[vsnet-grb 202995] GCN/SWIFT_XRT_POSITION_UPDATE

[Bacodine]

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 15 May 13 01:33:19 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     555880,   Seg_Num: 0
GRB_RA:          283.4404d {+18h 53m 45.69s} (J2000),
                 283.7122d {+18h 54m 50.93s} (current),
                 282.4221d {+18h 49m 41.30s} (1950)
GRB_DEC:         -54.2794d {-54d 16' 45.8"} (J2000),
                 -54.2619d {-54d 15' 42.9"} (current),
                 -54.3417d {-54d 20' 30.1"} (1950)
GRB_ERROR:       3.1 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  16427 TJD;   135 DOY;   13/05/15
IMG_START_TIME:  4967.00 SOD {01:22:47.00} UT,   89.2 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:        52.03d {+03h 28m 08s}  +18.87d {+18d 52' 07"}
SUN_DIST:        127.24 [deg]   Sun_angle= 8.6 [hr] (West of Sun)
MOON_POSTN:      110.35d {+07h 21m 24s}  +17.33d {+17d 20' 01"}
MOON_DIST:       142.72 [deg]
MOON_ILLUM:      21 [%]
GAL_COORDS:      341.97,-22.05 [deg] galactic lon,lat of the burst
ECL_COORDS:      279.13,-31.27 [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%.