image overlap message for exposure 1 of trigger 1002103
uvot_overlap.pl vrs. 2010-12-20b fem started at 201027d09h22m56s729806usUT
The observation of trigger 1002103 started 2020-10-26T22:39:27.9
Examining file ./1002103_g112_uvot_sky_image.fits
The exposure ID is 625444767
The exposure time is 149.868 (seconds)
The filter is WHITE.
The uvot region is centered at (196.7555,83.7780) with a roll angle of 165.3
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 (196.6640,83.7610) with a radius of 3.000 arc min
This is 1.182 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 (196.7466,83.7819) with a radius of 0.032 arc min
This is 0.242 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 1002103
find_uvot_ag.pl vrs. 2017-02-17 fem started at 201027d09h23m03s628172usUT
Observation start time is 2020-10-26T22:39:27.9
Examining file ./1002103_g112_uvot_catalog_image.fits
The exposure ID is 625444767
The exposure is 149.868 sec.
The bin size is 2 pixels
The filter is WHITE
There are 7 detected source(s) for 1002103_g112
Aspect correction adds 0.01863 degrees (4.472 sec of time = 7.31 arc sec) to RA
Aspect correction adds -0.00267 degrees (-9.62 arcsec) to Dec
Total aspect correction is 12.08 arcsec
Star catalogs centered at 196.8057 , 83.7830 with radius 2.40 arc min.
n_usno: 0 n_gsc: 0
*** WARNING -- no star catalog entries found.
-- this strongly suggests a problem with the catalogs.
-- cannot check for bright stars or nearby sources.
-- there is a high risk of false positives.
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 6 matched entries is 0.342" for 1002103_g112
Mean and std. dev of mag. difference (MAG_DELTA) are 1.299 and 0.203 for 1002103_g112
Found 1 entries without IDs and 1 entries that are acceptable afterglow candidates for 1002103_g112.
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=196.6640 (13:06:39.36) DEC=83.7610 (+83:45:39.6)
XRT distances are from RA=196.7466 (13:06:59.19) DEC=83.7819 (+83:46:55.0)
-----------------
Entry 6 in the list of sources is a candidate afterglow for 1002103_g112 with genie
ra=196.98922 (13:07:57.41) dec=83.78822 (+83:47:17.6) +/- 0.8" mag=20.39+/-0.22
dist=97.2 REFID=5 major=0.8 minor=0.6 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 160.4 arc sec from the BAT position.
This source is near the edge of image (0.982)
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)
*** 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 58587.055 counts in the bkg source region of 6237.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 9.393 counts/pixel (5-sig UL in 4" is 20.13 mag) for 1002103_g112
There are 1949.6283 counts in the xrt source region of 208.00000 pixels.
Rate in xrt region with 8 arcsec radius is 9.373 counts/pixel for 1002103_g112
There are 11823.771 counts in the xrt_bkg source region of 1252.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 9.444 counts/pixel (5-sig UL in 4" is 20.13 mag) for 1002103_g112
Good candidates have no ID, acceptable profiles,
mag between 9.01 and 20.69, 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: 1002103_625444767_201027d09h23m03s628172usUT_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(196.7555,83.7780,45")
fk5;-circle(196.639488475262,83.7786964928299,6")
fk5;-circle(196.882639035579,83.7762152529291,6")
fk5;-circle(196.796998744837,83.7654037204123,6")
Region file: 1002103_625444767_201027d09h23m03s628172usUT_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(196.74662,83.78194,8")
Region file: 1002103_625444767_201027d09h23m03s628172usUT_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(196.74662,83.78194,25")
fk5;-circle(196.74662,83.78194,15")
image paragraph message for exposure 1 of trigger 1002103
------ Start for Possible Stand-alone Circular ----
In response to GRB201026 (Swift/BAT trigger 1002103) at 22:37:34 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 87 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
0.18.
------- notes for trigger 1002103 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 201027d09h23m16s045567usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1002103
-expid=625444767 -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/1002103/
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 625444767.87186 or about 2020:300:22:39:22 UT
There was likely a PROBLEM with the srclist star catalog because no stars
found. Found 29 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 19.22 mag.
Found 7 source(s) in Genie image catalog. 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 20.69 mag. Found 0 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 0% of the
Genie image region.
Genie image analysis:
Found 58587.1 counts in the large background region of 6237.0 pixels or a rate
of 9.393 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 20.13 mag. for a
4-arcsec aperture.
Found 1949.6 counts in the XRT position region of 208.0 pixels or a rate of
9.373 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is -0.098 +/- 0.318 (1-sigma) cps. The
3-sigma UL at the XRT position is 0.954 cps or 19.83 mag. The closest srclist
source has ra= 196.6400 dec= 83.7787 mag=15.55 sep=43.18". The closest Genie
source has ra= 196.6395 dec= 83.7787 mag=14.80 sep=43.40".
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?
625444767 86 WHITE srclist found no candidates.
625444767 86 WHITE image found no candidates.
List afterglow candidates for other finding charts.
625444980 299 U srclist found no candidates.
625444980 299 ? image data are not available.
625445559 878 ? srclist data are not available.
625445559 878 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: 83.78194
GRB_ERROR: 5
GRB_RA: 196.74662
IMAGE_START_TIME: 22:39:22
MAGNITUDE: 19.8
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT