image overlap message for exposure 2 of trigger 815603
uvot_overlap.pl vrs. 2010-12-20b fem started at 180319d01h35m31s646924usUT
The observation of trigger 815603 started 2018-03-19T01:17:32.2
Examining file 815603_g320_uvot_sky_image.fits
The exposure ID is 543115052
The exposure time is 249.924 (seconds)
The filter is U.
The uvot region is centered at (275.0951,7.1851) with a roll angle of 91.5
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 (275.0940,7.1690) with a radius of 3.000 arc min
This is 0.968 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 (275.0915,7.1839) with a radius of 0.090 arc min
This is 0.224 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 2 of trigger 815603
find_uvot_ag.pl vrs. 2017-02-17 fem started at 180319d01h35m32s511057usUT
Observation start time is 2018-03-19T01:17:32.2
Examining file 815603_g320_uvot_catalog_image.fits
The exposure ID is 543115052
The exposure is 249.924 sec.
The bin size is 2 pixels
The filter is U
There are 24 detected source(s) for 815603_g320
Aspect correction adds -0.00016 degrees (-0.038 sec of time = -0.57 arc sec) to RA
Aspect correction adds -0.00032 degrees (-1.16 arcsec) to Dec
Total aspect correction is 1.29 arcsec
Star catalogs centered at 275.0948 , 7.1834 with radius 2.42 arc min.
n_usno: 344 n_gsc: 436
*** WARNING -- bright star catalog has 1 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
Mean distance difference (CAT_DELTA) for 25 matched entries is 0.527" for 815603_g320
Mean and std. dev of mag. difference (MAG_DELTA) are 1.133 and 1.577 for 815603_g320
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 815603_g320.
Acceptable entries have no ID, XRT distances < 13.5", 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=275.0940 (18:20:22.56) DEC= 7.1690 (+07:10:08.4)
XRT distances are from RA=275.0915 (18:20:21.96) DEC= 7.1839 (+07:11:02.0)
Found 6 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
275.0937 7.1833 8.3 -1 USNO-B1 19.88 18.17 18.93
275.0920 7.1827 4.6 -1 USNO-B1 20.32 18.74 19.44
275.0914 7.1854 5.3 -1 USNO-B1 18.30 17.54 17.87
275.0938 7.1832 8.6 -1 GSC2.3 18.15 19.43 18.79
275.0920 7.1826 5.1 -1 GSC2.3 18.58 20.31 99.99
275.0915 7.1853 4.9 -1 GSC2.3 18.05 18.87 17.17
The closest star is 4.63" away.
List UVOT sources within 10" of the XRT position:
Matched source ra=275.09145 (18:20:21.95) dec=7.18525 (+07:11:06.9) +/- 0.6" mag=11.77+/-0.14 dist=4.9 REFID=10 flag=3
There are 31007.391 counts in the bkg source region of 5475.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 5.663 counts/pixel (5-sig UL in 4" is 19.52 mag) for 815603_g320
There are 22826.455 counts in the xrt source region of 199.00000 pixels.
Rate in xrt region with 8 arcsec radius is 114.706 counts/pixel for 815603_g320
There are 7962.5962 counts in the xrt_bkg source region of 1055.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 7.547 counts/pixel (5-sig UL in 4" is 19.37 mag) for 815603_g320
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 20.08, XRT distances < 13.5",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 815603_543115052_180319d01h35m32s511057usUT_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(275.0951,7.1851,45")
fk5;-circle(275.091449739687,7.1852481959007,6")
fk5;-circle(275.095326218892,7.18297875537596,6")
fk5;-circle(275.091310263368,7.19014626745483,6")
fk5;-circle(275.097547573269,7.18811855811651,6")
fk5;-circle(275.099015799343,7.18040884083707,6")
fk5;-circle(275.083628051933,7.18412332006798,6")
fk5;-circle(275.102686289052,7.1779862594014,6")
fk5;-circle(275.100449711668,7.19579874307262,6")
Region file: 815603_543115052_180319d01h35m32s511057usUT_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(275.0915,+7.1839,8")
Region file: 815603_543115052_180319d01h35m32s511057usUT_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(275.0915,+7.1839,25")
fk5;-circle(275.0915,+7.1839,15")
fk5;-circle(275.095326218892,7.18297875537596,6")
fk5;-circle(275.091310263368,7.19014626745483,6")
fk5;-circle(275.097547573269,7.18811855811651,6")
fk5;-circle(275.099015799343,7.18040884083707,6")
fk5;-circle(275.083628051933,7.18412332006798,6")
image paragraph message for exposure 2 of trigger 815603
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 GRB180319 (Swift/BAT trigger 815603) at 01:12:11 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
300 seconds after the BAT trigger. There is a candidate afterglow in the list
of sources generated on-board at
RA(J2000) = 18:20:22.10 = 275.09209
DEC(J2000) = +07:11:13.9 = 7.18720
with a 90%-confidence error radius of about 1.10 arc sec. This position is 12.1
arc sec. from the center of the XRT error circle. The estimated magnitude is
18.12. No correction has been made for the expected extinction corresponding to
E(B-V) of 0.23.
------- notes for trigger 815603 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 180319d01h35m34s211380usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=815603
-expid=543115052 -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/815603/
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 543115052.2189 or about 2018:078:01:17:27 UT
Found 2842 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 29 srclist
source(s) without IDs. There are 1 good candidate(s) in the srclist catalog.
Good candidates must be brighter than 18.12 mag.
Found 24 source(s) in Genie image catalog. 1 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
20.08 mag. Found 430 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 50% of the Genie image region.
Found 1 Genie source(s) within 10.0" of the XRT position. The brightest such
source has ra= 275.0915 dec= 7.1852 mag=11.77 sep=4.86". The closest Genie
source has ra= 275.0915 dec= 7.1852 mag=11.77 sep=4.86".
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 250 seconds with the U filter starting
300 seconds after the BAT trigger. There is a candidate afterglow in the
rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 18:20:21.95 = 275.09145
DEC(J2000) = +07:11:06.9 = 7.18525
with a 90%-confidence error radius of about 0.61 arc sec. This position is 4.86
arc sec. from the center of the XRT error circle. The estimated magnitude is
11.77 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?
543115052 300 U 275.09209 7.18720 18.12/18.1 12.1 srclist Yes
543115052 300 U 275.09031 7.18398 18.52/18.1 4.3 srclist Yes
543115052 300 U image found no candidates.
List afterglow candidates for other finding charts.
543114840 88 WHITE srclist found no candidates.
543114840 88 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: SRCLIST
FILTER: u
GRB_DEC: 7.18720
GRB_ERROR: 1.10
GRB_RA: 275.09209
IMAGE_START_TIME: 01:17:27
MAGNITUDE: 18.12
MAG_ERROR: 0.4
MESSAGE_TYPE: ACK
SOURCE: XRT