[vsnet-grb 171491] GCN/SWIFT_XRT_POSITION_UPDATE

[Bacodine]

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 27 Mar 12 03:20:14 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     518731,   Seg_Num: 0
GRB_RA:          246.8646d {+16h 27m 27.50s} (J2000),
                 247.0567d {+16h 28m 13.61s} (current),
                 246.0805d {+16h 24m 19.31s} (1950)
GRB_DEC:         -29.4152d {-29d 24' 54.7"} (J2000),
                 -29.4419d {-29d 26' 30.6"} (current),
                 -29.3041d {-29d 18' 14.6"} (1950)
GRB_ERROR:       2.0 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  16013 TJD;    87 DOY;   12/03/27
IMG_START_TIME:  10769.00 SOD {02:59:29.00} UT,   252.4 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:         6.30d {+00h 25m 13s}   +2.72d {+02d 43' 28"}
SUN_DIST:        116.64 [deg]   Sun_angle= 7.9 [hr] (West of Sun)
MOON_POSTN:       53.77d {+03h 35m 06s}  +20.17d {+20d 10' 01"}
MOON_DIST:       164.81 [deg]
MOON_ILLUM:      18 [%]
GAL_COORDS:      349.36, 13.40 [deg] galactic lon,lat of the burst
ECL_COORDS:      249.80, -7.58 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        This is an Update Notice -- the RA,Dec values herein supersede the previous XRT_POS Notice.  
COMMENTS:        TAM values, flux and significance fields are not valid.  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
COMMENTS:        This position was enhanced using UVOT field astrometry.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.58% < P(seren) < 1.1%.