image overlap message for exposure 3 of trigger 971846
uvot_overlap.pl vrs. 2010-12-20b fem started at 200513d04h30m15s286396usUT
The observation of trigger 971846 started 2020-05-12T20:48:03.4
Examining file ./971846_g887_uvot_sky_image.fits
The exposure ID is 611009283
The exposure time is 117.554 (seconds)
The filter is WHITE.
The uvot region is centered at (7.4152,-2.2078) with a roll angle of 62.0
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 (7.3960,-2.1990) with a radius of 3.000 arc min
This is 1.268 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 7.15 sq. arc min or 0.25 of the BAT error circle
The XRT error circle is centered at (7.4147,-2.2104) with a radius of 0.023 arc min
This is 0.157 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 3 of trigger 971846
find_uvot_ag.pl vrs. 2017-02-17 fem started at 200513d04h30m31s551273usUT
Observation start time is 2020-05-12T20:48:03.4
Examining file ./971846_g887_uvot_sources_image.fits
The exposure ID is 611009283
The exposure is 117.554 sec.
The bin size is 2 pixels
The filter is WHITE
There are 1 detected source(s) for 971846_g887
*** WARNING -- Aspect solution FAILED.
Results need to be checked by, for example, blinking image with DS9.
Star catalogs centered at 7.3948 , -2.1872 with radius 2.00 arc min.
n_usno: 46 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 971846_g887.
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= 7.3960 (00:29:35.04) DEC=-2.1990 (-02:11:56.4)
XRT distances are from RA= 7.4147 (00:29:39.54) DEC=-2.2104 (-02:12:37.3)
*** WARNING 100 per cent of entries have no IDs.
-----------------
Entry 0 in the list of sources is a candidate afterglow for 971846_g887 with genie
ra=7.39478 (00:29:34.75) dec=-2.18717 (-02:11:13.8) +/- 0.8" mag=18.74+/-0.18
dist=110.1 REFID=1 major=0.7 minor=0.6 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 42.8 arc sec from the BAT position.
This source is near the edge of image (0.931)
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
7.3940 -2.1867 3.0 -1 USNO-B1 16.71 16.08 16.36 *
7.3929 -2.1867 7.1 -1 USNO-B1 18.15 16.11 17.02 *
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 20.25" 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
7.4120 -2.2080 12.9 -1 USNO-B1 99.99 20.04 99.99
7.4143 -2.2122 6.8 -1 USNO-B1 20.89 19.66 20.21
The closest star is 6.80" away.
List UVOT sources within 20" of the XRT position:
There are 2.3154638E+05 counts in the bkg source region of 6306.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 36.718 counts/pixel (5-sig UL in 4" is 19.13 mag) for 971846_g887
There are 7622.7085 counts in the xrt source region of 199.00000 pixels.
Rate in xrt region with 8 arcsec radius is 38.305 counts/pixel for 971846_g887
There are 46045.555 counts in the xrt_bkg source region of 1249.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 36.866 counts/pixel (5-sig UL in 4" is 19.13 mag) for 971846_g887
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 19.68, 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: 971846_611009283_200513d04h30m31s551273usUT_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(7.4152,-2.2078,45")
Region file: 971846_611009283_200513d04h30m31s551273usUT_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(7.41475,-2.21036,8")
Region file: 971846_611009283_200513d04h30m31s551273usUT_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(7.41475,-2.21036,25")
fk5;-circle(7.41475,-2.21036,15")
image paragraph message for exposure 3 of trigger 971846
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 GRB200512 (Swift/BAT trigger 971846) at 20:33:15 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 118 seconds with the White filter
starting 862 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 971846 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 200513d04h30m40s525940usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=971846
-expid=611009283 -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/971846/
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 611009283.3712 or about 2020:133:20:47:58 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 19.68 mag. Found 42 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 7% of the
Genie image region. The closest Genie source has ra= 7.3948 dec= -2.1872
mag=18.74 sep=110.14".
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?
611009283 862 WHITE srclist data are not available.
611009283 862 WHITE image found no candidates.
List afterglow candidates for other finding charts.
611008498 77 WHITE srclist found no candidates.
611008498 77 WHITE image found no candidates.
611008656 235 U srclist found no candidates.
611008656 235 U image found no candidates.
------- Tokens for Quick GCN -------