[vsnet-grb 489278] GCN/SWIFT_XRT_POSITION_UPDATE

[Bacodine]

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 21 Jun 21 17:18:40 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     1057131,   Seg_Num: 0
GRB_RA:          238.7872d {+15h 55m 08.92s} (J2000),
                 239.2038d {+15h 56m 48.91s} (current),
                 237.8208d {+15h 51m 16.98s} (1950)
GRB_DEC:         -54.0613d {-54d 03' 40.6"} (J2000),
                 -54.1229d {-54d 07' 22.3"} (current),
                 -53.9150d {-53d 54' 54.0"} (1950)
GRB_ERROR:       2.0 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  19386 TJD;   172 DOY;   21/06/21
IMG_START_TIME:  61524.00 SOD {17:05:24.00} UT,   47.2 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:        90.60d {+06h 02m 24s}  +23.43d {+23d 26' 05"}
SUN_DIST:        141.37 [deg]   Sun_angle= -9.9 [hr] (East of Sun)
MOON_POSTN:      226.02d {+15h 04m 06s}  -15.36d {-15d 21' 27"}
MOON_DIST:        40.11 [deg]
MOON_ILLUM:      87 [%]
GAL_COORDS:      327.87, -0.34 [deg] galactic lon,lat of the burst
ECL_COORDS:      248.76,-32.90 [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%.