[vsnet-grb 201540] GCN/SWIFT_XRT_POSITION_UPDATE

[Bacodine]

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 27 Apr 13 13:43:55 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     554635,   Seg_Num: 0
GRB_RA:          314.8987d {+20h 59m 35.68s} (J2000),
                 315.0911d {+21h 00m 21.86s} (current),
                 314.1754d {+20h 56m 42.09s} (1950)
GRB_DEC:         -22.5466d {-22d 32' 47.7"} (J2000),
                 -22.4942d {-22d 29' 39.0"} (current),
                 -22.7419d {-22d 44' 30.7"} (1950)
GRB_ERROR:       2.4 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  16409 TJD;   117 DOY;   13/04/27
IMG_START_TIME:  48247.00 SOD {13:24:07.00} UT,   205.2 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:        35.11d {+02h 20m 26s}  +14.00d {+13d 59' 57"}
SUN_DIST:         86.39 [deg]   Sun_angle= 5.3 [hr] (West of Sun)
MOON_POSTN:      239.51d {+15h 58m 03s}  -19.23d {-19d 14' 04"}
MOON_DIST:        69.92 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:       24.37,-37.65 [deg] galactic lon,lat of the burst
ECL_COORDS:      310.89, -5.25 [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%.