[vsnet-grb 121817] GCN/SWIFT_XRT_POSITION_UPDATE

[Bacodine]

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 18 Apr 10 21:24:39 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     419797,   Seg_Num: 0
GRB_RA:          256.3634d {+17h 05m 27.21s} (J2000),
                 256.4840d {+17h 05m 56.16s} (current),
                 255.7778d {+17h 03m 06.67s} (1950)
GRB_DEC:         +11.4618d {+11d 27' 42.4"} (J2000),
                 +11.4483d {+11d 26' 54.0"} (current),
                 +11.5288d {+11d 31' 43.7"} (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:  15304 TJD;   108 DOY;   10/04/18
IMG_START_TIME:  76393.00 SOD {21:13:13.00} UT,   185.0 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:        26.70d {+01h 46m 48s}  +11.02d {+11d 01' 22"}
SUN_DIST:        125.68 [deg]   Sun_angle= 8.7 [hr] (West of Sun)
MOON_POSTN:       81.06d {+05h 24m 15s}  +25.20d {+25d 11' 51"}
MOON_DIST:       143.08 [deg]
MOON_ILLUM:      20 [%]
GAL_COORDS:       31.46, 28.67 [deg] galactic lon,lat of the burst
ECL_COORDS:      253.79, 34.14 [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%.