image overlap message for exposure 2 of trigger 987016
uvot_overlap.pl vrs. 2010-12-20b fem started at 200807d02h50m28s093362usUT
The observation of trigger 987016 started 2020-08-06T15:34:14.9
Examining file ./987016_g324_uvot_sky_image.fits
The exposure ID is 618420854
The exposure time is 249.935 (seconds)
The filter is U.
*** Warning -- found 3435 null pixels in the image.
The uvot region is centered at (52.9347,37.0828) with a roll angle of 80.1
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 (52.9050,37.0820) with a radius of 3.000 arc min
This is 1.422 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 7.11 sq. arc min or 0.25 of the BAT error circle
The XRT error circle is centered at (52.9321,37.0787) with a radius of 0.028 arc min
This is 0.272 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 987016
find_uvot_ag.pl vrs. 2017-02-17 fem started at 200807d02h50m43s724446usUT
Observation start time is 2020-08-06T15:34:14.9
Examining file ./987016_g324_uvot_catalog_image.fits
The exposure ID is 618420854
The exposure is 249.935 sec.
The bin size is 2 pixels
The filter is U
There are 10 detected source(s) for 987016_g324
Aspect correction adds 0.00094 degrees (0.225 sec of time = 2.69 arc sec) to RA
Aspect correction adds -0.00000 degrees (-0.01 arcsec) to Dec
Total aspect correction is 2.69 arcsec
Star catalogs centered at 52.9329 , 37.0781 with radius 2.47 arc min.
n_usno: 93 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 6 matched entries is 0.424" for 987016_g324
Mean and std. dev of mag. difference (MAG_DELTA) are 1.196 and 0.422 for 987016_g324
Found 4 entries without IDs and 4 entries that are acceptable afterglow candidates for 987016_g324.
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=52.9050 (03:31:37.20) DEC=37.0820 (+37:04:55.2)
XRT distances are from RA=52.9321 (03:31:43.71) DEC=37.0787 (+37:04:43.5)
*** WARNING 40 per cent of entries have no IDs.
-----------------
Entry 2 in the list of sources is a candidate afterglow for 987016_g324 with genie
ra=52.92747 (03:31:42.59) dec=37.06721 (+37:04:02.0) +/- 0.6" mag=11.74+/-0.14
dist=43.6 REFID=2 major=14.9 minor=1.1 flag=19 (neighbor+blended+aperture_incomplete)
*** The position of this source is inconsistent with the XRT position.
The position is 83.7 arc sec from the BAT position.
Found 2 entries in star catalog(s) within 20.0" of the candidate.
printing all entries
(Entries within 2 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
52.9281 37.0714 15.1 -1 USNO-B1 99.99 19.91 99.99
52.9335 37.0646 19.8 -1 USNO-B1 20.30 19.55 19.88
*** If XRT position is correct, then this is NOT the afterglow
*** unacceptable major profile of 14.9
-----------------
Entry 4 in the list of sources is a candidate afterglow for 987016_g324 with genie
ra=52.93863 (03:31:45.27) dec=37.06448 (+37:03:52.1) +/- 0.6" mag=11.74+/-0.14
dist=54.7 REFID=10 major=6.5 minor=1.0 flag=19 (neighbor+blended+aperture_incomplete)
*** The position of this source is inconsistent with the XRT position.
The position is 115.4 arc sec from the BAT position.
Found 2 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
52.9335 37.0646 14.6 -1 USNO-B1 20.30 19.55 19.88
52.9409 37.0648 6.6 -1 USNO-B1 99.99 19.73 99.99
*** If XRT position is correct, then this is NOT the afterglow
*** unacceptable major profile of 6.5
-----------------
Entry 6 in the list of sources is a candidate afterglow for 987016_g324 with genie
ra=52.90779 (03:31:37.87) dec=37.07216 (+37:04:19.8) +/- 0.6" mag=11.74+/-0.14
dist=73.8 REFID=7 major=9.6 minor=1.0 flag=19 (neighbor+blended+aperture_incomplete)
*** The position of this source is inconsistent with the XRT position.
The position is 36.3 arc sec from the BAT position.
