image overlap message for exposure 2 of trigger 989458
uvot_overlap.pl vrs. 2010-12-20b fem started at 200816d04h23m26s885732usUT
The observation of trigger 989458 started 2020-08-16T04:12:04.8
Examining file 989458_g281_uvot_sky_image.fits
The exposure ID is 619243924
The exposure time is 219.343 (seconds)
The filter is U.
The uvot region is centered at (202.4550,-22.5899) with a roll angle of 297.6
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 (202.4610,-22.5900) with a radius of 3.000 arc min
This is 0.330 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
Could not find the location of an XRT error circle
image afterglow message for exposure 2 of trigger 989458
find_uvot_ag.pl vrs. 2017-02-17 fem started at 200816d04h23m28s778233usUT
Observation start time is 2020-08-16T04:12:04.8
Examining file 989458_g281_uvot_catalog_image.fits
The exposure ID is 619243924
The exposure is 219.343 sec.
The bin size is 2 pixels
The filter is U
There are 4 detected source(s) for 989458_g281
Aspect correction adds -0.00205 degrees (-0.492 sec of time = -6.81 arc sec) to RA
Aspect correction adds -0.00013 degrees (-0.46 arcsec) to Dec
Total aspect correction is 6.83 arcsec
Star catalogs centered at 202.4611 , -22.5921 with radius 2.53 arc min.
n_usno: 98 n_gsc: 0
*** WARNING -- bright star catalog has 1 entries brighter than 12 mag
The brightest has mag 11.26202
RA DEC Mag Color
bright star 0: 202.42385 (13:29:41.72) -22.61559 (-22:36:56.1) 11.26 USNO-V
*** WARNING -- no XRT distances are available.
Mean distance difference (CAT_DELTA) for 5 matched entries is 0.672" for 989458_g281
Mean and std. dev of mag. difference (MAG_DELTA) are 0.764 and 0.477 for 989458_g281
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 989458_g281.
Acceptable entries have no ID, BAT distance < 200" or XRT distance < 10", 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=202.4610 (13:29:50.64) DEC=-22.5900 (-22:35:24.0)
XRT distances are as reported in catalog file.
There are 25777.352 counts in the bkg source region of 6257.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 4.120 counts/pixel (5-sig UL in 4" is 19.55 mag) for 989458_g281
Good candidates have no ID, acceptable profiles,
mag between 9.01 and 19.55, BAT distances < 200",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 989458_619243924_200816d04h23m28s778233usUT_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(202.4550,-22.5899,45")
fk5;-circle(202.46740673431,-22.5844579003025,6")
image paragraph message for exposure 2 of trigger 989458
IMAGE PROBLEM: partial overlap
------ Start for Possible Stand-alone Circular ----
In response to GRB200816 (Swift/BAT trigger 989458) at 04:07:22 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 219 seconds with the U filter starting
257 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 25% of the
BAT 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 BAT
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
0.10.
------- notes for trigger 989458 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 200816d04h23m31s290838usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=989458
-expid=619243924 -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/989458/
Links to data for all triggers can be found at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/
No XRT position found for srclist. No XRT position found for Genie image. BAT
position found.
UVOT exposure began at MET 619243924.80182 or about 2020:229:04:11:59 UT
Found 974 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 9% of the srclist region. Found 55 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
17.49 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 19.55 mag. Found 94 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 10% of the
Genie image region.
Genie image analysis:
Found 25777.4 counts in the large background region of 6257.0 pixels or a rate
of 4.120 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 19.59 mag. for a
4-arcsec aperture.
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?
619243924 256 U srclist found no candidates.
619243924 256 U image found no candidates.
List afterglow candidates for other finding charts.
619243766 98 WHITE srclist found no candidates.
619243766 98 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: SRCLIST
FILTER: u
GRB_DEC: -22.59000
GRB_ERROR: 200
GRB_RA: 202.46100
IMAGE_START_TIME: 04:11:59
MAGNITUDE: 18.0
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: BAT