image overlap message for exposure 1 of trigger 808483
uvot_overlap.pl vrs. 2010-12-20b fem started at 180204d10h49m33s056476usUT
The observation of trigger 808483 started 2018-02-04T02:38:09.2
Examining file ./808483_g112_uvot_sky_image.fits
The exposure ID is 539404689
The exposure time is 149.835 (seconds)
The filter is WHITE.
The uvot region is centered at (330.1157,30.8417) with a roll angle of 196.0
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 (330.1180,30.8460) with a radius of 3.000 arc min
This is 0.282 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 (330.1333,30.8378) with a radius of 0.023 arc min
This is 0.936 arc min from the center of the uvot region
The area of the XRT error circle is 0.002 sq. arc min
The UVOT/XRT overlap is 0.002 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 1 of trigger 808483
find_uvot_ag.pl vrs. 2017-02-17 fem started at 180204d10h49m36s673724usUT
Observation start time is 2018-02-04T02:38:09.2
Examining file ./808483_g112_uvot_catalog_image.fits
The exposure ID is 539404689
The exposure is 149.835 sec.
The bin size is 2 pixels
The filter is WHITE
There are 11 detected source(s) for 808483_g112
Aspect correction adds 0.00034 degrees (0.082 sec of time = 1.05 arc sec) to RA
Aspect correction adds -0.00072 degrees (-2.59 arcsec) to Dec
Total aspect correction is 2.79 arcsec
Star catalogs centered at 330.1188 , 30.8450 with radius 2.19 arc min.
n_usno: 74 n_gsc: 84
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 11.78074
RA DEC Mag Color
bright star 0: 330.12305 (22:00:29.53) 30.85735 (+30:51:26.5) 11.78 USNO-V
Mean distance difference (CAT_DELTA) for 9 matched entries is 0.333" for 808483_g112
Mean and std. dev of mag. difference (MAG_DELTA) are 1.008 and 0.689 for 808483_g112
Found 2 entries without IDs and 0 entries that are acceptable afterglow candidates for 808483_g112.
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.
2 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=330.1180 (22:00:28.32) DEC=30.8460 (+30:50:45.6)
XRT distances are from RA=330.1333 (22:00:31.99) DEC=30.8378 (+30:50:16.2)
Found NO acceptable entries.
Unidentified entry closest to XRT position is no. 1:
ra=330.12199 dec= 30.85264 +/- 0.7" mag=19.69+/-0.18 dist=63.7 REFID=7 flag=0
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
330.1329 30.8378 1.2 -1 USNO-B1 20.43 19.27 19.78
330.1329 30.8378 1.1 -1 GSC2.3 18.93 21.15 19.03
The closest star is 1.10" away.
List UVOT sources within 10" of the XRT position:
There are 1.0132080E+05 counts in the bkg source region of 5865.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 17.275 counts/pixel (5-sig UL in 4" is 19.80 mag) for 808483_g112
There are 3352.7754 counts in the xrt source region of 197.00000 pixels.
Rate in xrt region with 8 arcsec radius is 17.019 counts/pixel for 808483_g112
XRT source is too far (56.1258100483356") from center -- do not compute local background.
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 20.36, 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: 808483_539404689_180204d10h49m36s673724usUT_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(330.1157,30.8417,45")
fk5;-circle(330.110311867949,30.8471221852241,6")
fk5;-circle(330.121985941787,30.8526356320587,6")
fk5;-circle(330.109299038214,30.838189940152,6")
fk5;-circle(330.109945801949,30.8347676994108,6")
fk5;-circle(330.107663921363,30.8305674432703,6")
Region file: 808483_539404689_180204d10h49m36s673724usUT_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(330.13329,30.83783,8")
image paragraph message for exposure 1 of trigger 808483
------ Start for Possible Stand-alone Circular ----
In response to GRB180204 (Swift/BAT trigger 808483) at 02:36:16 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 92 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
0.10.
------- notes for trigger 808483 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 180204d10h49m39s053785usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=808483
-expid=539404689 -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/808483/
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 539404689.21922 or about 2018:035:02:38:04 UT
Found 595 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 12% of the srclist region. Found 95 sources in
srclist catalog. Found 4 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 11 source(s) in Genie image catalog. Found 2 Genie image source(s)
without IDs. There are 0 good candidate(s) in the Genie image catalog. Good
candidates must be brighter than 20.36 mag. Found 84 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
12% of the Genie image region.
Genie image analysis:
Found 101320.8 counts in the large background region of 5865.0 pixels or a rate
of 17.275 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 19.80 mag. for a
4-arcsec aperture.
Found 3352.8 counts in the XRT position region of 197.0 pixels or a rate of
17.019 counts/pixel in a radius of 8.0 arcsec. The net count rate (using large
background region) at the XRT position is -0.336 +/- 0.393 (1-sigma) cps. The
3-sigma UL at the XRT position is 1.178 cps or 19.60 mag. The closest srclist
source has ra= 330.1405 dec= 30.8487 mag=19.42 sep=44.95". The closest Genie
source has ra= 330.1405 dec= 30.8486 mag=18.59 sep=44.68".
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?
539404689 91 WHITE srclist found no candidates.
539404689 91 WHITE image found no candidates.
List afterglow candidates for other finding charts.
539404901 303 U srclist found no candidates.
539404901 303 U image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: 30.83783
GRB_ERROR: 5
GRB_RA: 330.13329
IMAGE_START_TIME: 02:38:04
MAGNITUDE: 19.6
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT