image overlap message for exposure 2 of trigger 874475
uvot_overlap.pl vrs. 2010-12-20b fem started at 181203d14h29m08s168969usUT
The observation of trigger 874475 started 2018-12-03T12:14:03.2
Examining file ./874475_g315_uvot_sky_image.fits
The exposure ID is 565532043
The exposure time is 249.935 (seconds)
The filter is U.
*** Warning -- found 12477 null pixels in the image.
The uvot region is centered at (108.3516,-39.8104) with a roll angle of 142.4
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 (108.3690,-39.7690) with a radius of 3.000 arc min
This is 2.607 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 at most 3.73 sq. arc min or 0.13 of the BAT error circle
The XRT error circle is centered at (108.3486,-39.8019) with a radius of 0.033 arc min
This is 0.529 arc min from the center of the uvot region
The area of the XRT error circle is 0.003 sq. arc min
The UVOT/XRT overlap is 0.00 sq. arc min or 0.23 of the XRT error circle
image afterglow message for exposure 2 of trigger 874475
find_uvot_ag.pl vrs. 2017-02-17 fem started at 181203d14h29m28s615217usUT
Observation start time is 2018-12-03T12:14:03.2
Examining file ./874475_g315_uvot_catalog_image.fits
The exposure ID is 565532043
The exposure is 249.935 sec.
The bin size is 2 pixels
The filter is U
There are 10 detected source(s) for 874475_g315
Aspect correction adds 0.00228 degrees (0.547 sec of time = 6.30 arc sec) to RA
Aspect correction adds -0.00015 degrees (-0.54 arcsec) to Dec
Total aspect correction is 6.33 arcsec
Star catalogs centered at 108.3535 , -39.8071 with radius 2.84 arc min.
n_usno: 195 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 10 matched entries is 0.305" for 874475_g315
Mean and std. dev of mag. difference (MAG_DELTA) are 1.077 and 0.439 for 874475_g315
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 874475_g315.
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.
Magnitude criteria will be applied later.
BAT distances are from RA=108.3690 (07:13:28.56) DEC=-39.7690 (-39:46:08.4)
XRT distances are from RA=108.3486 (07:13:23.66) DEC=-39.8019 (-39:48:06.7)
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
There are 12390.463 counts in the bkg source region of 3105.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 3.990 counts/pixel (5-sig UL in 4" is 19.71 mag) for 874475_g315
There are 350.23981 counts in the xrt source region of 84.000000 pixels.
Rate in xrt region with 8 arcsec radius is 4.170 counts/pixel for 874475_g315
There are 2380.1824 counts in the xrt_bkg source region of 604.00000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 3.941 counts/pixel (5-sig UL in 4" is 19.72 mag) for 874475_g315
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 20.27, 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: 874475_565532043_181203d14h29m28s615217usUT_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(108.3516,-39.8104,45")
fk5;-circle(108.353893626007,-39.8112348130385,6")
fk5;-circle(108.356961054994,-39.8070301250275,6")
Region file: 874475_565532043_181203d14h29m28s615217usUT_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(108.34858,-39.80186,8")
Region file: 874475_565532043_181203d14h29m28s615217usUT_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(108.34858,-39.80186,25")
fk5;-circle(108.34858,-39.80186,15")
fk5;-circle(108.356961054994,-39.8070301250275,6")
image paragraph message for exposure 2 of trigger 874475
IMAGE PROBLEM: partial overlap
------ Start for Possible Stand-alone Circular ----
In response to GRB181203 (Swift/BAT trigger 874475) at 12:08:47 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
293 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 23% 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
0.24.
------- notes for trigger 874475 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 181203d14h29m36s992052usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=874475
-expid=565532043 -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/874475/
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 565532043.19114 or about 2018:337:12:13:58 UT
Found 932 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 17% of the srclist region. Found 81 sources in
srclist catalog. Found 6 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 10 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 20.27 mag. Found 191 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
16% of the Genie image region. The Genie image is INCOMPLETE with 12477 null
pixels.
Genie image analysis:
Found 12390.5 counts in the large background region of 3105.0 pixels or a rate
of 3.990 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 19.75 mag. for a
4-arcsec aperture.
Found 350.2 counts in the XRT position region of 84.0 pixels or a rate of 4.169
counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 0.077 +/- 0.080 (1-sigma) cps or
21.17 mag and a range from 20.39 to 99.99 mag. The 3-sigma UL at the XRT
position is 0.316 cps or 19.63 mag. The closest srclist source has ra= 108.3568
dec= -39.8071 mag=16.17 sep=29.48". The closest Genie source has ra= 108.3570
dec= -39.8070 mag=15.66 sep=29.73".
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?
565532043 293 U srclist found no candidates.
565532043 293 U image found no candidates.
List afterglow candidates for other finding charts.
565531829 79 WHITE srclist found no candidates.
565531829 79 WHITE image found no candidates.
565532622 872 WHITE srclist found no candidates.
565532622 872 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: SRCLIST
FILTER: u
GRB_DEC: -39.80186
GRB_ERROR: 5
GRB_RA: 108.34858
IMAGE_START_TIME: 12:13:58
MAGNITUDE: 18.0
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT