[vsnet-grb 496301] GCN/SWIFT_XRT_POSITION_UPDATE

[Bacodine]

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 20 Aug 21 17:57:29 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     1069551,   Seg_Num: 0
GRB_RA:           20.6392d {+01h 22m 33.40s} (J2000),
                  20.9199d {+01h 23m 40.77s} (current),
                  19.9911d {+01h 19m 57.86s} (1950)
GRB_DEC:          +4.6078d {+04d 36' 28.0"} (J2000),
                  +4.7204d {+04d 43' 13.4"} (current),
                  +4.3467d {+04d 20' 48.1"} (1950)
GRB_ERROR:       1.9 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  19446 TJD;   232 DOY;   21/08/20
IMG_START_TIME:  63952.00 SOD {17:45:52.00} UT,   471.3 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       150.11d {+10h 00m 26s}  +12.19d {+12d 11' 24"}
SUN_DIST:        126.74 [deg]   Sun_angle= 8.6 [hr] (West of Sun)
MOON_POSTN:      308.80d {+20h 35m 12s}  -23.12d {-23d 07' 18"}
MOON_DIST:        75.57 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      137.43,-57.39 [deg] galactic lon,lat of the burst
ECL_COORDS:       20.80, -3.79 [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 0.58% < P(seren) < 1.1%.