[vsnet-grb 319610] GCN/SWIFT_XRT_POSITION_UPDATE

[Bacodine]

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 30 Mar 17 22:53:12 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     744773,   Seg_Num: 0
GRB_RA:          283.3308d {+18h 53m 19.39s} (J2000),
                 283.5740d {+18h 54m 17.76s} (current),
                 282.6253d {+18h 50m 30.08s} (1950)
GRB_DEC:         -13.4312d {-13d 25' 52.3"} (J2000),
                 -13.4089d {-13d 24' 31.9"} (current),
                 -13.4937d {-13d 29' 37.4"} (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:  17842 TJD;    89 DOY;   17/03/30
IMG_START_TIME:  81496.00 SOD {22:38:16.00} UT,   504.7 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:         9.58d {+00h 38m 20s}   +4.13d {+04d 07' 39"}
SUN_DIST:         87.09 [deg]   Sun_angle= 5.7 [hr] (West of Sun)
MOON_POSTN:       48.03d {+03h 12m 08s}  +12.69d {+12d 41' 22"}
MOON_DIST:       126.01 [deg]
MOON_ILLUM:      11 [%]
GAL_COORDS:       21.14, -6.49 [deg] galactic lon,lat of the burst
ECL_COORDS:      283.14,  9.40 [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 0.11% < P(seren) < 0.58%.