image overlap message for exposure 1 of trigger 869494
uvot_overlap.pl vrs. 2010-12-20b fem started at 181030d05h17m19s192427usUT
The observation of trigger 869494 started 2018-10-30T01:30:15.8
Examining file ./869494_g172_uvot_sky_image.fits
The exposure ID is 562555815
The exposure time is 117.984 (seconds)
The filter is WHITE.
The uvot region is centered at (146.9287,14.6561) with a roll angle of 109.9
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 (146.9220,14.6580) with a radius of 3.000 arc min
This is 0.403 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 (146.9260,14.6573) with a radius of 0.028 arc min
This is 0.169 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 1 of trigger 869494
find_uvot_ag.pl vrs. 2017-02-17 fem started at 181030d05h17m20s201653usUT
Observation start time is 2018-10-30T01:30:15.8
Examining file ./869494_g172_uvot_sources_image.fits
The exposure ID is 562555815
The exposure is 117.984 sec.
The bin size is 2 pixels
The filter is WHITE
There are 2 detected source(s) for 869494_g172
*** WARNING -- Aspect solution FAILED.
Results need to be checked by, for example, blinking image with DS9.
Star catalogs centered at 146.9277 , 14.6660 with radius 2.00 arc min.
n_usno: 18 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 869494_g172.
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=146.9220 (09:47:41.28) DEC=14.6580 (+14:39:28.8)
XRT distances are from RA=146.9260 (09:47:42.25) DEC=14.6573 (+14:39:26.3)
*** WARNING 100 per cent of entries have no IDs.
-----------------
Entry 0 in the list of sources is a candidate afterglow for 869494_g172 with genie
ra=146.92656 (09:47:42.37) dec=14.65770 (+14:39:27.7) +/- 0.8" mag=19.04+/-0.20
dist=2.3 REFID=1 major=1.1 minor=0.9 flag=0
Found 0 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)
uvot_check_outside found 13 of 13 good pixels
##### This source remains a candidate #####
It has no entries within 13.5" or brighter than 12 mag
-----------------
Entry 1 in the list of sources is a candidate afterglow for 869494_g172 with genie
ra=146.92882 (09:47:42.92) dec=14.67431 (+14:40:27.5) +/- 0.7" mag=16.42+/-0.14
dist=61.9 REFID=2 major=1.1 minor=1.0 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 63.3 arc sec from the BAT position.
Found 1 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
146.9287 14.6736 2.5 -1 USNO-B1 16.35 14.80 15.49 *
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 0 entries in star catalog(s) within 20" of the XRT position.
List UVOT sources within 20" of the XRT position:
Unmatched source ra=146.92656 (09:47:42.37) dec=14.65770 (+14:39:27.7) +/- 0.8" mag=19.04+/-0.20 dist=2.3 REFID=1 flag=0
There are 2.2857791E+05 counts in the bkg source region of 6197.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 36.885 counts/pixel (5-sig UL in 4" is 19.13 mag) for 869494_g172
There are 2120.5879 counts in the src source region of 51.000000 pixels.
Rate in src region with 4 arcsec radius is 41.580 counts/pixel for 869494_g172
There are 46356.250 counts in the cand_src_bkg source region of 1245.0000 pixels.
Rate in cand_src_bkg region from 15 to 25 arcsec is 37.234 counts/pixel (5-sig UL in 4" is 19.13 mag) for 869494_g172
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 19.69, XRT distances < 5",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 1 good candidate(s) found.
Results are questionable because aspect solution FAILED.
Region file: 869494_562555815_181030d05h17m20s201653usUT_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(146.9287,14.6561,45")
fk5;-circle(146.926556985519,14.6576950248141,6")
Region file: 869494_562555815_181030d05h17m20s201653usUT_cand_src.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(146.926556985519,14.6576950248141,4")
Region file: 869494_562555815_181030d05h17m20s201653usUT_cand_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(146.926556985519,14.6576950248141,25")
fk5;-circle(146.926556985519,14.6576950248141,15")
image paragraph message for exposure 1 of trigger 869494
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 GRB181030 (Swift/BAT trigger 869494) at 01:27:22 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 118 seconds with the White filter
starting 151 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 0.03.
------- notes for trigger 869494 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 181030d05h17m22s588486usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=869494
-expid=562555815 -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/869494/
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 562555815.77548 or about 2018:303:01:30:10 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. 1 source(s) are within 20.0" of the
xrt position. Found 2 Genie image source(s) without IDs. There are 1 good
candidate(s) in the Genie image catalog. Good candidates must be brighter than
19.69 mag. Found 14 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 2% of the Genie image region.
Report rejected UVOT sources within 10 arcsec XRT position.
Such sources are usually NOT the afterglow.
****THIS SOURCE NEAR XRT POSITION WAS REJECTED--USE WITH CAUTION****
UVOT took a finding chart exposure of 118 seconds with the White filter
starting 151 seconds after the BAT trigger. There is a candidate afterglow in
the rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 09:47:42.37 = 146.92656
DEC(J2000) = +14:39:27.7 = 14.65770
with a 90%-confidence error radius of about 0.85 arc sec. This position is 2.27
arc sec. from the center of the XRT error circle. The estimated magnitude is
19.04 with a 1-sigma error of about 0.20. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.03.
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?
562555815 151 WHITE srclist data are not available.
562555815 151 WHITE 146.92656 14.65770 19.04/19.7 2.3 image No
List afterglow candidates for other finding charts.
------- Tokens for Quick GCN -------