image overlap message for exposure 2 of trigger 884906
uvot_overlap.pl vrs. 2010-12-20b fem started at 190121d10h28m05s140078usUT
The observation of trigger 884906 started 2019-01-21T10:12:12.4
Examining file 884906_g314_uvot_sky_image.fits
The exposure ID is 569758332
The exposure time is 204.472 (seconds)
The filter is U.
The uvot region is centered at (247.8097,-47.8032) with a roll angle of 78.0
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 (247.7490,-47.7730) with a radius of 3.000 arc min
This is 3.042 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 3.12 sq. arc min or 0.11 of the BAT error circle
The XRT error circle is centered at (247.8088,-47.8065) with a radius of 0.087 arc min
This is 0.204 arc min from the center of the uvot region
The area of the XRT error circle is 0.024 sq. arc min
The UVOT/XRT overlap is 0.024 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 2 of trigger 884906
find_uvot_ag.pl vrs. 2017-02-17 fem started at 190121d10h28m06s183229usUT
Observation start time is 2019-01-21T10:12:12.4
Examining file 884906_g314_uvot_catalog_image.fits
The exposure ID is 569758332
The exposure is 204.472 sec.
The bin size is 2 pixels
The filter is U
There are 12 detected source(s) for 884906_g314
Aspect correction adds -0.00229 degrees (-0.549 sec of time = -5.53 arc sec) to RA
Aspect correction adds -0.00032 degrees (-1.14 arcsec) to Dec
Total aspect correction is 5.65 arcsec
Star catalogs centered at 247.8063 , -47.8048 with radius 2.79 arc min.
n_usno: 521 n_gsc: 0
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 11.6424
RA DEC Mag Color
bright star 0: 247.76332 (16:31:03.20) -47.79031 (-47:47:25.1) 11.64 USNO-V
Mean distance difference (CAT_DELTA) for 10 matched entries is 0.799" for 884906_g314
Mean and std. dev of mag. difference (MAG_DELTA) are 2.206 and 0.969 for 884906_g314
Found 2 entries without IDs and 0 entries that are acceptable afterglow candidates for 884906_g314.
Acceptable entries have no ID, XRT distances < 13", 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=247.7490 (16:30:59.76) DEC=-47.7730 (-47:46:22.8)
XRT distances are from RA=247.8088 (16:31:14.11) DEC=-47.8065 (-47:48:23.4)
Found NO acceptable entries.
Unidentified entry closest to XRT position is no. 6:
ra=247.83531 dec=-47.82014 +/- 0.8" mag=18.64+/-0.22 dist=80.7 REFID=12 flag=0
Found 1 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
247.8099 -47.8042 8.7 -1 USNO-B1 17.43 17.93 17.71
The closest star is 8.74" away.
List UVOT sources within 10" of the XRT position:
There are 93006.242 counts in the bkg source region of 6139.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 15.150 counts/pixel (5-sig UL in 4" is 18.77 mag) for 884906_g314
There are 3090.5303 counts in the xrt source region of 200.00000 pixels.
Rate in xrt region with 8 arcsec radius is 15.453 counts/pixel for 884906_g314
There are 18842.396 counts in the xrt_bkg source region of 1248.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 15.098 counts/pixel (5-sig UL in 4" is 18.77 mag) for 884906_g314
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 19.33, XRT distances < 13",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 884906_569758332_190121d10h28m06s183229usUT_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(247.8097,-47.8032,45")
fk5;-circle(247.820770612471,-47.7933345536269,6")
fk5;-circle(247.805045840758,-47.7911518094775,6")
fk5;-circle(247.809490240479,-47.7905623522505,6")
Region file: 884906_569758332_190121d10h28m06s183229usUT_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(247.8088,-47.8065,8")
Region file: 884906_569758332_190121d10h28m06s183229usUT_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(247.8088,-47.8065,25")
fk5;-circle(247.8088,-47.8065,15")
image paragraph message for exposure 2 of trigger 884906
THIS MESSAGE IS *NOT* READY FOR DISTRIBUTION.
MORE ANALYSIS IS REQUIRED TO DETERMINE WHETHER THERE IS AN AFTERGLOW CANDIDATE.
IMAGE PROBLEM: high density of stars
SRCLIST PROBLEM: high density of stars
See notes for more details.
WARNING -- because of the LARGE EXTINCTION, results should be used cautiously.
------ Start for Possible Stand-alone Circular ----
In response to GRB190121 (Swift/BAT trigger 884906) at 10:06:57 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 204 seconds with the U filter starting
292 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. Because of the density of catalogued stars, further analysis
is required to report an upper limit for any afterglow in the sub-image. The
8'x8' region for the list of sources generated on-board covers 100% of the XRT
error circle. Because of the density of catalogued stars, further analysis is
required to report an upper limit for any afterglow in the region. No
correction has been made for the large, but uncertain, extinction expected.
------- notes for trigger 884906 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 190121d10h28m07s891959usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=884906
-expid=569758332 -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/884906/
Links to data for all triggers can be found at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/
Unreliable extinction found for bat position. Unreliable extinction found for
xrt position. XRT position found for srclist. XRT position found for Genie
image. BAT position found.
*** Warning -- BAT and XRT error circles do NOT overlap.
UVOT exposure began at MET 569758332.44172 or about 2019:021:10:12:07 UT
Found 2529 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 43% of the srclist region. Found 72 sources in
srclist catalog. Found 7 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 12 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 19.33 mag. Found 517 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
46% of the Genie image region.
Genie image analysis:
Found 93006.2 counts in the large background region of 6139.0 pixels or a rate
of 15.150 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 18.81 mag. for a
4-arcsec aperture.
Found 3090.5 counts in the XRT position region of 200.0 pixels or a rate of
15.453 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 0.347 +/- 0.293 (1-sigma) cps or
19.53 mag and a range from 18.86 to 21.54 mag. The 3-sigma UL at the XRT
position is 1.227 cps or 18.16 mag. The closest srclist source has ra= 247.8059
dec= -47.8189 mag=17.19 sep=45.31". The closest Genie source has ra= 247.8055
dec= -47.8189 mag=16.51 sep=45.19".
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?
569758332 292 U srclist found no candidates.
569758332 292 U image found no candidates.
List afterglow candidates for other finding charts.
569758173 133 WHITE srclist found no candidates.
569758173 133 WHITE image found no candidates.
------- Tokens for Quick GCN -------