[vsnet-grb 200980] GCN/SWIFT_XRT_POSITION_UPDATE

[Bacodine]

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 20 Apr 13 07:49:06 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     553977,   Seg_Num: 0
GRB_RA:          196.1060d {+13h 04m 25.43s} (J2000),
                 196.2416d {+13h 04m 57.97s} (current),
                 195.5949d {+13h 02m 22.76s} (1950)
GRB_DEC:         +59.4241d {+59d 25' 26.7"} (J2000),
                 +59.3530d {+59d 21' 10.7"} (current),
                 +59.6919d {+59d 41' 30.9"} (1950)
GRB_ERROR:       2.6 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  16402 TJD;   110 DOY;   13/04/20
IMG_START_TIME:  27652.00 SOD {07:40:52.00} UT,   742.5 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:        28.29d {+01h 53m 10s}  +11.61d {+11d 36' 40"}
SUN_DIST:        108.37 [deg]   Sun_angle= -11.2 [hr] (East of Sun)
MOON_POSTN:      141.43d {+09h 25m 44s}   +9.59d {+09d 35' 33"}
MOON_DIST:        64.34 [deg]
MOON_ILLUM:      67 [%]
GAL_COORDS:      119.85, 57.63 [deg] galactic lon,lat of the burst
ECL_COORDS:      156.45, 57.78 [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%.