image overlap message for exposure 1 of trigger 994143
uvot_overlap.pl vrs. 2010-12-20b fem started at 200901d18h11m59s240415usUT
The observation of trigger 994143 started 2020-09-01T04:38:49.8
Examining file ./994143_g3077_uvot_sky_image.fits
The exposure ID is 620627929
The exposure time is 149.846 (seconds)
The filter is WHITE.
The uvot region is centered at (61.7692,-59.8783) with a roll angle of 93.8
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 (61.7580,-59.8800) with a radius of 3.000 arc min
This is 0.352 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 (61.7832,-59.8908) with a radius of 0.030 arc min
This is 0.861 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 994143
find_uvot_ag.pl vrs. 2017-02-17 fem started at 200901d18h12m29s079936usUT
Observation start time is 2020-09-01T04:38:49.8
Examining file ./994143_g3077_uvot_catalog_image.fits
The exposure ID is 620627929
The exposure is 149.846 sec.
The bin size is 2 pixels
The filter is WHITE
There are 7 detected source(s) for 994143_g3077
Aspect correction adds 0.00118 degrees (0.283 sec of time = 2.13 arc sec) to RA
Aspect correction adds -0.00032 degrees (-1.14 arcsec) to Dec
Total aspect correction is 2.42 arcsec
Star catalogs centered at 61.7707 , -59.8797 with radius 2.40 arc min.
n_usno: 40 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 6 matched entries is 0.472" for 994143_g3077
Mean and std. dev of mag. difference (MAG_DELTA) are 0.876 and 0.410 for 994143_g3077
Found 2 entries without IDs and 2 entries that are acceptable afterglow candidates for 994143_g3077.
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=61.7580 (04:07:01.92) DEC=-59.8800 (-59:52:48.0)
XRT distances are from RA=61.7832 (04:07:07.97) DEC=-59.8908 (-59:53:27.0)
*** WARNING 28 per cent of entries have no IDs.
-----------------
Entry 3 in the list of sources is a candidate afterglow for 994143_g3077 with genie
ra=61.73142 (04:06:55.54) dec=-59.86834 (-59:52:06.0) +/- 0.6" mag=19.37+/-0.16
dist=123.8 REFID=3 major=0.9 minor=0.5 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 63.8 arc sec from the BAT position.
This source is near the edge of image (0.965)
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
61.7304 -59.8682 2.0 -1 USNO-B1 17.04 16.27 16.61 *
61.7339 -59.8654 11.4 -1 USNO-B1 21.48 19.73 20.50
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 5.25" or brighter than 12 mag
-----------------
Entry 4 in the list of sources is a candidate afterglow for 994143_g3077 with genie
ra=61.79092 (04:07:09.82) dec=-59.89005 (-59:53:24.2) +/- 1.3" mag=21.72+/-0.40
dist=14.2 REFID=7 major=1.1 minor=0.8 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 69.6 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
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
There are 33024.324 counts in the bkg source region of 6105.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 5.409 counts/pixel (5-sig UL in 4" is 20.43 mag) for 994143_g3077
There are 1178.8613 counts in the xrt source region of 203.00000 pixels.
Rate in xrt region with 8 arcsec radius is 5.807 counts/pixel for 994143_g3077
There are 6476.8906 counts in the xrt_bkg source region of 1176.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 5.508 counts/pixel (5-sig UL in 4" is 20.42 mag) for 994143_g3077
Good candidates have no ID, acceptable profiles,
mag between 9.01 and 20.99, 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: 994143_620627929_200901d18h12m29s079936usUT_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(61.7692,-59.8783,45")
fk5;-circle(61.7646962216415,-59.8748835432878,6")
fk5;-circle(61.7699393343303,-59.8741670301571,6")
Region file: 994143_620627929_200901d18h12m29s079936usUT_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(61.78321,-59.89083,8")
Region file: 994143_620627929_200901d18h12m29s079936usUT_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(61.78321,-59.89083,25")
fk5;-circle(61.78321,-59.89083,15")
fk5;-circle(61.7909242271296,-59.8900470123796,6")
fk5;-circle(61.7818612194429,-59.8984626532203,6")
image paragraph message for exposure 1 of trigger 994143
------ Start for Possible Stand-alone Circular ----
In response to GRB200901 (Swift/BAT trigger 994143) at 03:47:31 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 3052 seconds after the BAT trigger. No credible afterglow candidate
has been found in the initial data products. The 2.7'x2.7' sub-image covers
100% of the XRT error circle. The typical 3-sigma upper limit has been about
19.6 mag. 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 mag. No correction has been made for the expected extinction
corresponding to E(B-V) of 0.02.
------- notes for trigger 994143 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 200901d18h12m35s936582usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=994143
-expid=620627929 -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/994143/
Links to data for all triggers can be found at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/
XRT position found for srclist. XRT position found for Genie image. BAT
position found.
UVOT exposure began at MET 620627929.77738 or about 2020:245:04:38:44 UT
Found 471 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 8% of the srclist region. Found 28 sources in
srclist catalog. Found 4 srclist source(s) without IDs. There are 0 good
candidate(s) in the srclist catalog. Good candidates must be brighter than
19.22 mag.
Found 7 source(s) in Genie image catalog. Found 2 Genie image source(s) without
IDs. There are 0 good candidate(s) in the Genie image catalog. Good candidates
must be brighter than 20.99 mag. Found 36 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 4% of the
Genie image region.
Genie image analysis:
Found 33024.3 counts in the large background region of 6105.0 pixels or a rate
of 5.409 counts/pixel in a radius of 45.0 arcsec. Based on this background, the
typical 5-sigma UL at a random point in the Genie image is 20.43 mag. for a
4-arcsec aperture.
Found 1178.9 counts in the XRT position region of 203.0 pixels or a rate of
5.807 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 0.406 +/- 0.247 (1-sigma) cps or
20.76 mag and a range from 20.24 to 21.78 mag. The 3-sigma UL at the XRT
position is 1.147 cps or 19.63 mag. The closest srclist source has ra= 61.7818
dec= -59.8985 mag=18.22 sep=27.68". The closest Genie source has ra= 61.7909
dec= -59.8901 mag=21.72 sep=14.21".
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?
620627929 3051 WHITE srclist found no candidates.
620627929 3051 WHITE image found no candidates.
List afterglow candidates for other finding charts.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: -59.89083
GRB_ERROR: 5
GRB_RA: 61.78321
IMAGE_START_TIME: 04:38:44
MAGNITUDE: 19.6
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT