[vsnet-grb 482079] GCN/SWIFT_XRT_POSITION_UPDATE

[Bacodine]

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 21 Apr 21 00:48:07 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     1044426,   Seg_Num: 0
GRB_RA:          104.8756d {+06h 59m 30.14s} (J2000),
                 105.1584d {+07h 00m 38.01s} (current),
                 104.2117d {+06h 56m 50.81s} (1950)
GRB_DEC:          +4.9216d {+04d 55' 17.7"} (J2000),
                  +4.8909d {+04d 53' 27.1"} (current),
                  +4.9915d {+04d 59' 29.4"} (1950)
GRB_ERROR:       3.7 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  19325 TJD;   111 DOY;   21/04/21
IMG_START_TIME:  1873.00 SOD {00:31:13.00} UT,   222.7 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:        29.01d {+01h 56m 03s}  +11.87d {+11d 52' 24"}
SUN_DIST:         75.46 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:      133.53d {+08h 54m 08s}  +22.11d {+22d 06' 22"}
MOON_DIST:        32.40 [deg]
MOON_ILLUM:      58 [%]
GAL_COORDS:      209.46,  4.03 [deg] galactic lon,lat of the burst
ECL_COORDS:      105.58,-17.72 [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:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.11% < P(seren) < 0.58%.