image overlap message for exposure 2 of trigger 889785
uvot_overlap.pl vrs. 2010-12-20b fem started at 190220d15h15m52s302539usUT
The observation of trigger 889785 started 2019-02-20T03:04:55.8
Examining file ./889785_g320_uvot_sky_image.fits
The exposure ID is 572324695
The exposure time is 249.935 (seconds)
The filter is U.
The uvot region is centered at (330.1779,-76.6808) with a roll angle of 3.3
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 (330.1420,-76.6910) with a radius of 3.000 arc min
This is 0.789 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 (330.1637,-76.6813) with a radius of 0.025 arc min
This is 0.198 arc min from the center of the uvot region
The area of the XRT error circle is 0.002 sq. arc min
The UVOT/XRT overlap is 0.002 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 2 of trigger 889785
find_uvot_ag.pl vrs. 2017-02-17 fem started at 190220d15h16m13s072108usUT
Observation start time is 2019-02-20T03:04:55.8
Examining file ./889785_g320_uvot_catalog_image.fits
The exposure ID is 572324695
The exposure is 249.935 sec.
The bin size is 2 pixels
The filter is U
There are 4 detected source(s) for 889785_g320
Aspect correction adds -0.00147 degrees (-0.352 sec of time = -1.21 arc sec) to RA
Aspect correction adds -0.00077 degrees (-2.77 arcsec) to Dec
Total aspect correction is 3.03 arcsec
Star catalogs centered at 330.1741 , -76.6830 with radius 2.35 arc min.
n_usno: 61 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 4 matched entries is 0.303" for 889785_g320
Mean and std. dev of mag. difference (MAG_DELTA) are 0.942 and 0.212 for 889785_g320
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 889785_g320.
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=330.1420 (22:00:34.08) DEC=-76.6910 (-76:41:27.6)
XRT distances are from RA=330.1637 (22:00:39.30) DEC=-76.6813 (-76:40:52.5)
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
There are 13896.766 counts in the bkg source region of 6100.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 2.278 counts/pixel (5-sig UL in 4" is 20.02 mag) for 889785_g320
There are 500.51868 counts in the xrt source region of 200.00000 pixels.
Rate in xrt region with 8 arcsec radius is 2.503 counts/pixel for 889785_g320
There are 2685.5166 counts in the xrt_bkg source region of 1142.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 2.352 counts/pixel (5-sig UL in 4" is 20.00 mag) for 889785_g320
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 20.57, 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: 889785_572324695_190220d15h16m13s072108usUT_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(330.1779,-76.6808,45")
fk5;-circle(330.166344531172,-76.6756546218751,6")
fk5;-circle(330.147176818457,-76.6897375605749,6")
Region file: 889785_572324695_190220d15h16m13s072108usUT_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(330.16375,-76.68125,8")
Region file: 889785_572324695_190220d15h16m13s072108usUT_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(330.16375,-76.68125,25")
fk5;-circle(330.16375,-76.68125,15")
fk5;-circle(330.166344531172,-76.6756546218751,6")
image paragraph message for exposure 2 of trigger 889785
------ Start for Possible Stand-alone Circular ----
In response to GRB190220 (Swift/BAT trigger 889785) at 02:59:34 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
298 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
0.13.
------- notes for trigger 889785 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 190220d15h16m21s838670usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=889785
-expid=572324695 -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/889785/
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 572324695.84306 or about 2019:051:03:04:50 UT
Found 479 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 8% of the srclist region. Found 29 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 4 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 20.57 mag. Found 57 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 7% of the
Genie image region.
Genie image analysis:
Found 13896.8 counts in the large background region of 6100.0 pixels or a rate
of 2.278 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 20.06 mag. for a
4-arcsec aperture.
Found 500.5 counts in the XRT position region of 200.0 pixels or a rate of
2.502 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 0.121 +/- 0.097 (1-sigma) cps or
20.68 mag and a range from 20.04 to 22.42 mag. The 3-sigma UL at the XRT
position is 0.410 cps or 19.35 mag. The closest srclist source has ra= 330.1471
dec= -76.6900 mag=16.40 sep=34.50". The closest Genie source has ra= 330.1663
dec= -76.6757 mag=18.80 sep=20.26".
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?
572324695 297 U srclist found no candidates.
572324695 297 U image found no candidates.
List afterglow candidates for other finding charts.
572324483 85 WHITE 330.16312 -76.68093 19.62/19.2 1.2 srclist Yes
572324483 85 WHITE 330.16309 -76.68067 19.29/20.5 2.1 image Yes
572325273 875 WHITE srclist found no candidates.
572325273 875 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: -76.68125
GRB_ERROR: 5
GRB_RA: 330.16375
IMAGE_START_TIME: 03:04:50
MAGNITUDE: 19.4
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT