[vsnet-grb 147265] GCN/SWIFT_XRT_POSITION_UPDATE

[Bacodine]

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 20 Apr 11 11:26:23 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     451757,   Seg_Num: 0
GRB_RA:            2.1633d {+00h 08m 39.19s} (J2000),
                   2.3062d {+00h 09m 13.47s} (current),
                   1.5298d {+00h 06m 07.15s} (1950)
GRB_DEC:         -37.8864d {-37d 53' 11.0"} (J2000),
                 -37.8235d {-37d 49' 24.7"} (current),
                 -38.1647d {-38d 09' 52.7"} (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:  15671 TJD;   110 DOY;   11/04/20
IMG_START_TIME:  39901.00 SOD {11:05:01.00} UT,   157.0 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:        27.95d {+01h 51m 48s}  +11.49d {+11d 29' 10"}
SUN_DIST:         54.85 [deg]   Sun_angle= 1.7 [hr] (West of Sun)
MOON_POSTN:      240.36d {+16h 01m 27s}  -22.65d {-22d 38' 57"}
MOON_DIST:        98.60 [deg]
MOON_ILLUM:      92 [%]
GAL_COORDS:      340.14,-75.98 [deg] galactic lon,lat of the burst
ECL_COORDS:      344.62,-35.12 [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 1.1% < P(seren) < 2.8%.