image overlap message for exposure 1 of trigger 1002158
uvot_overlap.pl vrs. 2010-12-20b fem started at 201027d11h16m15s279591usUT
The observation of trigger 1002158 started 2020-10-27T01:09:36.7
Examining file ./1002158_g111_uvot_sky_image.fits
The exposure ID is 625453776
The exposure time is 149.868 (seconds)
The filter is WHITE.
The uvot region is centered at (155.9829,-5.5152) with a roll angle of 101.9
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 (155.9740,-5.5150) with a radius of 3.000 arc min
This is 0.534 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 (155.9698,-5.5100) with a radius of 0.030 arc min
This is 0.847 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 1002158
find_uvot_ag.pl vrs. 2017-02-17 fem started at 201027d11h16m20s153531usUT
Observation start time is 2020-10-27T01:09:36.7
Examining file ./1002158_g111_uvot_catalog_image.fits
The exposure ID is 625453776
The exposure is 149.868 sec.
The bin size is 2 pixels
The filter is WHITE
There are 5 detected source(s) for 1002158_g111
Aspect correction adds 0.00145 degrees (0.348 sec of time = 5.19 arc sec) to RA
Aspect correction adds -0.00082 degrees (-2.94 arcsec) to Dec
Total aspect correction is 5.97 arcsec
Star catalogs centered at 155.9807 , -5.5163 with radius 2.42 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 5 matched entries is 0.283" for 1002158_g111
Mean and std. dev of mag. difference (MAG_DELTA) are 1.222 and 0.148 for 1002158_g111
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 1002158_g111.
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=155.9740 (10:23:53.76) DEC=-5.5150 (-05:30:54.0)
XRT distances are from RA=155.9698 (10:23:52.74) DEC=-5.5100 (-05:30:36.1)
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
There are 1.2334989E+05 counts in the bkg source region of 6088.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 20.261 counts/pixel (5-sig UL in 4" is 19.72 mag) for 1002158_g111
There are 3872.1145 counts in the xrt source region of 199.00000 pixels.
Rate in xrt region with 8 arcsec radius is 19.458 counts/pixel for 1002158_g111
There are 25205.809 counts in the xrt_bkg source region of 1247.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 20.213 counts/pixel (5-sig UL in 4" is 19.72 mag) for 1002158_g111
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 20.27, 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: 1002158_625453776_201027d11h16m20s153531usUT_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(155.9829,-5.5152,45")
fk5;-circle(155.973401782376,-5.5210839824287,6")
fk5;-circle(155.989741603738,-5.51913797357398,6")
Region file: 1002158_625453776_201027d11h16m20s153531usUT_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(155.96975,-5.51003,8")
Region file: 1002158_625453776_201027d11h16m20s153531usUT_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(155.96975,-5.51003,25")
fk5;-circle(155.96975,-5.51003,15")
image paragraph message for exposure 1 of trigger 1002158
------ Start for Possible Stand-alone Circular ----
In response to GRB201027 (Swift/BAT trigger 1002158) at 01:07:44 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 86 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
0.04.
------- notes for trigger 1002158 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 201027d11h16m24s603212usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=1002158
-expid=625453776 -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/1002158/
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 625453776.7251 or about 2020:301:01:09:31 UT
There was likely a PROBLEM with the srclist star catalog because no stars
found. Found 27 sources in srclist catalog. Found 4 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 5 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 20.27 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 123349.9 counts in the large background region of 6088.0 pixels or a rate
of 20.261 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 19.72 mag. for a
4-arcsec aperture.
Found 3872.1 counts in the XRT position region of 199.0 pixels or a rate of
19.458 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is -1.002 +/- 0.448 (1-sigma) cps. The
3-sigma UL at the XRT position is 1.344 cps or 19.46 mag. The closest srclist
source has ra= 155.9733 dec= -5.5211 mag=18.71 sep=41.85". The closest Genie
source has ra= 155.9734 dec= -5.5211 mag=18.31 sep=41.89".
This paragraph is only useful if the XRT position is grossly wrong. There are 1
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=156.01526
(10:24:03.66), DEC=-5.49945 (-05:29:58.0) (J2000). It has a mag of 18.34. It is
158.1" 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 86 seconds after the BAT trigger. There is a candidate afterglow in
the list of sources generated on-board at
RA(J2000) = 10:24:03.66 = 156.01526
DEC(J2000) = -05:29:58.0 = -5.49945
with a 90%-confidence error radius of about 1.10 arc sec. The estimated
magnitude is 18.34 with a 1-sigma error of about 0.35. No correction has been
made for the expected extinction corresponding to E(B-V) of 0.04.
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?
625453776 85 WHITE srclist found no candidates.
625453776 85 WHITE image found no candidates.
List afterglow candidates for other finding charts.
625453988 297 U srclist found no candidates.
625453988 297 U image found no candidates.
625454569 878 WHITE srclist found no candidates.
625454569 878 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: -5.51003
GRB_ERROR: 5
GRB_RA: 155.96975
IMAGE_START_TIME: 01:09:31
MAGNITUDE: 19.5
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT