image overlap message for exposure 1 of trigger 859421
uvot_overlap.pl vrs. 2010-12-20b fem started at 180905d18h11m42s123944usUT
The observation of trigger 859421 started 2018-09-05T14:00:42.0
Examining file ./859421_g174_uvot_sky_image.fits
The exposure ID is 557848841
The exposure time is 134.953 (seconds)
The filter is WHITE.
The uvot region is centered at (91.0654,-4.5665) with a roll angle of 81.7
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 (91.0350,-4.5910) with a radius of 3.000 arc min
This is 2.338 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 5.19 sq. arc min or 0.18 of the BAT error circle
The XRT error circle is centered at (91.0627,-4.5702) with a radius of 0.030 arc min
This is 0.273 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 859421
find_uvot_ag.pl vrs. 2017-02-17 fem started at 180905d18h11m44s455323usUT
Observation start time is 2018-09-05T14:00:42.0
Examining file ./859421_g174_uvot_catalog_image.fits
The exposure ID is 557848841
The exposure is 134.953 sec.
The bin size is 2 pixels
The filter is WHITE
There are 15 detected source(s) for 859421_g174
Aspect correction adds 0.00214 degrees (0.514 sec of time = 7.69 arc sec) to RA
Aspect correction adds 0.00111 degrees ( 4.00 arcsec) to Dec
Total aspect correction is 8.67 arcsec
Star catalogs centered at 91.0634 , -4.5692 with radius 2.67 arc min.
n_usno: 105 n_gsc: 0
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 11.98626
RA DEC Mag Color
bright star 0: 91.08553 (06:04:20.53) -4.54649 (-04:32:47.3) 11.99 USNO-V
Mean distance difference (CAT_DELTA) for 12 matched entries is 0.621" for 859421_g174
Mean and std. dev of mag. difference (MAG_DELTA) are 1.096 and 0.664 for 859421_g174
Found 3 entries without IDs and 0 entries that are acceptable afterglow candidates for 859421_g174.
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.
0 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=91.0350 (06:04:08.40) DEC=-4.5910 (-04:35:27.6)
XRT distances are from RA=91.0627 (06:04:15.04) DEC=-4.5702 (-04:34:12.6)
Found NO acceptable entries.
Unidentified entry closest to XRT position is no. 12:
ra= 91.07584 dec= -4.54647 +/- 0.7" mag=19.21+/-0.16 dist=97.5 REFID=2 flag=0
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
91.0648 -4.5684 9.9 -1 USNO-B1 18.55 16.73 17.54
The closest star is 9.92" away.
List UVOT sources within 10" of the XRT position:
Matched source ra=91.06475 (06:04:15.54) dec=-4.56836 (-04:34:06.1) +/- 0.6" mag=18.44+/-0.15 dist=9.9 REFID=10 flag=0
There are 72022.570 counts in the bkg source region of 5638.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 12.774 counts/pixel (5-sig UL in 4" is 19.85 mag) for 859421_g174
There are 2549.0356 counts in the xrt source region of 198.00000 pixels.
Rate in xrt region with 8 arcsec radius is 12.874 counts/pixel for 859421_g174
There are 15130.821 counts in the xrt_bkg source region of 1196.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 12.651 counts/pixel (5-sig UL in 4" is 19.86 mag) for 859421_g174
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 20.41, 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: 859421_557848841_180905d18h11m44s455323usUT_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(91.0654,-4.5665,45")
fk5;-circle(91.0647461304788,-4.56836423863858,6")
fk5;-circle(91.0694033957888,-4.56803665899197,6")
fk5;-circle(91.0700376139219,-4.57460725785338,6")
fk5;-circle(91.0704136238102,-4.56344583990023,6")
fk5;-circle(91.0747062786476,-4.57098519753707,6")
fk5;-circle(91.0732881966091,-4.55930291473146,6")
Region file: 859421_557848841_180905d18h11m44s455323usUT_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(91.06267,-4.57017,8")
Region file: 859421_557848841_180905d18h11m44s455323usUT_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(91.06267,-4.57017,25")
fk5;-circle(91.06267,-4.57017,15")
fk5;-circle(91.0647461304788,-4.56836423863858,6")
fk5;-circle(91.0694033957888,-4.56803665899197,6")
fk5;-circle(91.0700376139219,-4.57460725785338,6")
image paragraph message for exposure 1 of trigger 859421
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 GRB180905 (Swift/BAT trigger 859421) at 13:57:46 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 135 seconds with the White filter
starting 153 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
0.60.
------- notes for trigger 859421 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 180905d18h11m47s053216usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=859421
-expid=557848841 -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/859421/
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 557848841.96236 or about 2018:248:14:00:36 UT
Found 479 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 10% of the srclist region. Found 79 sources in
srclist catalog. Found 5 srclist source(s) without IDs. There are 0 good
candidate(s) in the srclist catalog. Good candidates must be brighter than
19.16 mag.
Found 15 source(s) in Genie image catalog. 1 source(s) are within 10.0" of the
xrt position. Found 3 Genie image source(s) without IDs. There are 0 good
candidate(s) in the Genie image catalog. Good candidates must be brighter than
20.41 mag. Found 101 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 9% of the Genie image region.
Genie image analysis:
Found 72022.6 counts in the large background region of 5638.0 pixels or a rate
of 12.774 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 19.85 mag. for a
4-arcsec aperture.
Found 2549.0 counts in the XRT position region of 198.0 pixels or a rate of
12.874 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 0.326 +/- 0.403 (1-sigma) cps or
21.00 mag and a range from 20.12 to 99.99 mag. The 3-sigma UL at the XRT
position is 1.536 cps or 19.31 mag.
Found 1 srclist source(s) within 10.0" of the XRT position.
The brightest such source has ra= 91.0645 dec= -4.5683 mag=19.09 sep=9.36".
The closest srclist source has ra= 91.0645 dec= -4.5683 mag=19.09 sep=9.36".
Found 1 Genie source(s) within 10.0" of the XRT position. The brightest such
source has ra= 91.0648 dec= -4.5684 mag=18.44 sep=9.89". The closest Genie
source has ra= 91.0648 dec= -4.5684 mag=18.44 sep=9.89".
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 135 seconds with the White filter
starting 153 seconds after the BAT trigger. There is a candidate afterglow in
the rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 06:04:15.54 = 91.06475
DEC(J2000) = -04:34:06.1 = -4.56836
with a 90%-confidence error radius of about 0.63 arc sec. This position is 9.89
arc sec. from the center of the XRT error circle. The estimated magnitude is
18.44 with a 1-sigma error of about 0.15. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.60.
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?
557848841 153 WHITE srclist found no candidates.
557848841 153 WHITE image found no candidates.
List afterglow candidates for other finding charts.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: -4.57017
GRB_ERROR: 5
GRB_RA: 91.06267
IMAGE_START_TIME: 14:00:36
MAGNITUDE: 19.3
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT