[vsnet-grb 417278] GCN/SWIFT_XRT_POSITION_UPDATE

[Bacodine]

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 21 Aug 19 17:33:44 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     921722,   Seg_Num: 0
GRB_RA:          250.0546d {+16h 40m 13.10s} (J2000),
                 250.3757d {+16h 41m 30.15s} (current),
                 249.2383d {+16h 36m 57.19s} (1950)
GRB_DEC:         -34.0071d {-34d 00' 25.5"} (J2000),
                 -34.0441d {-34d 02' 38.7"} (current),
                 -33.9103d {-33d 54' 36.9"} (1950)
GRB_ERROR:       3.6 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  18716 TJD;   233 DOY;   19/08/21
IMG_START_TIME:  61922.00 SOD {17:12:02.00} UT,   118.1 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       150.54d {+10h 02m 10s}  +12.03d {+12d 02' 05"}
SUN_DIST:        104.78 [deg]   Sun_angle= -6.7 [hr] (East of Sun)
MOON_POSTN:       35.85d {+02h 23m 23s}   +9.11d {+09d 06' 33"}
MOON_DIST:       139.70 [deg]
MOON_ILLUM:      69 [%]
GAL_COORDS:      347.69,  8.32 [deg] galactic lon,lat of the burst
ECL_COORDS:      253.21,-11.72 [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:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.58% < P(seren) < 1.1%.