image overlap message for exposure 2 of trigger 895257
uvot_overlap.pl vrs. 2010-12-20b fem started at 190327d09h31m45s387984usUT
The observation of trigger 895257 started 2019-03-27T09:15:03.3
Examining file 895257_g885_uvot_sky_image.fits
The exposure ID is 575370903
The exposure time is 37.116 (seconds)
The filter is U.
*** Warning -- found 15251 null pixels in the image.
The uvot region is centered at (314.6989,41.7779) with a roll angle of 116.3
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 (314.6980,41.8220) with a radius of 3.000 arc min
This is 2.645 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 4.23 sq. arc min or 0.15 of the BAT error circle
The XRT error circle is centered at (314.6953,41.7772) with a radius of 0.098 arc min
This is 0.165 arc min from the center of the uvot region
The area of the XRT error circle is 0.030 sq. arc min
The UVOT/XRT overlap is 0.00 sq. arc min or 0.00 of the XRT error circle
image afterglow message for exposure 2 of trigger 895257
find_uvot_ag.pl vrs. 2017-02-17 fem started at 190327d09h31m46s530861usUT
Observation start time is 2019-03-27T09:15:03.3
Examining file 895257_g885_uvot_sources_image.fits
The exposure ID is 575370903
The exposure is 37.116 sec.
The bin size is 2 pixels
The filter is U
There are 1 detected source(s) for 895257_g885
*** WARNING -- Aspect solution FAILED.
Results need to be checked by, for example, blinking image with DS9.
Star catalogs centered at 314.7221 , 41.7747 with radius 2.00 arc min.
n_usno: 190 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Found 1 entries without IDs and 1 entries that are acceptable afterglow candidates for 895257_g885.
Acceptable entries have no ID, XRT distances < 14.75", 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=314.6980 (20:58:47.52) DEC=41.8220 (+41:49:19.2)
XRT distances are from RA=314.6953 (20:58:46.87) DEC=41.7772 (+41:46:37.9)
*** WARNING 100 per cent of entries have no IDs.
-----------------
Entry 0 in the list of sources is a candidate afterglow for 895257_g885 with genie
ra=314.72207 (20:58:53.30) dec=41.77475 (+41:46:29.1) +/- 1.4" mag=18.87+/-0.43
dist=72.4 REFID=1 major=1.0 minor=1.0 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 182.0 arc sec from the BAT position.
Found 8 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
314.7231 41.7744 2.9 -1 USNO-B1 17.31 13.32 15.09 *
314.7237 41.7750 4.5 -1 USNO-B1 99.99 18.49 99.99 *
314.7229 41.7761 5.3 -1 USNO-B1 20.18 18.54 19.27 *
314.7211 41.7726 8.3 -1 USNO-B1 20.24 18.73 19.40 *
314.7214 41.7724 8.8 -1 USNO-B1 99.99 18.63 99.99 *
314.7200 41.7768 9.2 -1 USNO-B1 20.44 18.77 19.51 *
314.7209 41.7714 12.3 -1 USNO-B1 99.99 18.94 99.99 *
314.7273 41.7785 19.5 -1 USNO-B1 19.73 17.35 18.41
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
314.6981 41.7770 7.5 -1 USNO-B1 16.73 13.82 15.12
314.6978 41.7799 11.7 -1 USNO-B1 20.37 17.41 18.73
The closest star is 7.48" away.
List UVOT sources within 20" of the XRT position:
There are 3548.0430 counts in the bkg source region of 1820.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 1.949 counts/pixel (5-sig UL in 4" is 18.03 mag) for 895257_g885
There are 0.0000000 counts in the xrt source region of 0.0000000 pixels.
There are 14.418106 counts in the xrt_bkg source region of 5.0000000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 2.884 counts/pixel (5-sig UL in 4" is 17.82 mag) for 895257_g885
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 18.59, XRT distances < 14.75",
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: 895257_575370903_190327d09h31m46s530861usUT_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(314.6989,41.7779,45")
Region file: 895257_575370903_190327d09h31m46s530861usUT_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(314.6953,+41.7772,8")
Region file: 895257_575370903_190327d09h31m46s530861usUT_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(314.6953,+41.7772,25")
fk5;-circle(314.6953,+41.7772,15")
image paragraph message for exposure 2 of trigger 895257
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.
WARNING -- because of the LARGE EXTINCTION, results should be used cautiously.
------ Start for Possible Stand-alone Circular ----
In response to GRB190327 (Swift/BAT trigger 895257) at 09:00:17 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 37 seconds with the U filter starting
863 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
large, but uncertain, extinction expected.
------- notes for trigger 895257 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 190327d09h31m48s102596usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=895257
-expid=575370903 -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/895257/
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 Genie image. BAT position found.
UVOT exposure began at MET 575370903.31372 or about 2019:086:09:14:58 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 1 source(s) in Genie image catalog. Found 1 Genie image source(s) without
IDs. There are 0 good candidate(s) in the Genie image catalog. Good candidates
must be brighter than 18.59 mag. Found 186 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 32% of the
Genie image region. The Genie image is INCOMPLETE with 15251 null pixels.
The closest Genie source has ra= 314.7221 dec= 41.7747 mag=18.87 sep=72.42".
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?
575370903 863 U srclist data are not available.
575370903 863 U image found no candidates.
List afterglow candidates for other finding charts.
575370171 131 U srclist found no candidates.
575370171 131 U image found no candidates.
------- Tokens for Quick GCN -------