image overlap message for exposure 2 of trigger 843122
uvot_overlap.pl vrs. 2010-12-20b fem started at 180620d10h44m55s615150usUT
The observation of trigger 843122 started 2018-06-20T08:49:51.5
Examining file ./843122_g892_uvot_sky_image.fits
The exposure ID is 551177391
The exposure time is 149.857 (seconds)
The filter is WHITE.
The uvot region is centered at (279.8837,23.2698) with a roll angle of 13.6
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 (279.8830,23.2650) with a radius of 3.000 arc min
This is 0.292 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 (279.8965,23.2442) with a radius of 0.030 arc min
This is 1.692 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 0.000 sq. arc min or 0.00 of the XRT error circle
image afterglow message for exposure 2 of trigger 843122
find_uvot_ag.pl vrs. 2017-02-17 fem started at 180620d10h45m10s194453usUT
Observation start time is 2018-06-20T08:49:51.5
Examining file ./843122_g892_uvot_catalog_image.fits
The exposure ID is 551177391
The exposure is 149.857 sec.
The bin size is 2 pixels
The filter is WHITE
There are 35 detected source(s) for 843122_g892
Aspect correction adds 0.00019 degrees (0.045 sec of time = 0.62 arc sec) to RA
Aspect correction adds 0.00041 degrees ( 1.47 arcsec) to Dec
Total aspect correction is 1.60 arcsec
Star catalogs centered at 279.8827 , 23.2681 with radius 2.49 arc min.
n_usno: 252 n_gsc: 261
*** WARNING -- bright star catalog has 2 entries brighter than 12 mag
The brightest has mag 11.04936
RA DEC Mag Color
bright star 0: 279.86621 (18:39:27.89) 23.27623 (+23:16:34.4) 11.05 USNO-V
bright star 1: 279.91078 (18:39:38.59) 23.24268 (+23:14:33.6) 11.71 USNO-V
Mean distance difference (CAT_DELTA) for 32 matched entries is 0.322" for 843122_g892
Mean and std. dev of mag. difference (MAG_DELTA) are 0.827 and 0.524 for 843122_g892
Found 3 entries without IDs and 0 entries that are acceptable afterglow candidates for 843122_g892.
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.
3 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=279.8830 (18:39:31.92) DEC=23.2650 (+23:15:54.0)
XRT distances are from RA=279.8965 (18:39:35.15) DEC=23.2442 (+23:14:39.0)
Found NO acceptable entries.
Unidentified entry closest to XRT position is no. 10:
ra=279.87042 dec= 23.27389 +/- 0.6" mag=15.63+/-0.14 dist=137.3 REFID=9 flag=3
Found 2 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
279.8989 23.2436 8.2 -1 USNO-B1 19.27 18.34 18.75
279.8989 23.2436 8.4 -1 GSC2.3 18.22 19.29 18.25
The closest star is 8.20" away.
List UVOT sources within 10" of the XRT position:
There are 45186.008 counts in the bkg source region of 5395.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 8.376 counts/pixel (5-sig UL in 4" is 20.20 mag) for 843122_g892
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 20.75, 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: 843122_551177391_180620d10h45m10s194453usUT_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(279.8837,23.2698,45")
fk5;-circle(279.882154782467,23.269712551655,6")
fk5;-circle(279.886670799908,23.2694183551103,6")
fk5;-circle(279.888254664353,23.2620098536662,6")
fk5;-circle(279.875754516269,23.2591017677045,6")
fk5;-circle(279.886029302003,23.2756251703339,6")
fk5;-circle(279.892814260016,23.272069128199,6")
fk5;-circle(279.870101984135,23.267388297748,6")
fk5;-circle(279.892292590955,23.2744759361182,6")
fk5;-circle(279.896820937287,23.268974470777,6")
fk5;-circle(279.870418305283,23.2738880096818,6")
fk5;-circle(279.884068565203,23.2819036906898,6")
image paragraph message for exposure 2 of trigger 843122
THIS MESSAGE IS *NOT* READY FOR DISTRIBUTION.
MORE ANALYSIS IS REQUIRED TO DETERMINE WHETHER THERE IS AN AFTERGLOW CANDIDATE.
IMAGE PROBLEM: no overlap
SRCLIST PROBLEM: srclist filled telemetry buffer
See notes for more details.
------ Start for Possible Stand-alone Circular ----
In response to GRB180620 (Swift/BAT trigger 843122) at 08:34:58 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 872 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 0.00% of the XRT error circle. No correction has been made for
the expected extinction corresponding to E(B-V) of 0.13.
------- notes for trigger 843122 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 180620d10h45m13s071796usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=843122
-expid=551177391 -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/843122/
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 551177391.54348 or about 2018:171:08:49:46 UT
Found 2625 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 29% of the srclist region. Found 190 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 11 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 35 source(s) in Genie image catalog. 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 20.75 mag. Found 253 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
28% of the Genie image region.
Genie image analysis:
Found 45186.0 counts in the large background region of 5395.0 pixels or a rate
of 8.376 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 20.20 mag. for a
4-arcsec aperture. The number of srclist sources filled the available
telemetry. The weakest source detected was 19.09 mag. The closest srclist
source has ra= 279.8756 dec= 23.2589 mag=18.18 sep=87.13". The closest Genie
source has ra= 279.8999 dec= 23.2531 mag=19.98 sep=33.98".
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?
551177391 871 WHITE srclist found no candidates.
551177391 871 WHITE image found no candidates.
List afterglow candidates for other finding charts.
551176789 269 WHITE 279.89618 23.24437 18.24/19.2 1.2 srclist Yes
551176789 269 WHITE image found no candidates.
------- Tokens for Quick GCN -------