image overlap message for exposure 1 of trigger 1062336
uvot_overlap.pl vrs. 2010-12-20b fem started at 210801d17h27m07s065843usUT
The observation of trigger 1062336 started 2021-07-31T22:25:06.4
Examining file ./1062336_g237_uvot_sky_image.fits
The exposure ID is 649463106
The exposure time is 62.729 (seconds)
The filter is WHITE.
The uvot region is centered at (300.3027,-28.0638) with a roll angle of 227.7
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 (300.3140,-28.0420) with a radius of 3.000 arc min
This is 1.438 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 7.06 sq. arc min or 0.25 of the BAT error circle
The XRT error circle is centered at (300.3047,-28.0609) with a radius of 0.037 arc min
This is 0.201 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 1 of trigger 1062336
find_uvot_ag.pl vrs. 2020-10-30 fem started at 210801d17h27m11s699246usUT
Observation start time is 2021-07-31T22:25:06.4
Examining file ./1062336_g237_uvot_catalog_image.fits
The exposure ID is 649463106
The exposure is 62.729 sec.
The bin size is 2 pixels
The filter is WHITE
There are 18 detected source(s) for 1062336_g237
Aspect correction adds 0.00007 degrees (0.016 sec of time = 0.21 arc sec) to RA
Aspect correction adds -0.00108 degrees (-3.88 arcsec) to Dec
Total aspect correction is 3.89 arcsec
Star catalogs centered at 300.2991 , -28.0640 with radius 2.54 arc min.
n_usno: 125 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 18 matched entries is 0.373" for 1062336_g237
Mean and std. dev of mag. difference (MAG_DELTA) are 0.934 and 0.366 for 1062336_g237
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 1062336_g237.
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=300.3140 (20:01:15.36) DEC=-28.0420 (-28:02:31.2)
XRT distances are from RA=300.3047 (20:01:13.12) DEC=-28.0609 (-28:03:39.4)
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
There are 29100.863 counts in the bkg source region of 5620.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 5.178 counts/pixel (5-sig UL in 4" is 19.51 mag) for 1062336_g237
There are 1099.0270 counts in the xrt source region of 199.00000 pixels.
Rate in xrt region with 8 arcsec radius is 5.523 counts/pixel for 1062336_g237
There are 6337.8501 counts in the xrt_bkg source region of 1233.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 5.140 counts/pixel (5-sig UL in 4" is 19.52 mag) for 1062336_g237
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 20.07, 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: 1062336_649463106_210801d17h27m11s699246usUT_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(300.3027,-28.0638,45")
fk5;-circle(300.304014263195,-28.0637505322054,6")
fk5;-circle(300.295523273023,-28.0619511912632,6")
fk5;-circle(300.299702572001,-28.0510283457532,6")
fk5;-circle(300.305380748659,-28.0698555180593,6")
fk5;-circle(300.301088833469,-28.070920127894,6")
fk5;-circle(300.290309481456,-28.0586654764508,6")
fk5;-circle(300.306164929848,-28.07345536178,6")
fk5;-circle(300.289465865797,-28.0702079604268,6")
Region file: 1062336_649463106_210801d17h27m11s699246usUT_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(300.30467,-28.06094,8")
Region file: 1062336_649463106_210801d17h27m11s699246usUT_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(300.30467,-28.06094,25")
fk5;-circle(300.30467,-28.06094,15")
fk5;-circle(300.304014263195,-28.0637505322054,6")
fk5;-circle(300.295523273023,-28.0619511912632,6")
image paragraph message for exposure 1 of trigger 1062336
------ Start for Possible Stand-alone Circular ----
In response to GRB210731 (Swift/BAT trigger 1062336) at 22:21:08 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 63 seconds with the White filter
starting 210 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
0.092.
------- notes for trigger 1062336 ------
uvot_gcn_auto.pl vrs. 2020-10-27 fem at 210801d17h27m17s267155usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1062336
-expid=649463106 -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/1062336/
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 649463106.36476 or about 2021:212:22:25:01 UT
Found 754 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 13% of the srclist region. Found 84 sources in
srclist catalog. Found 1 srclist source(s) without IDs. There are 0 good
candidate(s) in the srclist catalog. Good candidates must be brighter than
18.75 mag.
Found 18 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 20.07 mag. Found 121 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
13% of the Genie image region.
Genie image analysis:
Found 29100.9 counts in the large background region of 5620.0 pixels or a rate
of 5.178 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 19.34 mag. for a
4-arcsec aperture.
Found 1099.0 counts in the XRT position region of 199.0 pixels or a rate of
5.523 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 1.208 +/- 0.564 (1-sigma) cps or
19.40 mag and a range from 18.98 to 20.08 mag. The 3-sigma UL at the XRT
position is 2.901 cps or 18.45 mag.
Found 1 srclist source(s) within 10.0" of the XRT position.
The brightest such source has ra= 300.3041 dec= -28.0636 mag=17.93 sep=9.93".
The closest srclist source has ra= 300.3041 dec= -28.0636 mag=17.93 sep=9.93".
The closest Genie source has ra= 300.3040 dec= -28.0637 mag=16.68 sep=10.33".
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 63 seconds with the White filter
starting 210 seconds after the BAT trigger. There is a candidate afterglow in
the list of sources generated on-board at
RA(J2000) = 20:01:12.97 = 300.30406
DEC(J2000) = -28:03:49.1 = -28.06364
with a 90%-confidence error radius of about 1.10 arc sec. This position is 9.93
arc sec. from the center of the XRT error circle. The estimated magnitude is
17.93 with a 1-sigma error of about 0.35. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.092.
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?
649463106 210 WHITE srclist found no candidates.
649463106 210 WHITE image found no candidates.
List afterglow candidates for other finding charts.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: -28.06094
GRB_ERROR: 5.5
GRB_RA: 300.30467
IMAGE_START_TIME: 22:25:01
MAGNITUDE: 18.4
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT