image overlap message for exposure 1 of trigger 1015615
uvot_overlap.pl vrs. 2010-12-20b fem started at 210102d01h47m38s712238usUT
The observation of trigger 1015615 started 2021-01-02T01:23:18.5
Examining file 1015615_g3965_uvot_sky_image.fits
The exposure ID is 631243398
The exposure time is 149.868 (seconds)
The filter is WHITE.
The uvot region is centered at (234.7460,-84.1859) with a roll angle of 50.1
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 (234.7030,-84.1890) with a radius of 3.000 arc min
This is 0.320 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
Could not find the location of an XRT error circle
image afterglow message for exposure 1 of trigger 1015615
find_uvot_ag.pl vrs. 2020-10-30 fem started at 210102d01h47m39s621816usUT
Observation start time is 2021-01-02T01:23:18.5
Examining file 1015615_g3965_uvot_catalog_image.fits
The exposure ID is 631243398
The exposure is 149.868 sec.
The bin size is 2 pixels
The filter is WHITE
There are 7 detected source(s) for 1015615_g3965
Aspect correction adds 0.00361 degrees (0.867 sec of time = 1.31 arc sec) to RA
Aspect correction adds -0.00053 degrees (-1.92 arcsec) to Dec
Total aspect correction is 2.33 arcsec
Star catalogs centered at 234.7176 , -84.1845 with radius 2.61 arc min.
n_usno: 105 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 7 matched entries is 0.343" for 1015615_g3965
Mean and std. dev of mag. difference (MAG_DELTA) are 1.250 and 0.169 for 1015615_g3965
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 1015615_g3965.
Acceptable entries have no ID, XRT distances < 10", 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=234.7030 (15:38:48.72) DEC=-84.1890 (-84:11:20.4)
XRT distances are as reported in catalog file.
List UVOT sources within 10" of the XRT position:
There are 2.4612442E+05 counts in the bkg source region of 6187.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 39.781 counts/pixel (5-sig UL in 4" is 19.35 mag) for 1015615_g3965
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 19.90, XRT distances < 10",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 1015615_631243398_210102d01h47m39s621816usUT_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(234.7460,-84.1859,45")
fk5;-circle(234.765076087516,-84.1878963139841,6")
fk5;-circle(234.615059572372,-84.184072743261,6")
image paragraph message for exposure 1 of trigger 1015615
THIS MESSAGE IS *NOT* READY FOR DISTRIBUTION.
MORE ANALYSIS IS REQUIRED TO DETERMINE WHETHER THERE IS AN AFTERGLOW CANDIDATE.
IMAGE PROBLEM: overlap undefined
SRCLIST PROBLEM: overlap is unknown
See notes for more details.
------ Start for Possible Stand-alone Circular ----
In response to GRB210102 (Swift/BAT trigger 1015615) at 00:17:12 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 3939 seconds after the BAT trigger. No credible afterglow candidate
has been found in the initial data products. The overlap of the sub-image and
the XRT error circle is uncertain. The overlap of the 8'x8' region for the list
of sources generated on-board and the XRT error circle is uncertain. No
correction has been made for the expected extinction corresponding to E(B-V) of
0.12.
------- notes for trigger 1015615 ------
uvot_gcn_auto.pl vrs. 2020-10-27 fem at 210102d01h47m41s150258usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1015615
-expid=631243398 -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/1015615/
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 631243398.51992 or about 2021:002:01:23:13 UT
Found 729 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 13% of the srclist region. Found 73 sources in
srclist catalog. Found 10 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 0 Genie image source(s) without
IDs. There are 0 good candidate(s) in the Genie image catalog. Good candidates
must be brighter than 19.90 mag. Found 101 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 10% of the
Genie image region. The closest srclist source has ra= 234.4957 dec= -84.2572
mag=18.92 sep=547.49". The closest Genie source has ra= 234.9062 dec= -84.2007
mag=17.29 sep=721.80".
This paragraph is only useful if the XRT position is grossly wrong. There are 2
candidate(s) in the srclist data with mag < 18.66 inside the BAT error region,
but outside the XRT error region. The brightest such source is at RA=234.78197
(15:39:07.67), DEC=-84.14019 (-84:08:24.7) (J2000). It has a mag of 13.86. It
is 178.1" from the BAT position.
****THIS SOURCE IS OUTSIDE XRT ERROR CIRCLE--USE WITH CAUTION***
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 3939 seconds after the BAT trigger. There is a candidate afterglow in
the list of sources generated on-board at
RA(J2000) = 15:39:07.67 = 234.78197
DEC(J2000) = -84:08:24.7 = -84.14019
with a 90%-confidence error radius of about 1.10 arc sec. The estimated
magnitude is 13.86 with a 1-sigma error of about 0.35. No correction has been
made for the expected extinction corresponding to E(B-V) of 0.12.
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?
631243398 3939 WHITE srclist found no candidates.
631243398 3939 WHITE image found no candidates.
List afterglow candidates for other finding charts.
------- Tokens for Quick GCN -------