image overlap message for exposure 2 of trigger 927839
uvot_overlap.pl vrs. 2010-12-20b fem started at 191005d01h37m51s553355usUT
The observation of trigger 927839 started 2019-10-04T21:38:46.2
Examining file ./927839_g304_uvot_sky_image.fits
The exposure ID is 591917926
The exposure time is 93.398 (seconds)
The filter is U.
The uvot region is centered at (49.2071,-39.6356) with a roll angle of 131.8
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 (49.1770,-39.6130) with a radius of 3.000 arc min
This is 1.940 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 6.31 sq. arc min or 0.22 of the BAT error circle
The XRT error circle is centered at (49.2040,-39.6350) with a radius of 0.033 arc min
This is 0.145 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 927839
find_uvot_ag.pl vrs. 2017-02-17 fem started at 191005d01h37m58s845329usUT
Observation start time is 2019-10-04T21:38:46.2
Examining file ./927839_g304_uvot_sources_image.fits
The exposure ID is 591917926
The exposure is 93.398 sec.
The bin size is 2 pixels
The filter is U
There are 2 detected source(s) for 927839_g304
*** WARNING -- Aspect solution FAILED.
Results need to be checked by, for example, blinking image with DS9.
Star catalogs centered at 49.2155 , -39.6272 with radius 2.00 arc min.
n_usno: 59 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Found 2 entries without IDs and 2 entries that are acceptable afterglow candidates for 927839_g304.
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=49.1770 (03:16:42.48) DEC=-39.6130 (-39:36:46.8)
XRT distances are from RA=49.2040 (03:16:48.96) DEC=-39.6350 (-39:38:06.1)
*** WARNING 100 per cent of entries have no IDs.
-----------------
Entry 0 in the list of sources is a candidate afterglow for 927839_g304 with genie
ra=49.22487 (03:16:53.97) dec=-39.62731 (-39:37:38.3) +/- 0.8" mag=17.43+/-0.16
dist=64.2 REFID=1 major=1.0 minor=0.8 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 142.4 arc sec from the BAT position.
Found 2 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
49.2267 -39.6282 6.1 -1 USNO-B1 17.84 16.77 17.25 *
49.2291 -39.6231 19.2 -1 USNO-B1 21.22 20.09 20.59
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 13.5" or brighter than 12 mag
-----------------
Entry 1 in the list of sources is a candidate afterglow for 927839_g304 with genie
ra=49.20607 (03:16:49.46) dec=-39.62703 (-39:37:37.3) +/- 0.7" mag=14.25+/-0.14
dist=29.4 REFID=2 major=0.9 minor=0.9 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 95.1 arc sec from the BAT position.
Found 10 entries in star catalog(s) within 20.0" of the candidate.
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
49.2114 -39.6279 15.0 -1 USNO-B1 21.06 19.90 20.42
49.2113 -39.6286 15.5 -1 USNO-B1 20.85 20.09 20.42
49.2098 -39.6274 10.4 -1 USNO-B1 20.06 18.37 19.12 *
49.2104 -39.6241 16.1 -1 USNO-B1 21.24 20.85 21.02
49.2077 -39.6280 5.8 -1 USNO-B1 14.09 12.61 13.26 *
49.2039 -39.6281 7.3 -1 USNO-B1 20.21 19.69 19.92 *
49.2031 -39.6291 11.1 -1 USNO-B1 20.46 20.61 20.54 *
49.2028 -39.6281 9.7 -1 USNO-B1 21.04 19.73 20.31 *
49.2030 -39.6298 12.9 -1 USNO-B1 21.16 20.20 20.63 *
49.1999 -39.6299 20.0 -1 USNO-B1 21.30 20.60 20.91
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 13.5" or brighter than 12 mag
Found 2 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
49.2030 -39.6298 19.2 -1 USNO-B1 21.16 20.20 20.63
49.1979 -39.6357 17.1 -1 USNO-B1 99.99 20.36 99.99
The closest star is 17.09" away.
List UVOT sources within 20" of the XRT position:
There are 8477.0898 counts in the bkg source region of 6195.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 1.368 counts/pixel (5-sig UL in 4" is 19.23 mag) for 927839_g304
There are 239.12222 counts in the xrt source region of 196.00000 pixels.
Rate in xrt region with 8 arcsec radius is 1.220 counts/pixel for 927839_g304
There are 1665.9067 counts in the xrt_bkg source region of 1241.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 1.342 counts/pixel (5-sig UL in 4" is 19.24 mag) for 927839_g304
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 19.78, 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: 927839_591917926_191005d01h37m58s845329usUT_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(49.2071,-39.6356,45")
fk5;-circle(49.2060676005109,-39.6270331152785,6")
Region file: 927839_591917926_191005d01h37m58s845329usUT_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(49.20400,-39.63503,8")
Region file: 927839_591917926_191005d01h37m58s845329usUT_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(49.20400,-39.63503,25")
fk5;-circle(49.20400,-39.63503,15")
fk5;-circle(49.2060676005109,-39.6270331152785,6")
image paragraph message for exposure 2 of trigger 927839
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 GRB191004 (Swift/BAT trigger 927839) at 21:33:41 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 93 seconds with the U filter starting
280 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. Data 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 0.02.
------- notes for trigger 927839 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 191005d01h38m02s365583usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=927839
-expid=591917926 -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/927839/
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 591917926.20552 or about 2019:277:21:38:41 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 19.78 mag. Found 55 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 9% of the
Genie image region. The closest Genie source has ra= 49.2061 dec= -39.6270
mag=14.25 sep=29.35".
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?
591917926 280 ? srclist data are not available.
591917926 280 U image found no candidates.
List afterglow candidates for other finding charts.
591917714 68 WHITE 49.20495 -39.63435 18.80/19.2 3.6 srclist Yes
591917714 68 WHITE 49.20458 -39.63425 18.00/20.9 3.2 image Yes
------- Tokens for Quick GCN -------