image overlap message for exposure 2 of trigger 958592
uvot_overlap.pl vrs. 2010-12-20b fem started at 200227d07h59m43s054514usUT
The observation of trigger 958592 started 2020-02-27T07:25:37.7
Examining file ./958592_g328_uvot_sky_image.fits
The exposure ID is 604481137
The exposure time is 249.935 (seconds)
The filter is U.
The uvot region is centered at (56.4305,9.4793) with a roll angle of 259.2
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 (56.4360,9.4910) with a radius of 3.000 arc min
This is 0.776 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 (56.4331,9.4823) with a radius of 0.058 arc min
This is 0.239 arc min from the center of the uvot region
The area of the XRT error circle is 0.011 sq. arc min
The UVOT/XRT overlap is 0.011 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 2 of trigger 958592
find_uvot_ag.pl vrs. 2017-02-17 fem started at 200227d07h59m51s980167usUT
Observation start time is 2020-02-27T07:25:37.7
Examining file ./958592_g328_uvot_sources_image.fits
The exposure ID is 604481137
The exposure is 249.935 sec.
The bin size is 2 pixels
The filter is U
There are 0 detected source(s) for 958592_g328
*** WARNING -- Aspect solution FAILED.
Results need to be checked by, for example, blinking image with DS9.
Star catalogs centered at 56.4408 , 9.4846 with radius 2.00 arc min.
n_usno: 21 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 958592_g328.
Acceptable entries have no ID, XRT distances < 8.75", 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=56.4360 (03:45:44.64) DEC= 9.4910 (+09:29:27.6)
XRT distances are from RA=56.4331 (03:45:43.94) DEC= 9.4823 (+09:28:56.3)
Found 0 entries in star catalog(s) within 20" of the XRT position.
List UVOT sources within 20" of the XRT position:
There are 26505.176 counts in the bkg source region of 6307.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 4.203 counts/pixel (5-sig UL in 4" is 19.69 mag) for 958592_g328
There are 866.92865 counts in the xrt source region of 200.00000 pixels.
Rate in xrt region with 8 arcsec radius is 4.335 counts/pixel for 958592_g328
There are 5203.5962 counts in the xrt_bkg source region of 1248.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 4.170 counts/pixel (5-sig UL in 4" is 19.69 mag) for 958592_g328
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 20.24, XRT distances < 8.75",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Results are questionable because aspect solution FAILED.
Region file: 958592_604481137_200227d07h59m51s980167usUT_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(56.4305,9.4793,45")
Region file: 958592_604481137_200227d07h59m51s980167usUT_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(56.43310,9.48230,8")
Region file: 958592_604481137_200227d07h59m51s980167usUT_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(56.43310,9.48230,25")
fk5;-circle(56.43310,9.48230,15")
image paragraph message for exposure 2 of trigger 958592
------ Start for Possible Stand-alone Circular ----
In response to GRB200227 (Swift/BAT trigger 958592) at 07:20:08 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
305 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
0.27.
------- notes for trigger 958592 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 200227d07h59m55s224899usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=958592
-expid=604481137 -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/958592/
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 604481137.68494 or about 2020:058:07:25:32 UT
Found 143 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 3% of the srclist region. Found 8 sources in
srclist catalog. Found 0 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 0 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 20.24 mag. Found 17 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 2% of the
Genie image region.
Genie image analysis:
Found 26505.2 counts in the large background region of 6307.0 pixels or a rate
of 4.203 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 19.73 mag. for a
4-arcsec aperture.
Found 866.9 counts in the XRT position region of 200.0 pixels or a rate of
4.335 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 0.132 +/- 0.127 (1-sigma) cps or
20.58 mag and a range from 19.85 to 24.04 mag. The 3-sigma UL at the XRT
position is 0.512 cps or 19.11 mag. The closest srclist source has ra= 56.3981
dec= 9.4876 mag=17.75 sep=125.71".
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?
604481137 304 U srclist found no candidates.
604481137 304 U image found no candidates.
List afterglow candidates for other finding charts.
604480925 92 WHITE srclist found no candidates.
604480925 92 WHITE image found no candidates.
604481693 860 WHITE srclist found no candidates.
604481693 860 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: 9.48230
GRB_ERROR: 8.75
GRB_RA: 56.43310
IMAGE_START_TIME: 07:25:32
MAGNITUDE: 19.1
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT