[vsnet-grb 340364] GCN/SWIFT_XRT_POSITION_UPDATE

[Bacodine]

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 21 Sep 17 14:41:52 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     773509,   Seg_Num: 0
GRB_RA:           26.8484d {+01h 47m 23.61s} (J2000),
                  27.1023d {+01h 48m 24.55s} (current),
                  26.1339d {+01h 44m 32.13s} (1950)
GRB_DEC:         +30.9069d {+30d 54' 24.8"} (J2000),
                 +30.9948d {+30d 59' 41.3"} (current),
                 +30.6577d {+30d 39' 27.8"} (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:  18017 TJD;   264 DOY;   17/09/21
IMG_START_TIME:  52247.00 SOD {14:30:47.00} UT,   118.5 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       178.90d {+11h 55m 37s}   +0.47d {+00d 28' 30"}
SUN_DIST:        138.69 [deg]   Sun_angle= 10.1 [hr] (West of Sun)
MOON_POSTN:      195.94d {+13h 03m 45s}   -2.34d {-02d 20' 17"}
MOON_DIST:       149.46 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:      136.85,-30.45 [deg] galactic lon,lat of the burst
ECL_COORDS:       36.18, 18.49 [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%.