[vsnet-grb 364432] GCN/SWIFT_XRT_POSITION_UPDATE

[Bacodine]

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 25 Apr 18 06:59:58 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     828672,   Seg_Num: 0
GRB_RA:           64.4517d {+04h 17m 48.40s} (J2000),
                  64.6267d {+04h 18m 30.41s} (current),
                  63.9741d {+04h 15m 53.77s} (1950)
GRB_DEC:         -32.9519d {-32d 57' 06.8"} (J2000),
                 -32.9081d {-32d 54' 29.0"} (current),
                 -33.0730d {-33d 04' 22.8"} (1950)
GRB_ERROR:       2.2 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  18233 TJD;   115 DOY;   18/04/25
IMG_START_TIME:  24616.00 SOD {06:50:16.00} UT,   234.2 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:        32.75d {+02h 11m 01s}  +13.20d {+13d 11' 57"}
SUN_DIST:         55.25 [deg]   Sun_angle= -2.1 [hr] (East of Sun)
MOON_POSTN:      158.52d {+10h 34m 05s}  +11.34d {+11d 20' 23"}
MOON_DIST:        99.36 [deg]
MOON_ILLUM:      76 [%]
GAL_COORDS:      233.47,-45.40 [deg] galactic lon,lat of the burst
ECL_COORDS:       52.88,-53.15 [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%.