Found 4 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
52.9143 37.0702 19.9 -1 USNO-B1 17.07 15.45 16.16
52.9114 37.0745 13.4 -1 USNO-B1 17.74 15.86 16.70
52.9101 37.0745 10.7 -1 USNO-B1 19.10 17.73 18.34
52.9086 37.0683 14.0 -1 USNO-B1 20.54 19.87 20.17
*** If XRT position is correct, then this is NOT the afterglow
*** unacceptable major profile of 9.6
-----------------
Entry 7 in the list of sources is a candidate afterglow for 987016_g324 with genie
ra=52.94789 (03:31:47.49) dec=37.06202 (+37:03:43.3) +/- 0.6" mag=11.74+/-0.14
dist=75.4 REFID=1 major=9.4 minor=1.0 flag=19 (neighbor+blended+aperture_incomplete)
*** The position of this source is inconsistent with the XRT position.
The position is 142.6 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 9.4
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
There are 49062.371 counts in the bkg source region of 6200.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 7.913 counts/pixel (5-sig UL in 4" is 19.34 mag) for 987016_g324
There are 1590.2101 counts in the xrt source region of 201.00000 pixels.
Rate in xrt region with 8 arcsec radius is 7.911 counts/pixel for 987016_g324
There are 9329.1270 counts in the xrt_bkg source region of 1154.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 8.084 counts/pixel (5-sig UL in 4" is 19.33 mag) for 987016_g324
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 19.90, XRT distances < 5",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 987016_618420854_200807d02h50m43s724446usUT_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(52.9347,37.0828,45")
fk5;-circle(52.9260021883004,37.0774374855123,6")
Region file: 987016_618420854_200807d02h50m43s724446usUT_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(52.93212,37.07875,8")
Region file: 987016_618420854_200807d02h50m43s724446usUT_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(52.93212,37.07875,25")
fk5;-circle(52.93212,37.07875,15")
fk5;-circle(52.9260021883004,37.0774374855123,6")
image paragraph message for exposure 2 of trigger 987016
IMAGE PROBLEM: damaged image (negative pixel value)
------ Start for Possible Stand-alone Circular ----
In response to GRB200806 (Swift/BAT trigger 987016) at 15:28:49 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
299 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 damaged image (negative pixel value). The 8'x8' region for the list
of sources generated on-board covers 100% of the XRT error circle. The list of
sources is typically complete to about 18.0 mag. No correction has been made
for the expected extinction corresponding to E(B-V) of 0.42.
------- notes for trigger 987016 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 200807d02h50m47s350060usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=987016
-expid=618420854 -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/987016/
Links to data for all triggers can be found at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/
The Genie image appears to be DAMAGED with a min. value of -11.693499.
XRT position found for srclist. XRT position found for Genie image. BAT
position found.
UVOT exposure began at MET 618420854.87556 or about 2020:219:15:34:09 UT
Found 400 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 9% of the srclist region. Found 37 sources in
srclist catalog. Found 3 srclist source(s) without IDs. There are 0 good
candidate(s) in the srclist catalog. Good candidates must be brighter than
18.12 mag.
Found 10 source(s) in Genie image catalog. Found 4 Genie image source(s)
without IDs. There are 0 good candidate(s) in the Genie image catalog. Good
candidates must be brighter than 19.90 mag. Found 89 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
10% of the Genie image region. The Genie image is INCOMPLETE with 3435 null
pixels.
The closest srclist source has ra= 52.9259 dec= 37.0774 mag=16.49 sep=18.46".
The closest Genie source has ra= 52.9260 dec= 37.0774 mag=15.82 sep=18.20".
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?
618420854 298 U srclist found no candidates.
618420854 298 U image found no candidates.
List afterglow candidates for other finding charts.
618420641 85 WHITE srclist found no candidates.
618420641 85 WHITE image found no candidates.
618421431 875 WHITE srclist found no candidates.
618421431 875 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: SRCLIST
FILTER: u
GRB_DEC: 37.07875
GRB_ERROR: 5
GRB_RA: 52.93212
IMAGE_START_TIME: 15:34:09
MAGNITUDE: 18.0
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT