image overlap message for exposure 2 of trigger 977310
uvot_overlap.pl vrs. 2010-12-20b fem started at 200612d20h13m28s770205usUT
The observation of trigger 977310 started 2020-06-12T04:45:09.8
Examining file ./977310_g331_uvot_sky_image.fits
The exposure ID is 613629909
The exposure time is 67.786 (seconds)
The filter is U.
*** Warning -- found 1874 null pixels in the image.
The uvot region is centered at (302.7095,-45.3344) with a roll angle of 109.1
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 (302.6810,-45.3570) with a radius of 3.000 arc min
This is 1.810 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 6.51 sq. arc min or 0.23 of the BAT error circle
The XRT error circle is centered at (302.7020,-45.3355) with a radius of 0.025 arc min
This is 0.322 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 2 of trigger 977310
find_uvot_ag.pl vrs. 2017-02-17 fem started at 200612d20h13m44s940205usUT
Observation start time is 2020-06-12T04:45:09.8
Examining file ./977310_g331_uvot_catalog_image.fits
The exposure ID is 613629909
The exposure is 67.786 sec.
The bin size is 2 pixels
The filter is U
There are 7 detected source(s) for 977310_g331
Aspect correction adds 0.00188 degrees (0.450 sec of time = 4.75 arc sec) to RA
Aspect correction adds 0.00098 degrees ( 3.51 arcsec) to Dec
Total aspect correction is 5.90 arcsec
Star catalogs centered at 302.7080 , -45.3363 with radius 2.48 arc min.
n_usno: 110 n_gsc: 0
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 10.6974
RA DEC Mag Color
bright star 0: 302.75555 (20:11:01.33) -45.31954 (-45:19:10.3) 10.70 USNO-V
Mean distance difference (CAT_DELTA) for 1 matched entries is 0.698" for 977310_g331
Mean and std. dev of mag. difference (MAG_DELTA) are 2.941 and 0.000 for 977310_g331
Found 6 entries without IDs and 6 entries that are acceptable afterglow candidates for 977310_g331.
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.
0 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=302.6810 (20:10:43.44) DEC=-45.3570 (-45:21:25.2)
XRT distances are from RA=302.7020 (20:10:48.49) DEC=-45.3355 (-45:20:07.8)
*** WARNING 85 per cent of entries have no IDs.
-----------------
Entry 1 in the list of sources is a candidate afterglow for 977310_g331 with genie
ra=302.69024 (20:10:45.66) dec=-45.34230 (-45:20:32.3) +/- 1.0" mag=18.27+/-0.24
dist=38.6 REFID=5 major=2.1 minor=1.3 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 57.9 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
302.6932 -45.3437 8.9 -1 USNO-B1 19.17 16.29 17.57
302.6936 -45.3443 11.1 -1 USNO-B1 17.14 15.33 16.13
*** If XRT position is correct, then this is NOT the afterglow
*** unacceptable major profile of 2.1
-----------------
Entry 2 in the list of sources is a candidate afterglow for 977310_g331 with genie
ra=302.68627 (20:10:44.70) dec=-45.33963 (-45:20:22.7) +/- 1.0" mag=18.47+/-0.27
dist=42.6 REFID=4 major=1.4 minor=0.9 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 63.9 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
-----------------
Entry 3 in the list of sources is a candidate afterglow for 977310_g331 with genie
ra=302.69512 (20:10:46.83) dec=-45.34601 (-45:20:45.7) +/- 0.8" mag=17.34+/-0.18
dist=41.7 REFID=6 major=2.1 minor=1.3 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 53.3 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
302.6932 -45.3437 9.8 -1 USNO-B1 19.17 16.29 17.57
302.6936 -45.3443 7.4 -1 USNO-B1 17.14 15.33 16.13
*** If XRT position is correct, then this is NOT the afterglow
*** unacceptable major profile of 2.1
-----------------
Entry 4 in the list of sources is a candidate afterglow for 977310_g331 with genie
ra=302.67491 (20:10:41.98) dec=-45.33271 (-45:19:57.7) +/- 0.9" mag=18.18+/-0.23
dist=69.4 REFID=3 major=1.3 minor=0.6 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 88.8 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
302.6714 -45.3319 9.4 -1 USNO-B1 17.29 16.25 16.71
302.6712 -45.3293 15.4 -1 USNO-B1 18.76 18.29 18.50
*** If XRT position is correct, then this is NOT the afterglow
-----------------
Entry 5 in the list of sources is a candidate afterglow for 977310_g331 with genie
ra=302.71278 (20:10:51.07) dec=-45.35935 (-45:21:33.7) +/- 0.8" mag=17.15+/-0.17
dist=90.1 REFID=1 major=2.0 minor=1.1 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 80.8 arc sec from the BAT position.
