image overlap message for exposure 1 of trigger 813771
uvot_overlap.pl vrs. 2010-12-20b fem started at 180312d00h37m08s039165usUT
The observation of trigger 813771 started 2018-03-12T00:32:12.0
Examining file 813771_g1232_uvot_sky_image.fits
The exposure ID is 542507532
The exposure time is 149.868 (seconds)
The filter is WHITE.
The uvot region is centered at (275.0970,7.1882) with a roll angle of 95.1
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 (275.0250,7.1920) with a radius of 3.000 arc min
This is 4.290 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 0.31 sq. arc min or 0.01 of the BAT error circle
The XRT error circle is centered at (275.0895,7.1832) with a radius of 0.088 arc min
This is 0.537 arc min from the center of the uvot region
The area of the XRT error circle is 0.025 sq. arc min
The UVOT/XRT overlap is 0.025 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 1 of trigger 813771
find_uvot_ag.pl vrs. 2017-02-17 fem started at 180312d00h37m08s829846usUT
Observation start time is 2018-03-12T00:32:12.0
Examining file 813771_g1232_uvot_catalog_image.fits
The exposure ID is 542507532
The exposure is 149.868 sec.
The bin size is 2 pixels
The filter is WHITE
There are 31 detected source(s) for 813771_g1232
Aspect correction adds 0.00095 degrees (0.229 sec of time = 3.40 arc sec) to RA
Aspect correction adds -0.00007 degrees (-0.24 arcsec) to Dec
Total aspect correction is 3.41 arcsec
Star catalogs centered at 275.0919 , 7.1893 with radius 2.63 arc min.
n_usno: 416 n_gsc: 520
*** WARNING -- bright star catalog has 2 entries brighter than 12 mag
The brightest has mag 11.20508
RA DEC Mag Color
bright star 0: 275.09094 (18:20:21.83) 7.21634 (+07:12:58.8) 11.21 USNO-V
bright star 1: 275.05371 (18:20:12.89) 7.17657 (+07:10:35.6) 11.84 GSC-V
Mean distance difference (CAT_DELTA) for 33 matched entries is 0.490" for 813771_g1232
Mean and std. dev of mag. difference (MAG_DELTA) are 0.683 and 0.971 for 813771_g1232
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 813771_g1232.
Acceptable entries have no ID, XRT distances < 13.25", 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=275.0250 (18:20:06.00) DEC= 7.1920 (+07:11:31.2)
XRT distances are from RA=275.0895 (18:20:21.48) DEC= 7.1832 (+07:10:59.5)
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
275.0920 7.1827 9.1 -1 USNO-B1 20.32 18.74 19.44
275.0886 7.1818 6.0 -1 USNO-B1 17.31 15.38 16.24
275.0920 7.1826 9.3 -1 GSC2.3 18.58 20.31 99.99
275.0873 7.1833 7.7 -1 GSC2.3 20.22 21.37 99.99
275.0886 7.1818 6.1 -1 GSC2.3 14.99 16.84 15.25
The closest star is 6.01" away.
List UVOT sources within 10" of the XRT position:
Matched source ra=275.08856 (18:20:21.25) dec=7.18186 (+07:10:54.7) +/- 0.6" mag=16.76+/-0.14 dist=5.9 REFID=24 flag=0
Matched source ra=275.09138 (18:20:21.93) dec=7.18524 (+07:11:06.9) +/- 0.6" mag=13.69+/-0.14 dist=10.0 REFID=19 flag=0
There are 66416.195 counts in the bkg source region of 5015.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 13.244 counts/pixel (5-sig UL in 4" is 19.95 mag) for 813771_g1232
There are 4753.6553 counts in the xrt source region of 196.00000 pixels.
Rate in xrt region with 8 arcsec radius is 24.253 counts/pixel for 813771_g1232
There are 14636.035 counts in the xrt_bkg source region of 966.00000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 15.151 counts/pixel (5-sig UL in 4" is 19.87 mag) for 813771_g1232
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 20.50, XRT distances < 13.25",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 813771_542507532_180312d00h37m08s829846usUT_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(275.0970,7.1882,45")
fk5;-circle(275.088558586008,7.18186071785837,6")
fk5;-circle(275.091382810107,7.18524316153673,6")
fk5;-circle(275.095581993641,7.18291703148395,6")
fk5;-circle(275.083571450072,7.18415172662716,6")
fk5;-circle(275.091316733327,7.19026986902963,6")
fk5;-circle(275.095216393303,7.17620242479951,6")
fk5;-circle(275.097703525176,7.18808275703951,6")
fk5;-circle(275.099067730247,7.18050721425496,6")
fk5;-circle(275.100157578903,7.18485195166347,6")
fk5;-circle(275.102781348693,7.1872353873562,6")
fk5;-circle(275.10432441414,7.18583044404541,6")
fk5;-circle(275.093778113792,7.19709081150314,6")
fk5;-circle(275.100423723862,7.19587547744294,6")
fk5;-circle(275.109125519724,7.19456467955709,6")
Region file: 813771_542507532_180312d00h37m08s829846usUT_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(275.0895,+7.1832,8")
Region file: 813771_542507532_180312d00h37m08s829846usUT_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(275.0895,+7.1832,25")
fk5;-circle(275.0895,+7.1832,15")
fk5;-circle(275.091382810107,7.18524316153673,6")
fk5;-circle(275.095581993641,7.18291703148395,6")
fk5;-circle(275.083571450072,7.18415172662716,6")
fk5;-circle(275.085068763823,7.17782550629325,6")
fk5;-circle(275.091316733327,7.19026986902963,6")
image paragraph message for exposure 1 of trigger 813771
THIS MESSAGE IS *NOT* READY FOR DISTRIBUTION.
MORE ANALYSIS IS REQUIRED TO DETERMINE WHETHER THERE IS AN AFTERGLOW CANDIDATE.
IMAGE PROBLEM: high density of stars
SRCLIST PROBLEM: high density of stars, srclist filled telemetry buffer
See notes for more details.
2 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 GRB180312 (Swift/BAT trigger 813771) at 00:11:39 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 1212 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. Because of the density of catalogued stars,
further analysis is required to report an upper limit for any afterglow in the
sub-image. The 8'x8' region for the list of sources generated on-board covers
100% of the XRT error circle. Because of the density of catalogued stars,
further analysis is required to report an upper limit for any afterglow in the
region. No correction has been made for the expected extinction corresponding
to E(B-V) of 0.23.
------- notes for trigger 813771 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 180312d00h37m15s714685usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=813771
-expid=542507532 -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/813771/
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.
*** Warning -- BAT and XRT error circles do NOT overlap.
UVOT exposure began at MET 542507532.02426 or about 2018:071:00:32:07 UT
Found 3090 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 49% of the srclist region. Found 190 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 7 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 31 source(s) in Genie image catalog. 2 source(s) are within 10.0" of the
xrt position. 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
20.50 mag. Found 507 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 50% of the Genie image region.
Genie image analysis:
Found 66416.2 counts in the large background region of 5015.0 pixels or a rate
of 13.244 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 19.95 mag. for a
4-arcsec aperture.
Found 4753.7 counts in the XRT position region of 196.0 pixels or a rate of
24.254 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 11.894 +/- 0.488 (1-sigma) cps or
17.09 mag and a range from 17.05 to 17.14 mag. The 3-sigma UL at the XRT
position is 13.358 cps or 16.97 mag. The number of srclist sources filled the
available telemetry. The weakest source detected was 18.98 mag.
Found 2 srclist source(s) within 10.0" of the XRT position.
The brightest such source has ra= 275.0886 dec= 7.1819 mag=17.65 sep=5.69".
The closest srclist source has ra= 275.0886 dec= 7.1819 mag=17.65 sep=5.69".
Found 2 Genie source(s) within 10.0" of the XRT position. The brightest such
source has ra= 275.0886 dec= 7.1819 mag=16.76 sep=5.88". The closest Genie
source has ra= 275.0886 dec= 7.1819 mag=16.76 sep=5.88".
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 1212 seconds after the BAT trigger. There is a candidate afterglow in
the rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 18:20:21.25 = 275.08856
DEC(J2000) = +07:10:54.7 = 7.18186
with a 90%-confidence error radius of about 0.61 arc sec. This position is 5.88
arc sec. from the center of the XRT error circle. The estimated magnitude is
16.76 with a 1-sigma error of about 0.14. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.23.
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?
542507532 1212 WHITE srclist found no candidates.
542507532 1212 WHITE image found no candidates.
List afterglow candidates for other finding charts.
------- Tokens for Quick GCN -------