[vsnet-grb 202020] GCN/SWIFT_XRT_POSITION_UPDATE

[Bacodine]

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 02 May 13 18:05:01 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     554996,   Seg_Num: 0
GRB_RA:          138.5689d {+09h 14m 16.53s} (J2000),
                 138.7396d {+09h 14m 57.50s} (current),
                 137.9284d {+09h 11m 42.82s} (1950)
GRB_DEC:          -0.1232d {-00d 07' 23.5"} (J2000),
                  -0.1789d {-00d 10' 44.1"} (current),
                  +0.0845d {+00d 05' 04.2"} (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:  16414 TJD;   122 DOY;   13/05/02
IMG_START_TIME:  64335.00 SOD {17:52:15.00} UT,   104.6 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:        40.05d {+02h 40m 11s}  +15.59d {+15d 35' 07"}
SUN_DIST:         98.42 [deg]   Sun_angle= -6.6 [hr] (East of Sun)
MOON_POSTN:      316.90d {+21h 07m 37s}  -10.95d {-10d 56' 58"}
MOON_DIST:       168.72 [deg]
MOON_ILLUM:      47 [%]
GAL_COORDS:      231.20, 31.23 [deg] galactic lon,lat of the burst
ECL_COORDS:      141.04,-15.38 [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 1.1% < P(seren) < 2.8%.