image overlap message for exposure 1 of trigger 830822
uvot_overlap.pl vrs. 2010-12-20b fem started at 180504d20h08m01s259206usUT
The observation of trigger 830822 started 2018-05-04T19:48:31.9
Examining file ./830822_g137_uvot_sky_image.fits
The exposure ID is 547156111
The exposure time is 149.658 (seconds)
The filter is WHITE.
The uvot region is centered at (331.1461,-14.6580) with a roll angle of 69.0
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 (331.1340,-14.6550) with a radius of 3.000 arc min
This is 0.722 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 (331.1442,-14.6584) with a radius of 0.035 arc min
This is 0.111 arc min from the center of the uvot region
The area of the XRT error circle is 0.004 sq. arc min
The UVOT/XRT overlap is 0.004 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 1 of trigger 830822
find_uvot_ag.pl vrs. 2017-02-17 fem started at 180504d20h08m09s571294usUT
Observation start time is 2018-05-04T19:48:31.9
Examining file ./830822_g137_uvot_catalog_image.fits
The exposure ID is 547156111
The exposure is 149.658 sec.
The bin size is 2 pixels
The filter is WHITE
There are 5 detected source(s) for 830822_g137
Aspect correction adds 0.00216 degrees (0.517 sec of time = 7.51 arc sec) to RA
Aspect correction adds 0.00159 degrees ( 5.73 arcsec) to Dec
Total aspect correction is 9.45 arcsec
Star catalogs centered at 331.1458 , -14.6589 with radius 2.34 arc min.
n_usno: 38 n_gsc: 39
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 11.6492
RA DEC Mag Color
bright star 0: 331.14114 (22:04:33.87) -14.68882 (-14:41:19.8) 11.65 USNO-V
Mean distance difference (CAT_DELTA) for 5 matched entries is 1.092" for 830822_g137
Mean and std. dev of mag. difference (MAG_DELTA) are 1.100 and 0.382 for 830822_g137
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 830822_g137.
Acceptable entries have no ID, XRT distances < 5.25", 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=331.1340 (22:04:32.16) DEC=-14.6550 (-14:39:18.0)
XRT distances are from RA=331.1442 (22:04:34.61) DEC=-14.6584 (-14:39:30.4)
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
331.1461 -14.6586 6.5 -1 USNO-B1 21.01 20.06 20.48
331.1459 -14.6586 6.0 -1 GSC2.3 20.37 99.99 99.99
The closest star is 6.04" away.
List UVOT sources within 10" of the XRT position:
There are 1.0919116E+05 counts in the bkg source region of 6119.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 17.845 counts/pixel (5-sig UL in 4" is 19.78 mag) for 830822_g137
There are 3585.3254 counts in the xrt source region of 199.00000 pixels.
Rate in xrt region with 8 arcsec radius is 18.017 counts/pixel for 830822_g137
There are 22232.326 counts in the xrt_bkg source region of 1247.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 17.829 counts/pixel (5-sig UL in 4" is 19.78 mag) for 830822_g137
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 20.34, XRT distances < 5.25",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 830822_547156111_180504d20h08m09s571294usUT_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(331.1461,-14.6580,45")
fk5;-circle(331.13617997726,-14.6641070264657,6")
fk5;-circle(331.156855538375,-14.6535652164974,6")
Region file: 830822_547156111_180504d20h08m09s571294usUT_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(331.14421,-14.65844,8")
Region file: 830822_547156111_180504d20h08m09s571294usUT_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(331.14421,-14.65844,25")
fk5;-circle(331.14421,-14.65844,15")
image paragraph message for exposure 1 of trigger 830822
------ Start for Possible Stand-alone Circular ----
In response to GRB180504 (Swift/BAT trigger 830822) at 19:46:13 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 117 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
0.04.
------- notes for trigger 830822 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 180504d20h08m13s511601usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=830822
-expid=547156111 -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/830822/
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 547156111.86782 or about 2018:124:19:48:26 UT
Found 265 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 4% of the srclist region. Found 26 sources in
srclist catalog. Found 1 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 5 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 20.34 mag. Found 39 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 4% of the
Genie image region.
Genie image analysis:
Found 109191.2 counts in the large background region of 6119.0 pixels or a rate
of 17.845 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 19.79 mag. for a
4-arcsec aperture.
Found 3585.3 counts in the XRT position region of 199.0 pixels or a rate of
18.017 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 0.249 +/- 0.430 (1-sigma) cps or
21.29 mag and a range from 20.20 to 99.99 mag. The 3-sigma UL at the XRT
position is 1.538 cps or 19.31 mag. The closest srclist source has ra= 331.1361
dec= -14.6644 mag=17.99 sep=35.44". The closest Genie source has ra= 331.1362
dec= -14.6641 mag=17.52 sep=34.62".
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?
547156111 116 WHITE srclist found no candidates.
547156111 116 WHITE image found no candidates.
List afterglow candidates for other finding charts.
547156270 275 U srclist found no candidates.
547156270 275 U image found no candidates.
547156874 879 WHITE srclist found no candidates.
547156874 879 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: -14.65844
GRB_ERROR: 5.25
GRB_RA: 331.14421
IMAGE_START_TIME: 19:48:26
MAGNITUDE: 19.3
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT