[vsnet-grb 480894] GCN/SWIFT_XRT_POSITION_UPDATE

[Bacodine]

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 11 Apr 21 15:18:37 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     1042398,   Seg_Num: 0
GRB_RA:          296.6116d {+19h 46m 26.78s} (J2000),
                 296.9710d {+19h 47m 53.03s} (current),
                 295.7654d {+19h 43m 03.70s} (1950)
GRB_DEC:         -39.3971d {-39d 23' 49.5"} (J2000),
                 -39.3437d {-39d 20' 37.3"} (current),
                 -39.5200d {-39d 31' 11.8"} (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:  19315 TJD;   101 DOY;   21/04/11
IMG_START_TIME:  54432.00 SOD {15:07:12.00} UT,   80.5 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:        20.30d {+01h 21m 12s}   +8.55d {+08d 33' 11"}
SUN_DIST:         90.31 [deg]   Sun_angle= 5.6 [hr] (West of Sun)
MOON_POSTN:       16.90d {+01h 07m 36s}   +2.71d {+02d 42' 39"}
MOON_DIST:        83.97 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:        0.27,-26.93 [deg] galactic lon,lat of the burst
ECL_COORDS:      291.33,-17.91 [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 0.11% < P(seren) < 0.58%.