image overlap message for exposure 2 of trigger 970886
uvot_overlap.pl vrs. 2010-12-20b fem started at 200509d16h18m41s800397usUT
The observation of trigger 970886 started 2020-05-09T06:52:23.4
Examining file ./970886_g305_uvot_sky_image.fits
The exposure ID is 610699943
The exposure time is 249.935 (seconds)
The filter is U.
The uvot region is centered at (116.4440,-4.6414) with a roll angle of 290.0
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 (116.4500,-4.6410) with a radius of 3.000 arc min
This is 0.360 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 (116.4224,-4.6304) with a radius of 0.028 arc min
This is 1.452 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 0.001 sq. arc min or 0.22 of the XRT error circle
image afterglow message for exposure 2 of trigger 970886
find_uvot_ag.pl vrs. 2017-02-17 fem started at 200509d16h18m54s605192usUT
Observation start time is 2020-05-09T06:52:23.4
Examining file ./970886_g305_uvot_catalog_image.fits
The exposure ID is 610699943
The exposure is 249.935 sec.
The bin size is 2 pixels
The filter is U
There are 17 detected source(s) for 970886_g305
Aspect correction adds -0.00193 degrees (-0.463 sec of time = -6.92 arc sec) to RA
Aspect correction adds 0.00086 degrees ( 3.08 arcsec) to Dec
Total aspect correction is 7.57 arcsec
Star catalogs centered at 116.4453 , -4.6367 with radius 2.67 arc min.
n_usno: 151 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 16 matched entries is 0.312" for 970886_g305
Mean and std. dev of mag. difference (MAG_DELTA) are 0.701 and 0.534 for 970886_g305
Found 1 entries without IDs and 1 entries that are acceptable afterglow candidates for 970886_g305.
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=116.4500 (07:45:48.00) DEC=-4.6410 (-04:38:27.6)
XRT distances are from RA=116.4224 (07:45:41.37) DEC=-4.6304 (-04:37:49.5)
-----------------
Entry 13 in the list of sources is a candidate afterglow for 970886_g305 with genie
ra=116.44079 (07:45:45.79) dec=-4.61659 (-04:36:59.7) +/- 0.7" mag=18.54+/-0.17
dist=82.7 REFID=2 major=0.9 minor=0.8 flag=0
*** The position of this source is inconsistent with the XRT position.
The position is 93.9 arc sec from the BAT position.
This source is near the edge of image (0.924)
Found 2 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
116.4398 -4.6164 3.5 -1 USNO-B1 18.01 16.78 17.33 *
116.4394 -4.6165 4.9 -1 USNO-B1 17.07 16.23 16.60 *
Due to star catalog entries marked with *, this is probably NOT the afterglow
These entries are within 5.25" or brighter than 12 mag
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
116.4240 -4.6317 7.5 -1 USNO-B1 18.25 17.50 17.84
The closest star is 7.47" away.
List UVOT sources within 10" of the XRT position:
Matched source ra=116.42414 (07:45:41.79) dec=-4.63167 (-04:37:54.0) +/- 0.7" mag=18.55+/-0.17 dist=7.8 REFID=6 flag=0
There are 17787.777 counts in the bkg source region of 5843.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 3.044 counts/pixel (5-sig UL in 4" is 19.86 mag) for 970886_g305
Do not compute counts in XRT region because position is too far from center.
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 20.42, 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: 970886_610699943_200509d16h18m54s605192usUT_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(116.4440,-4.6414,45")
fk5;-circle(116.449299821056,-4.63986332907215,6")
fk5;-circle(116.455995323748,-4.64885662329232,6")
fk5;-circle(116.447991247193,-4.63083475244323,6")
fk5;-circle(116.446198103938,-4.62923460943515,6")
fk5;-circle(116.445019081248,-4.65291711044251,6")
fk5;-circle(116.436359573423,-4.64870614040429,6")
image paragraph message for exposure 2 of trigger 970886
THIS MESSAGE IS *NOT* READY FOR DISTRIBUTION.
MORE ANALYSIS IS REQUIRED TO DETERMINE WHETHER THERE IS AN AFTERGLOW CANDIDATE.
IMAGE PROBLEM: partial overlap
SRCLIST PROBLEM: srclist filled telemetry buffer
See notes for more details.
1 source(s) near the XRT position were rejected as afterglow candidate(s). See
notes for details.
------ Start for Possible Stand-alone Circular ----
In response to GRB200509 (Swift/BAT trigger 970886) at 06:47:17 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
281 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 22% 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 970886 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 200509d16h18m57s807005usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=970886
-expid=610699943 -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/970886/
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 610699943.43784 or about 2020:130:06:52:18 UT
Found 1508 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 14% of the srclist region. Found 190 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 20 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 17 source(s) in Genie image catalog. 1 source(s) are within 10.0" of the
xrt position. 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
20.42 mag. Found 147 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 14% of the Genie image region.
Genie image analysis:
Found 17787.8 counts in the large background region of 5843.0 pixels or a rate
of 3.044 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 19.90 mag. for a
4-arcsec aperture. The number of srclist sources filled the available
telemetry. The weakest source detected was 18.41 mag. The closest srclist
source has ra= 116.4182 dec= -4.6218 mag=17.22 sep=34.51".
Found 1 Genie source(s) within 10.0" of the XRT position. The brightest such
source has ra= 116.4241 dec= -4.6317 mag=18.55 sep=7.79". The closest Genie
source has ra= 116.4241 dec= -4.6317 mag=18.55 sep=7.79".
Report rejected UVOT sources within 10 arcsec XRT position.
Such sources are usually NOT the afterglow.
****THIS SOURCE NEAR XRT POSITION WAS REJECTED--USE WITH CAUTION****
UVOT took a finding chart exposure of 250 seconds with the U filter starting
281 seconds after the BAT trigger. There is a candidate afterglow in the
rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 07:45:41.79 = 116.42414
DEC(J2000) = -04:37:54.0 = -4.63167
with a 90%-confidence error radius of about 0.67 arc sec. This position is 7.79
arc sec. from the center of the XRT error circle. The estimated magnitude is
18.55 with a 1-sigma error of about 0.17. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.13.
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?
610699943 280 U srclist found no candidates.
610699943 280 U image found no candidates.
List afterglow candidates for other finding charts.
610699785 122 WHITE 116.42166 -4.63040 19.15/19.2 2.5 srclist Yes
610699785 122 WHITE image found no candidates.
610700522 859 WHITE srclist found no candidates.
610700522 859 WHITE image found no candidates.
------- Tokens for Quick GCN -------