[vsnet-grb 475901] GCN/SWIFT_XRT_POSITION_UPDATE

[Bacodine]

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 26 Feb 21 05:07:34 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     1034721,   Seg_Num: 0
GRB_RA:          124.1144d {+08h 16m 27.45s} (J2000),
                 124.5384d {+08h 18m 09.22s} (current),
                 123.1077d {+08h 12m 25.84s} (1950)
GRB_DEC:         +57.5838d {+57d 35' 01.6"} (J2000),
                 +57.5174d {+57d 31' 02.5"} (current),
                 +57.7379d {+57d 44' 16.5"} (1950)
GRB_ERROR:       2.1 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  19271 TJD;    57 DOY;   21/02/26
IMG_START_TIME:  17153.00 SOD {04:45:53.00} UT,   115.8 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       339.49d {+22h 37m 58s}   -8.63d {-08d 38' 02"}
SUN_DIST:        124.18 [deg]   Sun_angle= -9.7 [hr] (East of Sun)
MOON_POSTN:      146.99d {+09h 47m 58s}  +18.13d {+18d 08' 04"}
MOON_DIST:        42.76 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:      159.94, 33.91 [deg] galactic lon,lat of the burst
ECL_COORDS:      112.03, 36.73 [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%.