srclist overlap message for exposure 2 of trigger 821902
uvot_overlap.pl vrs. 2010-12-20b fem started at 180404d08h26m19s900088usUT
The observation of trigger 821902 started 2018-04-04T02:16:59.4
Examining file ./821902_g314_uvot_sky_srclist.fits
The exposure ID is 544501019
The exposure time is undefined.
The filter is U.
The uvot region is centered at (53.3888,-50.2139) with a roll angle of 315.1
It is square with sides of 8.03 arc min. for an area of 64.51 sq arc min
The BAT error circle is centered at (53.3840,-50.1950) with a radius of 3.000 arc min
This is 1.151 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 28.15 sq. arc min or 1.00 of the BAT error circle
The XRT error circle is centered at (53.3927,-50.2155) with a radius of 0.048 arc min
This is 0.176 arc min from the center of the uvot region
The area of the XRT error circle is 0.007 sq. arc min
The UVOT/XRT overlap is 0.007 sq. arc min or 1.00 of the XRT error circle
srclist afterglow message for exposure 2 of trigger 821902
find_uvot_ag.pl vrs. 2017-02-17 fem started at 180404d08h26m33s602521usUT
Observation start time is 2018-04-04T02:16:59.4
Examining file ./821902_g314_uvot_catalog_srclist.fits
The exposure ID is 544501019
The exposure is 249.935 sec.
The bin size is 2 pixels
The filter is U
There are 17 detected source(s) for 821902_g314
Aspect correction adds -0.00243 degrees (-0.583 sec of time = -5.60 arc sec) to RA
Aspect correction adds -0.00048 degrees (-1.72 arcsec) to Dec
Total aspect correction is 5.86 arcsec
Star catalogs centered at 53.3954 , -50.2089 with radius 5.33 arc min.
n_usno: 204 n_gsc: 181
Bright star catalog has no entries brighter than 12 mag
Mean distance difference (CAT_DELTA) for 12 matched entries is 0.501" for 821902_g314
Mean and std. dev of mag. difference (MAG_DELTA) are 1.071 and 0.424 for 821902_g314
Found 5 entries without IDs and 0 entries that are acceptable afterglow candidates for 821902_g314.
Acceptable entries have no ID, XRT distances < 7.25", 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=53.3840 (03:33:32.16) DEC=-50.1950 (-50:11:42.0)
XRT distances are from RA=53.3927 (03:33:34.24) DEC=-50.2155 (-50:12:55.8)
*** WARNING 29 per cent of entries have no IDs.
Found NO acceptable entries.
Unidentified entry closest to XRT position is no. 8:
ra= 53.47487 dec=-50.21649 +/- 1.1" mag=19.09+/-0.35 dist=189.4 REFID=15
Found 0 entries in star catalog(s) within 10" of the XRT position.
List UVOT sources within 10" of the XRT position:
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 < 7.25",
are > ~(80 - 10*(mag-6))" from any bright star, and have had duplicates removed.
SUMMARY: 0 good candidate(s) found.
srclist paragraph message for exposure 2 of trigger 821902
------ Start for Possible Stand-alone Circular ----
In response to GRB180404 (Swift/BAT trigger 821902) at 02:11:44 UT,
---- UVOT paragraph for Joint or Stand-alone Circular ----
UVOT took a finding chart exposure of 250 seconds with the U filter starting
294 seconds after the BAT trigger. There is a candidate afterglow in the
rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 03:33:34.25 = 53.39270
DEC(J2000) = -50:12:53.4 = -50.21482
with a 90%-confidence error radius of about 0.94 arc sec. This position is 2.4
arc sec. from the center of the XRT error circle. The estimated magnitude is
19.64 with a 1-sigma error of about 0.24. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.01.
------- notes for trigger 821902 ------
uvot_gcn_auto.pl vrs. 2016-09-07 fem at 180404d08h26m38s415538usUT
Command line: /Home/eud/uvot_tdrss/perl/uvot_gcn_auto.pl -trig=821902
-expid=544501019 -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/821902/
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 544501019.3722 or about 2018:094:02:16:54 UT
Found 200 stars in largest star catalog for srclist region. The stars will
eliminate afterglows from about 4% of the srclist region. Found 17 sources in
srclist catalog. Found 5 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 3 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
20.21 mag. Found 40 stars in largest star catalog for Genie image region. The
stars will eliminate afterglows from about 4% of the Genie image region. The
closest srclist source has ra= 53.3454 dec= -50.2220 mag=17.64 sep=111.30".
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?
544501019 294 U srclist found no candidates.
544501019 294 U 53.39270 -50.21482 19.64/20.2 2.4 image Yes
List afterglow candidates for other finding charts.
544500806 81 WHITE 53.39267 -50.21515 18.69/19.2 1.3 srclist Yes
544500806 81 WHITE 53.39265 -50.21504 18.61/20.4 1.6 image Yes
------- Tokens for Quick GCN -------
CATALOG_TYPE: IMAGE
FILTER: u
GRB_DEC: -50.21482
GRB_ERROR: 0.94
GRB_RA: 53.39270
IMAGE_START_TIME: 02:16:54
MAGNITUDE: 19.64
MAG_ERROR: 0.24
MESSAGE_TYPE: ACK
SOURCE: XRT