[vsnet-grb 154648] GCN/SWIFT_XRT_POSITION_UPDATE

[Bacodine]

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 31 Jul 11 11:30:51 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     458448,   Seg_Num: 0
GRB_RA:          280.5036d {+18h 42m 00.86s} (J2000),
                 280.6864d {+18h 42m 44.73s} (current),
                 279.7139d {+18h 38m 51.33s} (1950)
GRB_DEC:         -28.5370d {-28d 32' 13.1"} (J2000),
                 -28.5251d {-28d 31' 30.5"} (current),
                 -28.5859d {-28d 35' 09.1"} (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:  15773 TJD;   212 DOY;   11/07/31
IMG_START_TIME:  40818.00 SOD {11:20:18.00} UT,   647.6 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       130.35d {+08h 41m 23s}  +18.28d {+18d 17' 02"}
SUN_DIST:        151.02 [deg]   Sun_angle= -10.0 [hr] (East of Sun)
MOON_POSTN:      138.45d {+09h 13m 49s}  +11.73d {+11d 43' 51"}
MOON_DIST:       141.00 [deg]
MOON_ILLUM:      1 [%]
GAL_COORDS:        6.22,-10.70 [deg] galactic lon,lat of the burst
ECL_COORDS:      279.26, -5.43 [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%.