[vsnet-grb 318125] GCN/SWIFT_XRT_POSITION_UPDATE

[Bacodine]

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 18 Mar 17 15:41:43 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     743086,   Seg_Num: 0
GRB_RA:          284.3061d {+18h 57m 13.46s} (J2000),
                 284.5164d {+18h 58m 03.92s} (current),
                 283.6952d {+18h 54m 46.85s} (1950)
GRB_DEC:          +6.2994d {+06d 17' 57.8"} (J2000),
                  +6.3232d {+06d 19' 23.6"} (current),
                  +6.2320d {+06d 13' 55.3"} (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:  17830 TJD;    77 DOY;   17/03/18
IMG_START_TIME:  55850.00 SOD {15:30:50.00} UT,   177.4 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       358.38d {+23h 53m 31s}   -0.70d {-00d 42' 05"}
SUN_DIST:         74.05 [deg]   Sun_angle= 4.9 [hr] (West of Sun)
MOON_POSTN:      245.29d {+16h 21m 09s}  -16.19d {-16d 11' 14"}
MOON_DIST:        44.87 [deg]
MOON_ILLUM:      69 [%]
GAL_COORDS:       39.20,  1.59 [deg] galactic lon,lat of the burst
ECL_COORDS:      286.30, 28.93 [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%.