image overlap message for exposure 3 of trigger 958592
uvot_overlap.pl vrs. 2010-12-20b fem started at 200227d07h59m43s822527usUT
The observation of trigger 958592 started 2020-02-27T07:34:53.5
Examining file ./958592_g884_uvot_sky_image.fits
The exposure ID is 604481693
The exposure time is 149.857 (seconds)
The filter is WHITE.
The uvot region is centered at (56.4296,9.4796) 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 0.778 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 0.259 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 3 of trigger 958592
find_uvot_ag.pl vrs. 2017-02-17 fem started at 200227d07h59m57s961631usUT
Observation start time is 2020-02-27T07:34:53.5
Examining file ./958592_g884_uvot_catalog_image.fits
The exposure ID is 604481693
The exposure is 149.857 sec.
The bin size is 2 pixels
The filter is WHITE
There are 1 detected source(s) for 958592_g884
Aspect correction adds -0.00117 degrees (-0.281 sec of time = -4.16 arc sec) to RA
Aspect correction adds 0.00043 degrees ( 1.55 arcsec) to Dec
Total aspect correction is 4.43 arcsec
Star catalogs centered at 56.4378 , 9.4652 with radius 2.00 arc min.
n_usno: 27 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 2 matched entries is 0.896" for 958592_g884
Mean and std. dev of mag. difference (MAG_DELTA) are 1.661 and 0.367 for 958592_g884
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 958592_g884.
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 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
There are 95670.508 counts in the bkg source region of 6280.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 15.234 counts/pixel (5-sig UL in 4" is 19.87 mag) for 958592_g884
There are 3005.6255 counts in the xrt source region of 197.00000 pixels.
Rate in xrt region with 8 arcsec radius is 15.257 counts/pixel for 958592_g884
There are 18945.828 counts in the xrt_bkg source region of 1250.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 15.157 counts/pixel (5-sig UL in 4" is 19.87 mag) for 958592_g884
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 20.43, XRT distances < 8.75",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 958592_604481693_200227d07h59m57s961631usUT_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(56.4296,9.4796,45")
fk5;-circle(56.4317716461763,9.46693916018155,6")
Region file: 958592_604481693_200227d07h59m57s961631usUT_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_604481693_200227d07h59m57s961631usUT_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 3 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 150 seconds with the White filter
starting 861 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
0.27.
------- notes for trigger 958592 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 200227d08h00m00s871228usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=958592
-expid=604481693 -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 604481693.50132 or about 2020:058:07:34:48 UT
Found 407 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 4% of the srclist region. Found 70 sources in
srclist catalog. Found 24 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 1 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 20.43 mag. Found 23 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 3% of the
Genie image region.
Genie image analysis:
Found 95670.5 counts in the large background region of 6280.0 pixels or a rate
of 15.234 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 19.87 mag. for a
4-arcsec aperture.
Found 3005.6 counts in the XRT position region of 197.0 pixels or a rate of
15.257 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 0.132 +/- 0.393 (1-sigma) cps or
21.98 mag and a range from 20.48 to 99.99 mag. The 3-sigma UL at the XRT
position is 1.311 cps or 19.49 mag. The closest srclist source has ra= 56.4453
dec= 9.4992 mag=19.84 sep=74.76". The closest Genie source has ra= 56.4318
dec= 9.4669 mag=20.33 sep=55.50".
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?
604481693 860 WHITE srclist found no candidates.
604481693 860 WHITE 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.
604481137 304 U srclist found no candidates.
604481137 304 U image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: 9.48230
GRB_ERROR: 8.75
GRB_RA: 56.43310
IMAGE_START_TIME: 07:34:48
MAGNITUDE: 19.5
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT