image overlap message for exposure 2 of trigger 998907
uvot_overlap.pl vrs. 2010-12-20b fem started at 201006d09h21m57s435629usUT
The observation of trigger 998907 started 2020-10-06T01:23:17.5
Examining file ./998907_g324_uvot_sky_image.fits
The exposure ID is 623640197
The exposure time is 249.946 (seconds)
The filter is U.
The uvot region is centered at (61.8884,65.1531) with a roll angle of 54.3
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 (61.8800,65.1500) with a radius of 3.000 arc min
This is 0.281 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 (61.8927,65.1646) with a radius of 0.035 arc min
This is 0.700 arc min from the center of the uvot region
The area of the XRT error circle is 0.004 sq. arc min
The UVOT/XRT overlap is 0.004 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 2 of trigger 998907
find_uvot_ag.pl vrs. 2017-02-17 fem started at 201006d09h22m38s666395usUT
Observation start time is 2020-10-06T01:23:17.5
Examining file ./998907_g324_uvot_catalog_image.fits
The exposure ID is 623640197
The exposure is 249.946 sec.
The bin size is 2 pixels
The filter is U
There are 1 detected source(s) for 998907_g324
Aspect correction adds 0.00343 degrees (0.824 sec of time = 5.19 arc sec) to RA
Aspect correction adds 0.00049 degrees ( 1.78 arcsec) to Dec
Total aspect correction is 5.48 arcsec
Star catalogs centered at 61.8848 , 65.1509 with radius 2.00 arc min.
n_usno: 68 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 1 matched entries is 0.255" for 998907_g324
Mean and std. dev of mag. difference (MAG_DELTA) are 1.743 and 0.000 for 998907_g324
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 998907_g324.
Acceptable entries have no ID, XRT distances < 5.25", 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=61.8800 (04:07:31.20) DEC=65.1500 (+65:09:00.0)
XRT distances are from RA=61.8927 (04:07:34.25) DEC=65.1646 (+65:09:52.6)
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
There are 12875.983 counts in the bkg source region of 6193.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 2.079 counts/pixel (5-sig UL in 4" is 20.07 mag) for 998907_g324
There are 408.95370 counts in the xrt source region of 202.00000 pixels.
Rate in xrt region with 8 arcsec radius is 2.025 counts/pixel for 998907_g324
There are 2569.0283 counts in the xrt_bkg source region of 1249.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 2.057 counts/pixel (5-sig UL in 4" is 20.07 mag) for 998907_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 20.62, XRT distances < 5.25",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 998907_623640197_201006d09h22m38s666395usUT_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(61.8884,65.1531,45")
fk5;-circle(61.9027453644338,65.1527263319447,6")
Region file: 998907_623640197_201006d09h22m38s666395usUT_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(61.89271,65.16461,8")
Region file: 998907_623640197_201006d09h22m38s666395usUT_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(61.89271,65.16461,25")
fk5;-circle(61.89271,65.16461,15")
image paragraph message for exposure 2 of trigger 998907
------ Start for Possible Stand-alone Circular ----
In response to GRB201006 (Swift/BAT trigger 998907) at 01:17:52 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 covers 100% of the
XRT error circle. The typical 3-sigma upper limit has been about 19.2 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 18.0 mag. No
correction has been made for the expected extinction corresponding to E(B-V) of
1.27.
------- notes for trigger 998907 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 201006d09h22m42s331537usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=998907
-expid=623640197 -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/998907/
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 623640197.45584 or about 2020:280:01:23:12 UT
Found 1069 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 11% of the srclist region. Found 27 sources in
srclist catalog. Found 5 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 1 source(s) in Genie image catalog. Found 0 Genie image source(s) without
IDs. There are 0 good candidate(s) in the Genie image catalog. Good candidates
must be brighter than 20.62 mag. Found 64 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 11% of the
Genie image region.
Genie image analysis:
Found 12876.0 counts in the large background region of 6193.0 pixels or a rate
of 2.079 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 20.11 mag. for a
4-arcsec aperture.
Found 409.0 counts in the XRT position region of 202.0 pixels or a rate of
2.025 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is -0.026 +/- 0.087 (1-sigma) cps. The
3-sigma UL at the XRT position is 0.262 cps or 19.83 mag. The closest srclist
source has ra= 61.9030 dec= 65.1527 mag=17.69 sep=45.62". The closest Genie
source has ra= 61.9027 dec= 65.1527 mag=17.05 sep=45.39".
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?
623640197 299 U srclist found no candidates.
623640197 299 U image found no candidates.
List afterglow candidates for other finding charts.
623639985 87 WHITE srclist found no candidates.
623639985 87 WHITE image found no candidates.
623640773 875 WHITE srclist found no candidates.
623640773 875 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: 65.16461
GRB_ERROR: 5.25
GRB_RA: 61.89271
IMAGE_START_TIME: 01:23:12
MAGNITUDE: 19.8
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT