image overlap message for exposure 2 of trigger 879909
uvot_overlap.pl vrs. 2010-12-20b fem started at 181228d06h36m11s008855usUT
The observation of trigger 879909 started 2018-12-28T02:58:45.0
Examining file ./879909_g327_uvot_sky_image.fits
The exposure ID is 567658725
The exposure time is 249.946 (seconds)
The filter is U.
The uvot region is centered at (49.8116,13.2010) with a roll angle of 250.2
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 (49.8310,13.1950) with a radius of 3.000 arc min
This is 1.188 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 (49.8121,13.2021) with a radius of 0.030 arc min
This is 0.073 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 0.003 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 2 of trigger 879909
find_uvot_ag.pl vrs. 2017-02-17 fem started at 181228d06h36m20s687520usUT
Observation start time is 2018-12-28T02:58:45.0
Examining file ./879909_g327_uvot_catalog_image.fits
The exposure ID is 567658725
The exposure is 249.946 sec.
The bin size is 2 pixels
The filter is U
There are 2 detected source(s) for 879909_g327
Aspect correction adds -0.00017 degrees (-0.041 sec of time = -0.60 arc sec) to RA
Aspect correction adds 0.00004 degrees ( 0.14 arcsec) to Dec
Total aspect correction is 0.62 arcsec
Star catalogs centered at 49.8089 , 13.2109 with radius 2.00 arc min.
n_usno: 40 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 2 matched entries is 0.466" for 879909_g327
Mean and std. dev of mag. difference (MAG_DELTA) are 1.631 and 0.061 for 879909_g327
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 879909_g327.
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=49.8310 (03:19:19.44) DEC=13.1950 (+13:11:42.0)
XRT distances are from RA=49.8121 (03:19:14.91) DEC=13.2021 (+13:12:07.5)
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
There are 21302.998 counts in the bkg source region of 6197.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 3.438 counts/pixel (5-sig UL in 4" is 19.79 mag) for 879909_g327
There are 626.77679 counts in the xrt source region of 196.00000 pixels.
Rate in xrt region with 8 arcsec radius is 3.198 counts/pixel for 879909_g327
There are 4103.7461 counts in the xrt_bkg source region of 1173.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 3.499 counts/pixel (5-sig UL in 4" is 19.78 mag) for 879909_g327
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 20.35, 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: 879909_567658725_181228d06h36m20s687520usUT_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(49.8116,13.2010,45")
fk5;-circle(49.8076848640235,13.2034934538766,6")
Region file: 879909_567658725_181228d06h36m20s687520usUT_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(49.81212,13.20208,8")
Region file: 879909_567658725_181228d06h36m20s687520usUT_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(49.81212,13.20208,25")
fk5;-circle(49.81212,13.20208,15")
fk5;-circle(49.8076848640235,13.2034934538766,6")
image paragraph message for exposure 2 of trigger 879909
------ Start for Possible Stand-alone Circular ----
In response to GRB181228 (Swift/BAT trigger 879909) at 02:53:17 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
305 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
0.51.
------- notes for trigger 879909 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 181228d06h36m25s261791usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=879909
-expid=567658725 -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/879909/
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 567658725.0108 or about 2018:362:02:58:40 UT
Found 134 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 3% of the srclist region. Found 9 sources in
srclist catalog. Found 0 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 0 Genie image source(s) without
IDs. There are 0 good candidate(s) in the Genie image catalog. Good candidates
must be brighter than 20.35 mag. Found 36 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 6% of the
Genie image region.
Genie image analysis:
Found 21303.0 counts in the large background region of 6197.0 pixels or a rate
of 3.438 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 19.83 mag. for a
4-arcsec aperture.
Found 626.8 counts in the XRT position region of 196.0 pixels or a rate of
3.198 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is -0.236 +/- 0.109 (1-sigma) cps. The
3-sigma UL at the XRT position is 0.327 cps or 19.59 mag. The closest srclist
source has ra= 49.8465 dec= 13.2275 mag=17.67 sep=151.25". The closest Genie
source has ra= 49.8077 dec= 13.2035 mag=19.58 sep=16.36".
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?
567658725 305 U srclist found no candidates.
567658725 305 U image found no candidates.
List afterglow candidates for other finding charts.
567658513 93 WHITE srclist found no candidates.
567658513 93 WHITE image found no candidates.
567659278 858 WHITE srclist found no candidates.
567659278 858 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: 13.20208
GRB_ERROR: 5
GRB_RA: 49.81212
IMAGE_START_TIME: 02:58:40
MAGNITUDE: 19.6
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT