image overlap message for exposure 1 of trigger 970886
uvot_overlap.pl vrs. 2010-12-20b fem started at 200509d16h18m40s951007usUT
The observation of trigger 970886 started 2020-05-09T06:49:45.6
Examining file ./970886_g147_uvot_sky_image.fits
The exposure ID is 610699785
The exposure time is 149.857 (seconds)
The filter is WHITE.
The uvot region is centered at (116.4418,-4.6431) 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 0.506 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 1.391 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 0.42 of the XRT error circle
image afterglow message for exposure 1 of trigger 970886
find_uvot_ag.pl vrs. 2017-02-17 fem started at 200509d16h18m47s100661usUT
Observation start time is 2020-05-09T06:49:45.6
Examining file ./970886_g147_uvot_catalog_image.fits
The exposure ID is 610699785
The exposure is 149.857 sec.
The bin size is 2 pixels
The filter is WHITE
There are 21 detected source(s) for 970886_g147
Aspect correction adds -0.00207 degrees (-0.496 sec of time = -7.42 arc sec) to RA
Aspect correction adds 0.00102 degrees ( 3.68 arcsec) to Dec
Total aspect correction is 8.28 arcsec
Star catalogs centered at 116.4452 , -4.6376 with radius 2.65 arc min.
n_usno: 147 n_gsc: 0
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 20 matched entries is 0.261" for 970886_g147
Mean and std. dev of mag. difference (MAG_DELTA) are 0.531 and 0.310 for 970886_g147
Found 1 entries without IDs and 1 entries that are acceptable afterglow candidates for 970886_g147.
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 17 in the list of sources is a candidate afterglow for 970886_g147 with genie
ra=116.44080 (07:45:45.79) dec=-4.61658 (-04:36:59.7) +/- 0.6" mag=18.49+/-0.15
dist=82.8 REFID=2 major=1.0 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 (0.922)
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 3.6 -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=116.42411 (07:45:41.79) dec=-4.63167 (-04:37:54.0) +/- 0.6" mag=18.34+/-0.15 dist=7.7 REFID=7 flag=0
There are 64344.551 counts in the bkg source region of 5650.0000 pixels.
Rate in bkg region from 0 to 45 arcsec is 11.388 counts/pixel (5-sig UL in 4" is 20.03 mag) for 970886_g147
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 20.58, 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_610699785_200509d16h18m47s100661usUT_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(116.4418,-4.6431,45")
fk5;-circle(116.449295521346,-4.63987832608205,6")
fk5;-circle(116.447612691632,-4.63769399857938,6")
fk5;-circle(116.447989874178,-4.63083256849779,6")
fk5;-circle(116.440097861757,-4.63629552152986,6")
fk5;-circle(116.444962289009,-4.65293957261463,6")
fk5;-circle(116.441442794055,-4.65335094204094,6")
fk5;-circle(116.436197198363,-4.64875618528986,6")
image paragraph message for exposure 1 of trigger 970886
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 150 seconds with the White filter
starting 123 seconds after the BAT trigger. There is a candidate afterglow in
the list of sources generated on-board at
RA(J2000) = 07:45:41.20 = 116.42166
DEC(J2000) = -04:37:49.4 = -4.63040
with a 90%-confidence error radius of about 1.10 arc sec. This position is 2.5
arc sec. from the center of the XRT error circle. The estimated magnitude is
19.15. 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 200509d16h18m50s305265usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=970886
-expid=610699785 -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 610699785.56778 or about 2020:130:06:49:40 UT
Found 851 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 14% of the srclist region. Found 187 sources in
srclist catalog. WARNING -- srclist catalog buffer filled. Found 20 srclist
source(s) without IDs. There are 1 good candidate(s) in the srclist catalog.
Good candidates must be brighter than 19.22 mag.
Found 21 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
20.58 mag. Found 143 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 14% of the Genie image region.
Found 1 Genie source(s) within 10.0" of the XRT position. The brightest such
source has ra= 116.4241 dec= -4.6317 mag=18.34 sep=7.71". The closest Genie
source has ra= 116.4241 dec= -4.6317 mag=18.34 sep=7.71".
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 150 seconds with the White filter
starting 123 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 = 116.42411
DEC(J2000) = -04:37:54.0 = -4.63167
with a 90%-confidence error radius of about 0.63 arc sec. This position is 7.71
arc sec. from the center of the XRT error circle. The estimated magnitude is
18.34 with a 1-sigma error of about 0.15. 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?
610699785 122 WHITE 116.42166 -4.63040 19.15/19.2 2.5 srclist Yes
610699785 122 WHITE image found no candidates.
List afterglow candidates for other finding charts.
610699943 280 U srclist found no candidates.
610699943 280 U image found no candidates.
610700522 859 WHITE srclist found no candidates.
610700522 859 WHITE image found no candidates.
------- Tokens for Quick GCN -------
CATALOG_TYPE: SRCLIST
FILTER: white
GRB_DEC: -4.63040
GRB_ERROR: 1.10
GRB_RA: 116.42166
IMAGE_START_TIME: 06:49:40
MAGNITUDE: 19.15
MAG_ERROR: 0.4
MESSAGE_TYPE: ACK
SOURCE: XRT