938 -64.4580 13.2 -1 USNO-B1 19.75 13.22 16.12
315.1940 -64.4593 14.9 -1 USNO-B1 14.20 12.75 13.39
*** unacceptable major profile of 3.5
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=315.20199 (21:00:48.48) dec=-64.45701 (-64:27:25.2) +/- 0.7" mag=19.56+/-0.16 dist=2.0 REFID=3 flag=0
There are 37682.168 counts in the bkg source region of 4824.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 7.811 counts/pixel (5-sig UL in 4" is 20.23 mag) for 863421_g878
There are 2040.6278 counts in the xrt source region of 198.00000 pixels.
Rate in xrt region with 8 arcsec radius is 10.306 counts/pixel for 863421_g878
There are 7509.2114 counts in the xrt_bkg source region of 904.00000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 8.307 counts/pixel (5-sig UL in 4" is 20.20 mag) for 863421_g878
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 20.79, XRT distances < 9.5",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 863421_559579930_180925d22h22m01s785583usUT_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(315.2002,-64.4606,45")
fk5;-circle(315.201994625525,-64.4570067113649,6")
fk5;-circle(315.206480655223,-64.4594953618327,6")
fk5;-circle(315.211330606678,-64.45987844976,6")
fk5;-circle(315.194410480229,-64.4594871484724,6")
fk5;-circle(315.210523163622,-64.4639350255756,6")
fk5;-circle(315.215100933723,-64.4642132227142,6")
fk5;-circle(315.198187104261,-64.4652763166856,6")
fk5;-circle(315.198465444628,-64.470959540512,6")
Region file: 863421_559579930_180925d22h22m01s785583usUT_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(315.20075,-64.45689,8")
Region file: 863421_559579930_180925d22h22m01s785583usUT_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(315.20075,-64.45689,25")
fk5;-circle(315.20075,-64.45689,15")
fk5;-circle(315.206480655223,-64.4594953618327,6")
fk5;-circle(315.211330606678,-64.45987844976,6")
fk5;-circle(315.194410480229,-64.4594871484724,6")
fk5;-circle(315.210523163622,-64.4639350255756,6")
fk5;-circle(315.198187104261,-64.4652763166856,6")
image paragraph message for exposure 3 of trigger 863421
SRCLIST PROBLEM: srclist filled telemetry buffer
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 GRB180925 (Swift/BAT trigger 863421) at 14:37:31 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 856 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 coverage of the XRT error circle by the 8'x8' region for the list of
sources generated on-board is uncertain because the large number of sources
filled the available telemetry. 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 0.03.
------- notes for trigger 863421 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 180925d22h22m04s839823usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=863421
-expid=559579930 -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/863421/
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 559579930.27666 or about 2018:268:14:52:05 UT
Found 1130 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 9% of the srclist region. Found 186 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 52 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 10 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
20.79 mag. Found 50 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 7% of the Genie image region. The
Genie image is INCOMPLETE with 7899 null pixels.
Genie image analysis:
Found 37682.2 counts in the large background region of 4824.0 pixels or a rate
of 7.811 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 20.23 mag. for a
4-arcsec aperture.
Found 2040.6 counts in the XRT position region of 198.0 pixels or a rate of
10.306 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 2.639 +/- 0.327 (1-sigma) cps or
18.73 mag and a range from 18.60 to 18.87 mag. The 3-sigma UL at the XRT
position is 3.619 cps or 18.38 mag. The number of srclist sources filled the
available telemetry. The weakest source detected was 19.65 mag. The closest
srclist source has ra= 315.2061 dec= -64.4595 mag=19.51 sep=12.52".
Found 1 Genie source(s) within 10.0" of the XRT position. The brightest such
source has ra= 315.2020 dec= -64.4570 mag=19.56 sep=1.98". The closest Genie
source has ra= 315.2020 dec= -64.4570 mag=19.56 sep=1.98".
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 856 seconds after the BAT trigger. There is a candidate afterglow in
the rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 21:00:48.48 = 315.20199
DEC(J2000) = -64:27:25.2 = -64.45701
with a 90%-confidence error radius of about 0.66 arc sec. This position is 1.98
arc sec. from the center of the XRT error circle. The estimated magnitude is
19.56 with a 1-sigma error of about 0.16. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.03.
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?
559579930 856 WHITE srclist found no candidates.
559579930 856 WHITE image found no candidates.
List afterglow candidates for other finding charts.
559579192 118 WHITE srclist found no candidates.
559579192 118 WHITE image found no candidates.
559579349 275 U srclist found no candidates.
559579349 275 U image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: -64.45689
GRB_ERROR: 9.5
GRB_RA: 315.20075
IMAGE_START_TIME: 14:52:05
MAGNITUDE: 18.4
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT