[vsnet-grb 361831] GCN/SWIFT_XRT_POSITION_UPDATE

[Bacodine]

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 02 Apr 18 09:52:27 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     821103,   Seg_Num: 0
GRB_RA:          251.9336d {+16h 47m 44.06s} (J2000),
                 252.1933d {+16h 48m 46.39s} (current),
                 251.2227d {+16h 44m 53.44s} (1950)
GRB_DEC:         -14.9677d {-14d 58' 03.7"} (J2000),
                 -14.9990d {-14d 59' 56.3"} (current),
                 -14.8797d {-14d 52' 46.9"} (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:  18210 TJD;    92 DOY;   18/04/02
IMG_START_TIME:  35224.00 SOD {09:47:04.00} UT,   124.7 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:        11.60d {+00h 46m 25s}   +4.98d {+04d 58' 57"}
SUN_DIST:        119.67 [deg]   Sun_angle= 8.0 [hr] (West of Sun)
MOON_POSTN:      215.41d {+14h 21m 37s}   -8.78d {-08d 46' 43"}
MOON_DIST:        36.48 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:        4.10, 18.91 [deg] galactic lon,lat of the burst
ECL_COORDS:      252.42,  7.38 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        There is a bright star (mag=6.03) 10.94 arcmin from the XRT position.  
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%.