image overlap message for exposure 2 of trigger 1080859
uvot_overlap.pl vrs. 2010-12-20b fem started at 211024d06h46m01s212780usUT
The observation of trigger 1080859 started 2021-10-23T21:11:30.4
Examining file ./1080859_g337_uvot_sky_image.fits
The exposure ID is 656716290
The exposure time is 249.935 (seconds)
The filter is U.
The uvot region is centered at (170.3075,39.1350) with a roll angle of 136.6
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 (170.3020,39.1370) with a radius of 3.000 arc min
This is 0.286 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 (170.3087,39.1353) with a radius of 0.045 arc min
This is 0.059 arc min from the center of the uvot region
The area of the XRT error circle is 0.006 sq. arc min
The UVOT/XRT overlap is 0.006 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 2 of trigger 1080859
find_uvot_ag.pl vrs. 2020-10-30 fem started at 211024d06h46m12s086971usUT
Observation start time is 2021-10-23T21:11:30.4
Examining file ./1080859_g337_uvot_catalog_image.fits
The exposure ID is 656716290
The exposure is 249.935 sec.
The bin size is 2 pixels
The filter is U
There are 3 detected source(s) for 1080859_g337
Aspect correction adds -0.00004 degrees (-0.010 sec of time = -0.12 arc sec) to RA
Aspect correction adds -0.00074 degrees (-2.66 arcsec) to Dec
Total aspect correction is 2.66 arcsec
Star catalogs centered at 170.2949 , 39.1361 with radius 2.08 arc min.
n_usno: 23 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 2 matched entries is 0.413" for 1080859_g337
Mean and std. dev of mag. difference (MAG_DELTA) are 0.979 and 1.192 for 1080859_g337
Found 1 entries without IDs and 1 entries that are acceptable afterglow candidates for 1080859_g337.
Acceptable entries have no ID, XRT distances < 6.75", 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=170.3020 (11:21:12.48) DEC=39.1370 (+39:08:13.2)
XRT distances are from RA=170.3087 (11:21:14.09) DEC=39.1353 (+39:08:07.2)
*** WARNING 33 per cent of entries have no IDs.
-----------------
Entry 0 in the list of sources is a candidate afterglow for 1080859_g337 with genie
ra=170.30926 (11:21:14.22) dec=39.13573 (+39:08:08.6) +/- 0.9" mag=19.60+/-0.23
dist=2.1 REFID=3 major=1.6 minor=1.4 flag=0
Found 0 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)
*** unacceptable major profile of 1.6
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
Unmatched source ra=170.30926 (11:21:14.22) dec=39.13573 (+39:08:08.6) +/- 0.9" mag=19.60+/-0.23 dist=2.1 REFID=3 flag=0
There are 22987.746 counts in the bkg source region of 6084.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 3.778 counts/pixel (5-sig UL in 4" is 19.74 mag) for 1080859_g337
There are 890.21948 counts in the xrt source region of 201.00000 pixels.
Rate in xrt region with 8 arcsec radius is 4.429 counts/pixel for 1080859_g337
There are 4758.5015 counts in the xrt_bkg source region of 1250.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 3.807 counts/pixel (5-sig UL in 4" is 19.74 mag) for 1080859_g337
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 20.30, XRT distances < 6.75",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 1080859_656716290_211024d06h46m12s086971usUT_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(170.3075,39.1350,45")
fk5;-circle(170.309264927446,39.1357308287712,6")
fk5;-circle(170.301989658674,39.143731719608,6")
Region file: 1080859_656716290_211024d06h46m12s086971usUT_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(170.30871,39.13533,8")
Region file: 1080859_656716290_211024d06h46m12s086971usUT_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(170.30871,39.13533,25")
fk5;-circle(170.30871,39.13533,15")
image paragraph message for exposure 2 of trigger 1080859
1 source(s) near the XRT position were rejected as afterglow candidate(s). See
notes for details.
------ Start for Possible Stand-alone Circular ----
In response to GRB211023 (Swift/BAT trigger 1080859) at 21:05:52 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
310 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
0.024.
------- notes for trigger 1080859 ------
uvot_gcn_auto.pl vrs. 2020-10-27 fem at 211024d06h46m15s490759usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1080859
-expid=656716290 -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/1080859/
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 656716290.39956 or about 2021:296:21:11:25 UT
Found 396 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 3% of the srclist region. Found 32 sources in
srclist catalog. Found 9 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 3 source(s) in Genie image catalog. 1 source(s) are within 10.0" of the
xrt position. Found 1 Genie image source(s) without IDs. There are 0 good
candidate(s) in the Genie image catalog. Good candidates must be brighter than
20.30 mag. Found 19 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 3% of the Genie image region.
Genie image analysis:
Found 22987.7 counts in the large background region of 6084.0 pixels or a rate
of 3.778 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 19.59 mag. for a
4-arcsec aperture.
Found 890.2 counts in the XRT position region of 201.0 pixels or a rate of
4.429 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 0.500 +/- 0.127 (1-sigma) cps or
18.93 mag and a range from 18.69 to 19.25 mag. The 3-sigma UL at the XRT
position is 0.882 cps or 18.32 mag. The closest srclist source has ra= 170.3118
dec= 39.1658 mag=19.91 sep=110.17".
Found 1 Genie source(s) within 10.0" of the XRT position. The brightest such
source has ra= 170.3093 dec= 39.1357 mag=19.60 sep=2.12". The closest Genie
source has ra= 170.3093 dec= 39.1357 mag=19.60 sep=2.12".
Report rejected UVOT sources within 10 arcsec XRT position.
Such sources are usually NOT the afterglow.
****THIS SOURCE NEAR XRT POSITION WAS REJECTED--USE WITH CAUTION****
UVOT took a finding chart exposure of 250 seconds with the U filter starting
310 seconds after the BAT trigger. There is a candidate afterglow in the
rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 11:21:14.22 = 170.30926
DEC(J2000) = +39:08:08.6 = 39.13573
with a 90%-confidence error radius of about 0.92 arc sec. This position is 2.12
arc sec. from the center of the XRT error circle. The estimated magnitude is
19.60 with a 1-sigma error of about 0.23. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.024.
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?
656716290 309 U srclist found no candidates.
656716290 309 U image found no candidates.
List afterglow candidates for other finding charts.
656716077 96 WHITE srclist found no candidates.
656716077 96 WHITE 170.30963 39.13578 19.32/20.4 3.0 image Yes
656716843 862 WHITE srclist found no candidates.
656716843 862 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: 39.13533
GRB_ERROR: 6.75
GRB_RA: 170.30871
IMAGE_START_TIME: 21:11:25
MAGNITUDE: 18.3
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT