[vsnet-grb 430191] GCN/SWIFT_XRT_POSITION_UPDATE

[Bacodine]

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 20 Dec 19 13:49:38 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     945344,   Seg_Num: 0
GRB_RA:          281.3799d {+18h 45m 31.17s} (J2000),
                 281.5810d {+18h 46m 19.44s} (current),
                 280.8763d {+18h 43m 30.32s} (1950)
GRB_DEC:         +26.6557d {+26d 39' 20.5"} (J2000),
                 +26.6778d {+26d 40' 40.1"} (current),
                 +26.6020d {+26d 36' 07.0"} (1950)
GRB_ERROR:       2.3 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  18837 TJD;   354 DOY;   19/12/20
IMG_START_TIME:  48756.00 SOD {13:32:36.00} UT,   178.2 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       268.23d {+17h 52m 55s}  -23.43d {-23d 25' 33"}
SUN_DIST:         51.74 [deg]   Sun_angle= -0.9 [hr] (East of Sun)
MOON_POSTN:      197.11d {+13h 08m 26s}   -1.61d {-01d 36' 18"}
MOON_DIST:        85.79 [deg]
MOON_ILLUM:      35 [%]
GAL_COORDS:       56.45, 13.01 [deg] galactic lon,lat of the burst
ECL_COORDS:      285.75, 49.47 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        There is a bright star (mag=4.83) 7.46 arcmin from the XRT position.  
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%.