This source is near the edge of image (0.899)
Found 3 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
302.7103 -45.3600 6.7 -1 USNO-B1 18.16 18.36 18.27
302.7100 -45.3603 7.9 -1 USNO-B1 18.85 18.02 18.39
302.7142 -45.3620 10.3 -1 USNO-B1 99.99 20.02 99.99
*** If XRT position is correct, then this is NOT the afterglow
*** unacceptable major profile of 2.0
-----------------
Entry 6 in the list of sources is a candidate afterglow for 977310_g331 with genie
ra=302.74109 (20:10:57.86) dec=-45.32808 (-45:19:41.1) +/- 0.8" mag=17.27+/-0.17
dist=102.4 REFID=7 major=1.9 minor=0.7 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 184.3 arc sec from the BAT position.
This source is near the edge of image (0.897)
Found 3 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
302.7352 -45.3263 16.3 -1 USNO-B1 20.43 19.29 19.80
302.7374 -45.3270 10.1 -1 USNO-B1 20.66 20.11 20.35
302.7402 -45.3332 18.5 -1 USNO-B1 19.78 18.36 18.99
*** If XRT position is correct, then this is NOT the afterglow
*** unacceptable major profile of 1.9
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
There are 23126.168 counts in the bkg source region of 6200.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 3.730 counts/pixel (5-sig UL in 4" is 18.33 mag) for 977310_g331
There are 744.67914 counts in the xrt source region of 200.00000 pixels.
Rate in xrt region with 8 arcsec radius is 3.723 counts/pixel for 977310_g331
There are 4399.7148 counts in the xrt_bkg source region of 1166.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 3.773 counts/pixel (5-sig UL in 4" is 18.33 mag) for 977310_g331
There are 1 candidate(s) outside XRT error circle with mag < 18.33
Good candidates have no ID, acceptable profiles,
mag between 9.01 and 18.89, 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: 977310_613629909_200612d20h13m44s940205usUT_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(302.7095,-45.3344,45")
fk5;-circle(302.701315367281,-45.3307693734999,6")
Region file: 977310_613629909_200612d20h13m44s940205usUT_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(302.70204,-45.33550,8")
Region file: 977310_613629909_200612d20h13m44s940205usUT_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(302.70204,-45.33550,25")
fk5;-circle(302.70204,-45.33550,15")
fk5;-circle(302.701315367281,-45.3307693734999,6")
image paragraph message for exposure 2 of trigger 977310
IMAGE PROBLEM: damaged image (negative pixel value)
------ Start for Possible Stand-alone Circular ----
In response to GRB200612 (Swift/BAT trigger 977310) at 04:39:37 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 68 seconds with the U filter starting
307 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 0.03.
------- notes for trigger 977310 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 200612d20h13m48s427828usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=977310
-expid=613629909 -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/977310/
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 -1.531119.
XRT position found for srclist. XRT position found for Genie image. BAT
position found.
UVOT exposure began at MET 613629909.81946 or about 2020:164:04:45:04 UT
Found 524 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 10% of the srclist region. Found 21 sources in
srclist catalog. Found 2 srclist source(s) without IDs. There are 0 good
candidate(s) in the srclist catalog. Good candidates must be brighter than
17.41 mag.
Found 7 source(s) in Genie image catalog. Found 6 Genie image source(s) without
IDs. There are 0 good candidate(s) in the Genie image catalog. Good candidates
must be brighter than 18.89 mag. Found 106 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 11% of the
Genie image region. The Genie image is INCOMPLETE with 1874 null pixels.
The closest srclist source has ra= 302.6710 dec= -45.3317 mag=19.16 sep=79.85".
The closest Genie source has ra= 302.7013 dec= -45.3308 mag=18.38 sep=17.13".
This paragraph is only useful if the XRT position is grossly wrong. There are 1
candidate(s) in the image data with mag < 18.33 inside the BAT error region,
but outside the XRT error region. The brightest such source is at RA=302.67491
(20:10:41.98), DEC=-45.33271 (-45:19:57.8) (J2000). It has a mag of 18.18. It
is 88.8" from the BAT position.
****THIS SOURCE IS OUTSIDE XRT ERROR CIRCLE--USE WITH CAUTION***
UVOT took a finding chart exposure of 68 seconds with the U filter starting
307 seconds after the BAT trigger. There is a candidate afterglow in the
rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 20:10:41.98 = 302.67491
DEC(J2000) = -45:19:57.8 = -45.33271
with a 90%-confidence error radius of about 0.93 arc sec. The estimated
magnitude is 18.18 with a 1-sigma error of about 0.23. 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?
613629909 306 U srclist found no candidates.
613629909 306 U image found no candidates.
List afterglow candidates for other finding charts.
613629697 94 WHITE srclist found no candidates.
613629697 94 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: SRCLIST
FILTER: u
GRB_DEC: -45.33550
GRB_ERROR: 5
GRB_RA: 302.70204
IMAGE_START_TIME: 04:45:04
MAGNITUDE: 18.0
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT