[vsnet-grb 289811] GCN/SWIFT_XRT_POSITION_UPDATE

[Bacodine]

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 25 Apr 16 23:44:57 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     684098,   Seg_Num: 0
GRB_RA:          280.3274d {+18h 41m 18.57s} (J2000),
                 280.6610d {+18h 42m 38.63s} (current),
                 279.3039d {+18h 37m 12.94s} (1950)
GRB_DEC:         -54.3603d {-54d 21' 37.0"} (J2000),
                 -54.3438d {-54d 20' 37.5"} (current),
                 -54.4078d {-54d 24' 27.9"} (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:  17503 TJD;   116 DOY;   16/04/25
IMG_START_TIME:  84881.00 SOD {23:34:41.00} UT,   509.7 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:        33.87d {+02h 15m 28s}  +13.58d {+13d 34' 54"}
SUN_DIST:        114.46 [deg]   Sun_angle= 7.5 [hr] (West of Sun)
MOON_POSTN:      257.00d {+17h 08m 00s}  -17.72d {-17d 43' 22"}
MOON_DIST:        40.89 [deg]
MOON_ILLUM:      88 [%]
GAL_COORDS:      341.31,-20.34 [deg] galactic lon,lat of the burst
ECL_COORDS:      277.01,-31.17 [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%.