[vsnet-grb 391495] GCN/SWIFT_XRT_POSITION_UPDATE

[Bacodine]

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 28 Dec 18 03:05:26 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     879909,   Seg_Num: 0
GRB_RA:           49.8113d {+03h 19m 14.71s} (J2000),
                  50.0736d {+03h 20m 17.67s} (current),
                  49.1215d {+03h 16m 29.16s} (1950)
GRB_DEC:         +13.1999d {+13d 11' 59.6"} (J2000),
                 +13.2679d {+13d 16' 04.5"} (current),
                 +13.0190d {+13d 01' 08.2"} (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:  18480 TJD;   362 DOY;   18/12/28
IMG_START_TIME:  10615.00 SOD {02:56:55.00} UT,   217.4 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       276.88d {+18h 27m 31s}  -23.29d {-23d 17' 07"}
SUN_DIST:        134.64 [deg]   Sun_angle= -8.9 [hr] (East of Sun)
MOON_POSTN:      172.16d {+11h 28m 39s}   +7.86d {+07d 51' 45"}
MOON_DIST:       118.74 [deg]
MOON_ILLUM:      64 [%]
GAL_COORDS:      169.30,-36.04 [deg] galactic lon,lat of the burst
ECL_COORDS:       50.90, -4.95 [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%.