image overlap message for exposure 2 of trigger 808483
uvot_overlap.pl vrs. 2010-12-20b fem started at 180204d10h49m33s589586usUT
The observation of trigger 808483 started 2018-02-04T02:41:41.3
Examining file ./808483_g324_uvot_sky_image.fits
The exposure ID is 539404901
The exposure time is 249.924 (seconds)
The filter is U.
*** Warning -- found 9468 null pixels in the image.
The uvot region is centered at (330.1182,30.8416) 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 0.263 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 0.811 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 2 of trigger 808483
find_uvot_ag.pl vrs. 2017-02-17 fem started at 180204d10h49m43s853145usUT
Observation start time is 2018-02-04T02:41:41.3
Examining file ./808483_g324_uvot_catalog_image.fits
The exposure ID is 539404901
The exposure is 249.924 sec.
The bin size is 2 pixels
The filter is U
There are 2 detected source(s) for 808483_g324
Aspect correction adds 0.00026 degrees (0.063 sec of time = 0.81 arc sec) to RA
Aspect correction adds -0.00059 degrees (-2.11 arcsec) to Dec
Total aspect correction is 2.26 arcsec
Star catalogs centered at 330.1204 , 30.8455 with radius 2.27 arc min.
n_usno: 84 n_gsc: 95
*** 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 1 matched entries is 0.320" for 808483_g324
Mean and std. dev of mag. difference (MAG_DELTA) are 0.794 and 0.000 for 808483_g324
Found 1 entries without IDs and 1 entries that are acceptable afterglow candidates for 808483_g324.
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.
0 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)
*** WARNING 50 per cent of entries have no IDs.
-----------------
Entry 0 in the list of sources is a candidate afterglow for 808483_g324 with genie
ra=330.11062 (22:00:26.55) dec=30.84196 (+30:50:31.0) +/- 0.7" mag=11.77+/-0.14
dist=71.6 REFID=1 major=44.5 minor=1.7 flag=18 (blended+aperture_incomplete)
*** The position of this source is inconsistent with the XRT position.
The position is 27.1 arc sec from the BAT position.
Found 6 entries in star catalog(s) within 20.0" of the candidate.
printing all entries
(Entries within 2 arc sec of a source list entry are considered a match)
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
330.1103 30.8471 18.5 -1 USNO-B1 19.12 18.25 18.64
330.1107 30.8395 9.0 -1 USNO-B1 99.99 19.32 99.99
330.1093 30.8382 13.9 -1 USNO-B1 18.97 18.59 18.76
330.1103 30.8470 18.3 -1 GSC2.3 17.85 19.57 18.27
330.1108 30.8394 9.1 -1 GSC2.3 99.99 99.99 99.99
330.1094 30.8382 14.0 -1 GSC2.3 17.88 19.64 18.67
*** If XRT position is correct, then this is NOT the afterglow
*** unacceptable major profile of 44.5
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 51765.059 counts in the bkg source region of 4904.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 10.556 counts/pixel (5-sig UL in 4" is 19.19 mag) for 808483_g324
There are 861.54529 counts in the xrt source region of 204.00000 pixels.
Rate in xrt region with 8 arcsec radius is 4.223 counts/pixel for 808483_g324
There are 5457.4922 counts in the xrt_bkg source region of 1251.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 4.363 counts/pixel (5-sig UL in 4" is 19.67 mag) for 808483_g324
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 19.74, 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_539404901_180204d10h49m43s853145usUT_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(330.1182,30.8416,45")
fk5;-circle(330.110620014385,30.8419578946039,6")
Region file: 808483_539404901_180204d10h49m43s853145usUT_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")
Region file: 808483_539404901_180204d10h49m43s853145usUT_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(330.13329,30.83783,25")
fk5;-circle(330.13329,30.83783,15")
image paragraph message for exposure 2 of trigger 808483
SRCLIST PROBLEM: srclist filled telemetry buffer
------ 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 250 seconds with the U filter starting
304 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 19.2 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 18.0 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 180204d10h49m46s440957usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=808483
-expid=539404901 -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 539404901.294 or about 2018:035:02:41:36 UT
Found 1347 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 12% of the srclist region. Found 190 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 55 srclist
source(s) without IDs. There are 0 good candidate(s) in the srclist catalog.
Good candidates must be brighter than 18.12 mag.
Found 2 source(s) in Genie image catalog. Found 1 Genie image source(s) without
IDs. There are 0 good candidate(s) in the Genie image catalog. Good candidates
must be brighter than 19.74 mag. Found 95 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 12% of the
Genie image region. The Genie image is INCOMPLETE with 9468 null pixels.
Genie image analysis:
Found 51765.1 counts in the large background region of 4904.0 pixels or a rate
of 10.556 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 19.23 mag. for a
4-arcsec aperture.
Found 861.5 counts in the XRT position region of 204.0 pixels or a rate of
4.223 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is -0.114 +/- 0.127 (1-sigma) cps. The
3-sigma UL at the XRT position is 0.381 cps or 19.43 mag. The number of srclist
sources filled the available telemetry. The weakest source detected was 18.41
mag. The closest srclist source has ra= 330.1302 dec= 30.8561 mag=14.11
sep=66.62". The closest Genie source has ra= 330.1302 dec= 30.8562 mag=13.51
sep=66.95".
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?
539404901 303 U srclist found no candidates.
539404901 303 U image found no candidates.
List afterglow candidates for other finding charts.
539404689 91 WHITE srclist found no candidates.
539404689 91 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: 30.83783
GRB_ERROR: 5
GRB_RA: 330.13329
IMAGE_START_TIME: 02:41:36
MAGNITUDE: 19.4
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT