image overlap message for exposure 1 of trigger 992099
uvot_overlap.pl vrs. 2010-12-20b fem started at 200819d18h24m23s341658usUT
The observation of trigger 992099 started 2020-08-19T15:45:46.8
Examining file ./992099_g113_uvot_sky_image.fits
The exposure ID is 619544746
The exposure time is 149.868 (seconds)
The filter is WHITE.
The uvot region is centered at (21.4349,63.0552) with a roll angle of 50.6
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 (21.4280,63.0480) with a radius of 3.000 arc min
This is 0.469 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 (21.4242,63.0609) with a radius of 0.037 arc min
This is 0.452 arc min from the center of the uvot region
The area of the XRT error circle is 0.004 sq. arc min
The UVOT/XRT overlap is 0.004 sq. arc min or 1.00 of the XRT error circle
image afterglow message for exposure 1 of trigger 992099
find_uvot_ag.pl vrs. 2017-02-17 fem started at 200819d18h24m28s793919usUT
Observation start time is 2020-08-19T15:45:46.8
Examining file ./992099_g113_uvot_catalog_image.fits
The exposure ID is 619544746
The exposure is 149.868 sec.
The bin size is 2 pixels
The filter is WHITE
There are 20 detected source(s) for 992099_g113
Aspect correction adds 0.00302 degrees (0.725 sec of time = 4.93 arc sec) to RA
Aspect correction adds 0.00093 degrees ( 3.36 arcsec) to Dec
Total aspect correction is 5.96 arcsec
Star catalogs centered at 21.4308 , 63.0562 with radius 2.73 arc min.
n_usno: 351 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 22 matched entries is 0.492" for 992099_g113
Mean and std. dev of mag. difference (MAG_DELTA) are 0.908 and 0.406 for 992099_g113
Found 0 entries without IDs and 0 entries that are acceptable afterglow candidates for 992099_g113.
Acceptable entries have no ID, XRT distances < 5.5", 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=21.4280 (01:25:42.72) DEC=63.0480 (+63:02:52.8)
XRT distances are from RA=21.4242 (01:25:41.81) DEC=63.0609 (+63:03:39.3)
Found 1 entries in star catalog(s) within 10" of the XRT position.
RA Dec Sep. Match USNO/ USNO-B USNO-R USNO-V
GSC GSC-F GSC-J GSC-V
21.4214 63.0596 6.6 -1 USNO-B1 21.12 19.02 19.96
The closest star is 6.57" away.
List UVOT sources within 10" of the XRT position:
There are 1.1620092E+05 counts in the bkg source region of 5611.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 20.709 counts/pixel (5-sig UL in 4" is 19.70 mag) for 992099_g113
There are 4244.6636 counts in the xrt source region of 202.00000 pixels.
Rate in xrt region with 8 arcsec radius is 21.013 counts/pixel for 992099_g113
There are 21457.867 counts in the xrt_bkg source region of 1045.0000 pixels.
Rate in xrt_bkg region from 15 to 25 arcsec is 20.534 counts/pixel (5-sig UL in 4" is 19.71 mag) for 992099_g113
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 20.26, XRT distances < 5.5",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
Region file: 992099_619544746_200819d18h24m28s793919usUT_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(21.4349,63.0552,45")
fk5;-circle(21.4260378043962,63.0499171155779,6")
fk5;-circle(21.4430008767878,63.0466249119915,6")
fk5;-circle(21.4365779405747,63.0569597815788,6")
fk5;-circle(21.4470898005115,63.0583912392994,6")
fk5;-circle(21.4385320565017,63.0646733760591,6")
fk5;-circle(21.4317814148043,63.0654185807918,6")
fk5;-circle(21.4306076936648,63.0681082941351,6")
Region file: 992099_619544746_200819d18h24m28s793919usUT_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(21.42421,63.06092,8")
Region file: 992099_619544746_200819d18h24m28s793919usUT_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(21.42421,63.06092,25")
fk5;-circle(21.42421,63.06092,15")
fk5;-circle(21.4365779405747,63.0569597815788,6")
fk5;-circle(21.4385320565017,63.0646733760591,6")
fk5;-circle(21.4317814148043,63.0654185807918,6")
fk5;-circle(21.4306076936648,63.0681082941351,6")
image paragraph message for exposure 1 of trigger 992099
WARNING -- because of the LARGE EXTINCTION, results should be used cautiously.
------ Start for Possible Stand-alone Circular ----
In response to GRB200819 (Swift/BAT trigger 992099) at 15:43:52 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 88 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 large, but uncertain, extinction expected.
------- notes for trigger 992099 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 200819d18h24m32s754238usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=992099
-expid=619544746 -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/992099/
Links to data for all triggers can be found at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/
Large extinction of 5.21 found for bat position. Unreliable extinction found
for xrt position. XRT position found for srclist. XRT position found for Genie
image. BAT position found.
UVOT exposure began at MET 619544746.82556 or about 2020:232:15:45:41 UT
Found 1751 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 31% of the srclist region. Found 133 sources in
srclist catalog. Found 37 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 20 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 20.26 mag. Found 347 stars in largest star
catalog for Genie image region. The stars will eliminate afterglows from about
32% of the Genie image region.
Genie image analysis:
Found 116200.9 counts in the large background region of 5611.0 pixels or a rate
of 20.709 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 19.70 mag. for a
4-arcsec aperture.
Found 4244.7 counts in the XRT position region of 202.0 pixels or a rate of
21.013 counts/pixel in a radius of 8.0 arcsec. The net count rate (using local
background region) at the XRT position is 0.646 +/- 0.474 (1-sigma) cps or
20.25 mag and a range from 19.66 to 21.69 mag. The 3-sigma UL at the XRT
position is 2.066 cps or 18.99 mag. The closest srclist source has ra= 21.4384
dec= 63.0647 mag=17.39 sep=26.80". The closest Genie source has ra= 21.4318
dec= 63.0654 mag=19.01 sep=20.36".
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?
619544746 87 WHITE srclist found no candidates.
619544746 87 WHITE image found no candidates.
List afterglow candidates for other finding charts.
619544958 299 U srclist found no candidates.
619544958 299 U image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: white
GRB_DEC: 63.06092
GRB_ERROR: 5.5
GRB_RA: 21.42421
IMAGE_START_TIME: 15:45:41
MAGNITUDE: 19.0
MAG_ERROR: 3.0
MESSAGE_TYPE: NACK
SOURCE: XRT