[vsnet-grb 146657] GCN/SWIFT_XRT_POSITION_UPDATE

[Bacodine]

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 11 Apr 11 19:48:30 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     451165,   Seg_Num: 0
GRB_RA:          291.4420d {+19h 25m 46.08s} (J2000),
                 291.4438d {+19h 25m 46.52s} (current),
                 291.4321d {+19h 25m 43.70s} (1950)
GRB_DEC:         +67.7115d {+67d 42' 41.4"} (J2000),
                 +67.7344d {+67d 44' 04.0"} (current),
                 +67.6097d {+67d 36' 35.0"} (1950)
GRB_ERROR:       2.3 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  15662 TJD;   101 DOY;   11/04/11
IMG_START_TIME:  70629.00 SOD {19:37:09.00} UT,   177.2 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:        19.94d {+01h 19m 46s}   +8.41d {+08d 24' 36"}
SUN_DIST:         81.65 [deg]   Sun_angle= 5.9 [hr] (West of Sun)
MOON_POSTN:      117.02d {+07h 48m 05s}  +18.42d {+18d 24' 55"}
MOON_DIST:        93.75 [deg]
MOON_ILLUM:      54 [%]
GAL_COORDS:       99.11, 21.81 [deg] galactic lon,lat of the burst
ECL_COORDS:       17.67, 81.63 [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%.