image overlap message for exposure 1 of trigger 922808
uvot_overlap.pl vrs. 2010-12-20b fem started at 190828d16h08m57s683534usUT
The observation of trigger 922808 started 2019-08-28T13:01:26.0
Examining file ./922808_g85_uvot_sky_image.fits
The exposure ID is 588690085
The exposure time is 149.868 (seconds)
The filter is WHITE.
The uvot region is centered at (251.8276,27.2807) with a roll angle of 280.9
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 (251.8180,27.2370) with a radius of 3.000 arc min
This is 2.672 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 4.18 sq. arc min or 0.15 of the BAT error circle
The XRT error circle is centered at (251.8313,27.2809) with a radius of 0.028 arc min
This is 0.195 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 922808
find_uvot_ag.pl vrs. 2017-02-17 fem started at 190828d16h09m05s405354usUT
Observation start time is 2019-08-28T13:01:26.0
Examining file ./922808_g85_uvot_catalog_image.fits
The exposure ID is 588690085
The exposure is 149.868 sec.
The bin size is 2 pixels
The filter is WHITE
There are 6 detected source(s) for 922808_g85
Aspect correction adds -0.00184 degrees (-0.441 sec of time = -5.88 arc sec) to RA
Aspect correction adds -0.00062 degrees (-2.24 arcsec) to Dec
Total aspect correction is 6.29 arcsec
Star catalogs centered at 251.8261 , 27.2827 with radius 2.62 arc min.
n_usno: 86 n_gsc: 0
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 11.532
RA DEC Mag Color
bright star 0: 251.82517 (16:47:18.04) 27.24234 (+27:14:32.4) 11.53 USNO-V
Mean distance difference (CAT_DELTA) for 8 matched entries is 0.588" for 922808_g85
Mean and std. dev of mag. difference (MAG_DELTA) are 0.572 and 0.414 for 922808_g85
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 922808_g85.
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.
0 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=251.8180 (16:47:16.32) DEC=27.2370 (+27:14:13.2)
XRT distances are from RA=251.8313 (16:47:19.51) DEC=27.2809 (+27:16:51.3)
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
There are 40429.305 counts in the bkg source region of 6197.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 6.524 counts/pixel (5-sig UL in 4" is 20.33 mag) for 922808_g85
There are 1305.0175 counts in the xrt source region of 201.00000 pixels.
Rate in xrt region with 8 arcsec radius is 6.493 counts/pixel for 922808_g85
There are 8307.2344 counts in the xrt_bkg source region of 1250.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 6.646 counts/pixel (5-sig UL in 4" is 20.32 mag) for 922808_g85
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 20.89, 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: 922808_588690085_190828d16h09m05s405354usUT_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(251.8276,27.2807,45")
fk5;-circle(251.816144505639,27.2792619231615,6")
Region file: 922808_588690085_190828d16h09m05s405354usUT_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(251.83129,27.28092,8")
Region file: 922808_588690085_190828d16h09m05s405354usUT_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(251.83129,27.28092,25")
fk5;-circle(251.83129,27.28092,15")
image paragraph message for exposure 1 of trigger 922808
------ Start for Possible Stand-alone Circular ----
In response to GRB190828 (Swift/BAT trigger 922808) at 12:59:59 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 63 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
0.10.
------- notes for trigger 922808 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 190828d16h09m09s268893usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=922808
-expid=588690085 -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/922808/
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 588690085.99488 or about 2019:240:13:01:20 UT
Found 583 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 9% of the srclist region. Found 100 sources in
srclist catalog. Found 47 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 6 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 20.89 mag. Found 82 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 8% of the
Genie image region.
Genie image analysis:
Found 40429.3 counts in the large background region of 6197.0 pixels or a rate
of 6.524 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 20.33 mag. for a
4-arcsec aperture.
Found 1305.0 counts in the XRT position region of 201.0 pixels or a rate of
6.493 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is -0.205 +/- 0.260 (1-sigma) cps. The
3-sigma UL at the XRT position is 0.780 cps or 20.05 mag. The closest srclist
source has ra= 251.8447 dec= 27.2760 mag=19.44 sep=46.55". The closest Genie
source has ra= 251.8448 dec= 27.2759 mag=18.72 sep=47.01".
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?
588690085 62 WHITE srclist found no candidates.
588690085 62 WHITE image found no candidates.
List afterglow candidates for other finding charts.
588690297 274 U srclist found no candidates.
588690297 274 U image found no candidates.
588690899 876 WHITE srclist found no candidates.
588690899 876 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: 27.28092
GRB_ERROR: 5
GRB_RA: 251.83129
IMAGE_START_TIME: 13:01:20
MAGNITUDE: 20.1
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT