image overlap message for exposure 2 of trigger 946476
uvot_overlap.pl vrs. 2010-12-20b fem started at 191228d17h22m21s594100usUT
The observation of trigger 946476 started 2019-12-28T00:06:33.0
Examining file ./946476_g313_uvot_sky_image.fits
The exposure ID is 599184393
The exposure time is 249.890 (seconds)
The filter is U.
The uvot region is centered at (5.3438,-8.6881) with a roll angle of 247.1
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 (5.3390,-8.6700) with a radius of 3.000 arc min
This is 1.125 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 (5.3469,-8.6828) with a radius of 0.023 arc min
This is 0.372 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 946476
find_uvot_ag.pl vrs. 2017-02-17 fem started at 191228d17h22m36s060005usUT
Observation start time is 2019-12-28T00:06:33.0
Examining file ./946476_g313_uvot_sources_image.fits
The exposure ID is 599184393
The exposure is 249.890 sec.
The bin size is 2 pixels
The filter is U
There are 2 detected source(s) for 946476_g313
*** WARNING -- Aspect solution FAILED.
Results need to be checked by, for example, blinking image with DS9.
Star catalogs centered at 5.3424 , -8.7070 with radius 2.00 arc min.
n_usno: 44 n_gsc: 0
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 9.4287
RA DEC Mag Color
bright star 0: 5.33391 (00:21:20.14) -8.73339 (-08:44:00.2) 9.43 USNO-V
Found 2 entries without IDs and 2 entries that are acceptable afterglow candidates for 946476_g313.
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= 5.3390 (00:21:21.36) DEC=-8.6700 (-08:40:12.0)
XRT distances are from RA= 5.3469 (00:21:23.25) DEC=-8.6828 (-08:40:57.9)
*** WARNING 100 per cent of entries have no IDs.
-----------------
Entry 0 in the list of sources is a candidate afterglow for 946476_g313 with genie
ra=5.34616 (00:21:23.08) dec=-8.71019 (-08:42:36.7) +/- 0.7" mag=16.24+/-0.14
dist=98.8 REFID=1 major=1.1 minor=1.0 flag=16 (aperture_incomplete)
*** The position of this source is inconsistent with the XRT position.
The position is 146.9 arc sec from the BAT position.
This source is near the edge of image (0.960)
Found 1 entries in star catalog(s) within 20.0" of the candidate.
printing all entries
(Entries within 12 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
5.3448 -8.7102 4.9 -1 USNO-B1 15.84 15.06 15.41 *
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 20.25" or brighter than 12 mag
-----------------
Entry 1 in the list of sources is a candidate afterglow for 946476_g313 with genie
ra=5.33859 (00:21:21.26) dec=-8.70383 (-08:42:13.8) +/- 0.8" mag=18.54+/-0.17
dist=81.4 REFID=2 major=4.9 minor=3.8 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 121.8 arc sec from the BAT position.
Found 0 entries in star catalog(s) within 20.0" of the candidate.
*** If XRT position is correct, then this is NOT the afterglow
*** unacceptable major profile of 4.9
Found 1 entries in star catalog(s) within 20" of the XRT position.
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
5.3457 -8.6870 15.9 -1 USNO-B1 20.93 20.01 20.42
The closest star is 15.94" away.
List UVOT sources within 20" of the XRT position:
There are 25480.061 counts in the bkg source region of 6309.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 4.039 counts/pixel (5-sig UL in 4" is 19.71 mag) for 946476_g313
There are 805.13312 counts in the xrt source region of 199.00000 pixels.
Rate in xrt region with 8 arcsec radius is 4.046 counts/pixel for 946476_g313
There are 5116.8682 counts in the xrt_bkg source region of 1245.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 4.110 counts/pixel (5-sig UL in 4" is 19.70 mag) for 946476_g313
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 20.26, XRT distances < 5",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Results are questionable because aspect solution FAILED.
Region file: 946476_599184393_191228d17h22m36s060005usUT_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(5.3438,-8.6881,45")
Region file: 946476_599184393_191228d17h22m36s060005usUT_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(5.34687,-8.68275,8")
Region file: 946476_599184393_191228d17h22m36s060005usUT_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(5.34687,-8.68275,25")
fk5;-circle(5.34687,-8.68275,15")
image paragraph message for exposure 2 of trigger 946476
THIS MESSAGE IS *NOT* READY FOR DISTRIBUTION.
MORE ANALYSIS IS REQUIRED TO DETERMINE WHETHER THERE IS AN AFTERGLOW CANDIDATE.
IMAGE PROBLEM: no aspect solution
SRCLIST PROBLEM: no srclist afterglow info
See notes for more details.
------ Start for Possible Stand-alone Circular ----
In response to GRB191228 (Swift/BAT trigger 946476) at 00:01:19 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
289 seconds after the BAT trigger. No credible afterglow candidate has been
found in the initial data products. The 2.7'x2.7' sub-image processing FAILED
because of no aspect solution. Results from the list of sources generated
on-board are not available at this time. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.04.
------- notes for trigger 946476 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 191228d17h22m41s787705usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=946476
-expid=599184393 -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/946476/
Links to data for all triggers can be found at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/
XRT position found for Genie image. BAT position found.
UVOT exposure began at MET 599184393.01536 or about 2019:362:00:06:28 UT
No information found about the number of stars in the star catalog for srclist
region.
THERE IS NO ASPECT SOLUTION for the image data.
Found 2 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 20.26 mag. Found 40 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 6% of the
Genie image region. The closest Genie source has ra= 5.3386 dec= -8.7038
mag=18.54 sep=81.40".
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?
599184393 289 U srclist data are not available.
599184393 289 U image found no candidates.
List afterglow candidates for other finding charts.
599184235 131 WHITE srclist found no candidates.
599184235 131 WHITE image found no candidates.
599184970 866 WHITE srclist found no candidates.
599184970 866 WHITE image found no candidates.
------- Tokens for Quick GCN -------