image overlap message for exposure 1 of trigger 989458
uvot_overlap.pl vrs. 2010-12-20b fem started at 200816d04h15m13s803372usUT
The observation of trigger 989458 started 2020-08-16T04:09:26.7
Examining file 989458_g123_uvot_sky_image.fits
The exposure ID is 619243766
The exposure time is 149.868 (seconds)
The filter is WHITE.
*** Warning -- found 16934 null pixels in the image.
The uvot region is centered at (202.4526,-22.5913) 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 0.471 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 1 of trigger 989458
find_uvot_ag.pl vrs. 2017-02-17 fem started at 200816d04h15m15s102137usUT
Observation start time is 2020-08-16T04:09:26.7
Examining file 989458_g123_uvot_catalog_image.fits
The exposure ID is 619243766
The exposure is 149.868 sec.
The bin size is 2 pixels
The filter is WHITE
There are 4 detected source(s) for 989458_g123
Aspect correction adds -0.00163 degrees (-0.392 sec of time = -5.43 arc sec) to RA
Aspect correction adds 0.00005 degrees ( 0.17 arcsec) to Dec
Total aspect correction is 5.43 arcsec
Star catalogs centered at 202.4517 , -22.5965 with radius 2.19 arc min.
n_usno: 91 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 4 matched entries is 0.908" for 989458_g123
Mean and std. dev of mag. difference (MAG_DELTA) are 0.253 and 0.297 for 989458_g123
Found 1 entries without IDs and 1 entries that are acceptable afterglow candidates for 989458_g123.
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.
-----------------
Entry 0 in the list of sources is a candidate afterglow for 989458_g123 with genie
ra=202.45363 (13:29:48.87) dec=-22.60669 (-22:36:24.1) +/- 1.3" mag=21.01+/-0.38
dist=64.9 REFID=4 major=0.8 minor=0.3 flag=0
Found 5 entries in star catalog(s) within 20.0" of the candidate.
printing all entries
(Entries within 2 arc sec of a source list entry are considered a match)
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
202.4541 -22.6021 16.5 -1 USNO-B1 19.84 20.57 20.25
202.4543 -22.6061 3.3 -1 USNO-B1 18.45 16.82 17.54 *
202.4523 -22.6077 5.5 -1 USNO-B1 19.96 19.31 19.60
202.4532 -22.6078 4.2 -1 USNO-B1 21.86 19.47 20.53
202.4561 -22.6105 16.1 -1 USNO-B1 20.65 19.38 19.94
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 3.5" or brighter than 12 mag
There are 16527.836 counts in the bkg source region of 959.00000 pixels.
Rate in bkg region from 0 to 45 arcsec is 17.234 counts/pixel (5-sig UL in 4" is 19.80 mag) for 989458_g123
Good candidates have no ID, acceptable profiles,
mag between 9.01 and 19.80, 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_619243766_200816d04h15m15s102137usUT_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(202.4526,-22.5913,45")
image paragraph message for exposure 1 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 150 seconds with the White filter
starting 98 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 19.6 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 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 200816d04h15m29s585183usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=989458
-expid=619243766 -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 619243766.68904 or about 2020:229:04:09:21 UT
Found 535 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 9% of the srclist region. Found 47 sources in
srclist catalog. Found 1 srclist source(s) without IDs. There are 0 good
candidate(s) in the srclist catalog. Good candidates must be brighter than
18.66 mag.
Found 4 source(s) in Genie image catalog. Found 1 Genie image source(s) without
IDs. There are 0 good candidate(s) in the Genie image catalog. Good candidates
must be brighter than 19.80 mag. Found 87 stars in largest star catalog for
Genie image region. The stars will eliminate afterglows from about 12% of the
Genie image region. The Genie image is INCOMPLETE with 16934 null pixels.
Genie image analysis:
Found 16527.8 counts in the large background region of 959.0 pixels or a rate
of 17.234 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 19.80 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?
619243766 98 WHITE srclist found no candidates.
619243766 98 WHITE image found no candidates.
List afterglow candidates for other finding charts.
------- Tokens for Quick GCN -------
CATALOG_TYPE: SRCLIST
FILTER: white
GRB_DEC: -22.59000
GRB_ERROR: 200
GRB_RA: 202.46100
IMAGE_START_TIME: 04:09:21
MAGNITUDE: 18.0
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: BAT