srclist overlap message for exposure 2 of trigger 966554
uvot_overlap.pl vrs. 2010-12-20b fem started at 200416d15h08m18s952896usUT
The observation of trigger 966554 started 2020-04-16T07:10:56.3
Examining file ./966554_g338_uvot_sky_srclist.fits
The exposure ID is 608713856
The exposure time is undefined.
The filter is U.
The uvot region is centered at (335.6945,-7.5281) with a roll angle of 70.6
It is square with sides of 12.05 arc min. for an area of 145.15 sq arc min
The BAT error circle is centered at (335.6910,-7.5300) with a radius of 3.000 arc min
This is 0.238 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 28.27 sq. arc min or 1.00 of the BAT error circle
The XRT error circle is centered at (335.6986,-7.5179) with a radius of 0.058 arc min
This is 0.660 arc min from the center of the uvot region
The area of the XRT error circle is 0.011 sq. arc min
The UVOT/XRT overlap is 0.011 sq. arc min or 1.00 of the XRT error circle
srclist afterglow message for exposure 2 of trigger 966554
find_uvot_ag.pl vrs. 2017-02-17 fem started at 200416d15h08m33s256089usUT
Observation start time is 2020-04-16T07:10:56.3
Examining file ./966554_g338_uvot_catalog_srclist.fits
The exposure ID is 608713856
The exposure is 249.924 sec.
The bin size is 2 pixels
The filter is U
There are 75 detected source(s) for 966554_g338
Aspect correction adds 0.00161 degrees (0.386 sec of time = 5.74 arc sec) to RA
Aspect correction adds -0.00017 degrees (-0.60 arcsec) to Dec
Total aspect correction is 5.78 arcsec
Star catalogs centered at 335.7002 , -7.5225 with radius 8.45 arc min.
n_usno: 581 n_gsc: 0
*** WARNING -- bright star catalog has 3 entries brighter than 12 mag
The brightest has mag 9.31184
RA DEC Mag Color
bright star 0: 335.70805 (22:22:49.93) -7.58650 (-07:35:11.4) 11.84 USNO-V
bright star 1: 335.62391 (22:22:29.74) -7.45738 (-07:27:26.6) 9.31 USNO-V
bright star 2: 335.62710 (22:22:30.50) -7.40987 (-07:24:35.5) 11.63 USNO-V
Mean distance difference (CAT_DELTA) for 32 matched entries is 0.562" for 966554_g338
Mean and std. dev of mag. difference (MAG_DELTA) are 1.518 and 0.596 for 966554_g338
Found 43 entries without IDs and 1 entries that are acceptable afterglow candidates for 966554_g338.
Acceptable entries have no ID, XRT distances < 8.75", and are > 0.8*(80 - 10*(mag-6))" from any bright star
from any bright star and >21.6" from other rejected sources.
38 sources matched bright stars.
Magnitude criteria will be applied later.
BAT distances are from RA=335.6910 (22:22:45.84) DEC=-7.5300 (-07:31:48.0)
XRT distances are from RA=335.6986 (22:22:47.66) DEC=-7.5179 (-07:31:04.3)
*** WARNING 57 per cent of entries have no IDs.
-----------------
Entry 0 in the list of sources is a candidate afterglow for 966554_g338 with 5x5 stamp
ra=335.69933 (22:22:47.84) dec=-7.51833 (-07:31:06.0) +/- 1.1" mag=16.74+/-0.35
dist=3.2 REFID=15
src: 0 distr. of nearby unmatched sources: 0 0 0 0 0
Found 0 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)
##### This source remains a candidate #####
It has no entries within 4" or brighter than 13 mag
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
Unmatched source ra=335.69933 (22:22:47.84) dec=-7.51833 (-07:31:06.0) +/- 1.1" mag=16.74+/-0.35 dist=3.2 REFID=15
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 18.12, XRT distances < 8.75",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 1 good candidate(s) found.
srclist paragraph message for exposure 2 of trigger 966554
------ Start for Possible Stand-alone Circular ----
In response to GRB200416 (Swift/BAT trigger 966554) at 07:05:17 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
314 seconds after the BAT trigger. There is a candidate afterglow in the
rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 22:22:47.83 = 335.69929
DEC(J2000) = -07:31:06.0 = -7.51834
with a 90%-confidence error radius of about 0.75 arc sec. This position is 3.1
arc sec. from the center of the XRT error circle. The estimated magnitude is
16.39 with a 1-sigma error of about 0.14. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.06.
------- notes for trigger 966554 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 200416d15h08m43s163346usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=966554
-expid=608713856 -meonly -msg_srclist
Results from standard processing of UVOT TDRSS data for this trigger should be
available at
http://heasarc.gsfc.nasa.gov/docs/swift/uvot_tdrss/966554/
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 608713856.28794 or about 2020:107:07:10:51 UT
Found 577 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 5% of the srclist region. Found 75 sources in
srclist catalog. Found 43 srclist source(s) without IDs. There are 1 good
candidate(s) in the srclist catalog. Good candidates must be brighter than
18.12 mag.
Found 2 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 1 good
candidate(s) in the Genie image catalog. Good candidates must be brighter than
19.54 mag. Found 33 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 5% of the Genie image region.
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?
608713856 314 U 335.69933 -7.51833 16.74/18.1 3.2 srclist Yes
608713856 314 U 335.69929 -7.51834 16.39/19.5 3.1 image Yes
List afterglow candidates for other finding charts.
608713644 102 WHITE 335.69933 -7.51822 17.19/19.2 3.0 srclist Yes
608713644 102 WHITE 335.69929 -7.51831 16.47/20.0 3.0 image Yes
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: -7.51834
GRB_ERROR: 0.75
GRB_RA: 335.69929
IMAGE_START_TIME: 07:10:51
MAGNITUDE: 16.39
MAG_ERROR: 0.14
MESSAGE_TYPE: ACK
SOURCE: XRT