[vsnet-grb 156009] GCN/SWIFT_XRT_POSITION_UPDATE

[Bacodine]

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 18 Aug 11 20:57:13 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     500914,   Seg_Num: 0
GRB_RA:          317.3381d {+21h 09m 21.14s} (J2000),
                 317.5767d {+21h 10m 18.40s} (current),
                 316.3056d {+21h 05m 13.33s} (1950)
GRB_DEC:         -63.9814d {-63d 58' 53.0"} (J2000),
                 -63.9337d {-63d 56' 01.3"} (current),
                 -64.1844d {-64d 11' 03.9"} (1950)
GRB_ERROR:       2.1 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  15791 TJD;   230 DOY;   11/08/18
IMG_START_TIME:  74716.00 SOD {20:45:16.00} UT,   446.8 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       147.83d {+09h 51m 20s}  +13.00d {+12d 59' 48"}
SUN_DIST:        128.56 [deg]   Sun_angle= -11.3 [hr] (East of Sun)
MOON_POSTN:       19.00d {+01h 16m 00s}  +12.67d {+12d 40' 13"}
MOON_DIST:        89.54 [deg]
MOON_ILLUM:      78 [%]
GAL_COORDS:      330.71,-39.11 [deg] galactic lon,lat of the burst
ECL_COORDS:      297.11,-44.93 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        There is a bright star (mag=5.76) 6.16 arcmin from the XRT position.  
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%.