image overlap message for exposure 2 of trigger 1131397
uvot_overlap.pl vrs. 2010-12-20b fem started at 221027d23h19m15s377398usUT
The observation of trigger 1131397 started 2022-10-27T19:19:52.2
Examining file ./1131397_g373_uvot_sky_image.fits
The exposure ID is 688591192
The exposure time is 249.935 (seconds)
The filter is U.
The uvot region is centered at (225.6049,47.4420) with a roll angle of 195.0
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 (225.6030,47.4480) with a radius of 3.000 arc min
This is 0.367 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 (225.6210,47.4421) with a radius of 0.037 arc min
This is 0.652 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 1131397
find_uvot_ag.pl vrs. 2020-10-30 fem started at 221027d23h19m25s093510usUT
Observation start time is 2022-10-27T19:19:52.2
Examining file ./1131397_g373_uvot_catalog_image.fits
The exposure ID is 688591192
The exposure is 249.935 sec.
The bin size is 2 pixels
The filter is U
There are 2 detected source(s) for 1131397_g373
Aspect correction adds 0.00022 degrees (0.054 sec of time = 0.55 arc sec) to RA
Aspect correction adds -0.00137 degrees (-4.92 arcsec) to Dec
Total aspect correction is 4.95 arcsec
Star catalogs centered at 225.6050 , 47.4437 with radius 2.18 arc min.
n_usno: 69 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 2 matched entries is 0.409" for 1131397_g373
Mean and std. dev of mag. difference (MAG_DELTA) are 0.548 and 0.219 for 1131397_g373
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 1131397_g373.
Acceptable entries have no ID, XRT distances < 5.5", 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=225.6030 (15:02:24.72) DEC=47.4480 (+47:26:52.8)
XRT distances are from RA=225.6210 (15:02:29.03) DEC=47.4421 (+47:26:31.4)
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
There are 16660.910 counts in the bkg source region of 6210.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 2.683 counts/pixel (5-sig UL in 4" is 19.93 mag) for 1131397_g373
There are 559.58380 counts in the xrt source region of 201.00000 pixels.
Rate in xrt region with 8 arcsec radius is 2.784 counts/pixel for 1131397_g373
There are 3408.8960 counts in the xrt_bkg source region of 1249.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 2.729 counts/pixel (5-sig UL in 4" is 19.92 mag) for 1131397_g373
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 20.48, XRT distances < 5.5",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 1131397_688591192_221027d23h19m25s093510usUT_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(225.6049,47.4420,45")
fk5;-circle(225.598639475431,47.4477070244764,6")
Region file: 1131397_688591192_221027d23h19m25s093510usUT_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(225.62096,47.44206,8")
Region file: 1131397_688591192_221027d23h19m25s093510usUT_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(225.62096,47.44206,25")
fk5;-circle(225.62096,47.44206,15")
image paragraph message for exposure 2 of trigger 1131397
------ Start for Possible Stand-alone Circular ----
In response to GRB221027 (Swift/BAT trigger 1131397) at 19:13:38 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
343 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
0.033.
------- notes for trigger 1131397 ------
uvot_gcn_auto.pl vrs. 2020-10-27 fem at 221027d23h19m28s528593usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1131397
-expid=688591192 -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/1131397/
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 688591192.18168 or about 2022:300:19:19:47 UT
Found 636 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 6% of the srclist region. Found 59 sources in
srclist catalog. Found 19 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 2 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 20.48 mag. Found 65 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 9% of the
Genie image region.
Genie image analysis:
Found 16660.9 counts in the large background region of 6210.0 pixels or a rate
of 2.683 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 19.76 mag. for a
4-arcsec aperture.
Found 559.6 counts in the XRT position region of 201.0 pixels or a rate of
2.784 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 0.044 +/- 0.102 (1-sigma) cps or
21.56 mag and a range from 20.26 to 99.99 mag. The 3-sigma UL at the XRT
position is 0.349 cps or 19.31 mag. The closest srclist source has ra= 225.6399
dec= 47.4069 mag=19.29 sep=134.78". The closest Genie source has ra= 225.5986
dec= 47.4477 mag=19.58 sep=58.02".
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?
688591192 343 U srclist found no candidates.
688591192 343 U image found no candidates.
List afterglow candidates for other finding charts.
688590979 130 WHITE srclist found no candidates.
688590979 130 WHITE image found no candidates.
688591721 872 WHITE srclist found no candidates.
688591721 872 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: 47.44206
GRB_ERROR: 5.5
GRB_RA: 225.62096
IMAGE_START_TIME: 19:19:47
MAGNITUDE: 19.3
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT