image overlap message for exposure 1 of trigger 834937
uvot_overlap.pl vrs. 2010-12-20b fem started at 180531d04h34m16s360961usUT
The observation of trigger 834937 started 2018-05-31T04:04:41.2
Examining file ./834937_g150_uvot_sky_image.fits
The exposure ID is 549432281
The exposure time is 149.868 (seconds)
The filter is WHITE.
The uvot region is centered at (210.5006,11.9891) with a roll angle of 312.5
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 (210.5080,11.9850) with a radius of 3.000 arc min
This is 0.498 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 (210.4947,12.0151) with a radius of 0.052 arc min
This is 1.598 arc min from the center of the uvot region
The area of the XRT error circle is 0.008 sq. arc min
The UVOT/XRT overlap is 0.000 sq. arc min or 0.00 of the XRT error circle
image afterglow message for exposure 1 of trigger 834937
find_uvot_ag.pl vrs. 2017-02-17 fem started at 180531d04h34m19s170995usUT
Observation start time is 2018-05-31T04:04:41.2
Examining file ./834937_g150_uvot_catalog_image.fits
The exposure ID is 549432281
The exposure is 149.868 sec.
The bin size is 2 pixels
The filter is WHITE
There are 4 detected source(s) for 834937_g150
Aspect correction adds -0.00067 degrees (-0.160 sec of time = -2.35 arc sec) to RA
Aspect correction adds 0.00043 degrees ( 1.56 arcsec) to Dec
Total aspect correction is 2.82 arcsec
Star catalogs centered at 210.4952 , 11.9885 with radius 2.41 arc min.
n_usno: 63 n_gsc: 60
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 4 matched entries is 0.617" for 834937_g150
Mean and std. dev of mag. difference (MAG_DELTA) are 1.439 and 0.699 for 834937_g150
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 834937_g150.
Acceptable entries have no ID, XRT distances < 7.75", 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=210.5080 (14:02:01.92) DEC=11.9850 (+11:59:06.0)
XRT distances are from RA=210.4947 (14:01:58.72) DEC=12.0151 (+12:00:54.3)
Found 5 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
210.4947 12.0140 3.9 -1 USNO-B1 19.78 19.30 19.51
210.4946 12.0143 2.7 -1 USNO-B1 19.53 18.56 18.99
210.4939 12.0155 3.1 -1 USNO-B1 18.23 17.86 18.02
210.4950 12.0140 4.1 -1 GSC2.3 19.00 20.13 19.09
210.4940 12.0155 2.7 -1 GSC2.3 17.81 18.32 18.38
The closest star is 2.68" away.
List UVOT sources within 10" of the XRT position:
There are 48902.871 counts in the bkg source region of 6304.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 7.757 counts/pixel (5-sig UL in 4" is 20.24 mag) for 834937_g150
Do not compute counts in XRT region because position is too far from center.
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 < 7.75",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 834937_549432281_180531d04h34m19s170995usUT_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(210.5006,11.9891,45")
image paragraph message for exposure 1 of trigger 834937
IMAGE PROBLEM: no overlap
------ Start for Possible Stand-alone Circular ----
In response to GRB180531 (Swift/BAT trigger 834937) at 04:02:10 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 129 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 none of
the XRT error circle. 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 834937 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 180531d04h34m21s424659usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=834937
-expid=549432281 -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/834937/
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 549432281.16928 or about 2018:151:04:04:36 UT
Found 312 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 6% of the srclist region. Found 26 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
19.22 mag.
Found 4 source(s) in Genie image catalog. Found 0 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 60 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 7% of the
Genie image region.
Genie image analysis:
Found 48902.9 counts in the large background region of 6304.0 pixels or a rate
of 7.757 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 20.24 mag. for a
4-arcsec aperture.
Found 1 srclist source(s) within 10.0" of the XRT position.
The brightest such source has ra= 210.4939 dec= 12.0156 mag=18.52 sep=3.34".
The closest srclist source has ra= 210.4939 dec= 12.0156 mag=18.52 sep=3.34".
The closest Genie source has ra= 210.5034 dec= 12.0097 mag=18.69 sep=36.47".
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 129 seconds after the BAT trigger. There is a candidate afterglow in
the list of sources generated on-board at
RA(J2000) = 14:01:58.54 = 210.49390
DEC(J2000) = +12:00:56.2 = 12.01562
with a 90%-confidence error radius of about 1.10 arc sec. This position is 3.34
arc sec. from the center of the XRT error circle. The estimated magnitude is
18.52 with a 1-sigma error of about 0.35. 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?
549432281 129 WHITE srclist found no candidates.
549432281 129 WHITE image found no candidates.
List afterglow candidates for other finding charts.
549432439 287 U srclist found no candidates.
549432439 287 U image found no candidates.
549433018 866 WHITE srclist found no candidates.
549433018 866 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: SRCLIST
FILTER: white
GRB_DEC: 12.01508
GRB_ERROR: 7.75
GRB_RA: 210.49467
IMAGE_START_TIME: 04:04:36
MAGNITUDE: 18.0
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT