[vsnet-grb 486298] GCN/SWIFT_XRT_POSITION_UPDATE

[Bacodine]

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 27 May 21 08:41:09 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     1051453,   Seg_Num: 0
GRB_RA:          172.3216d {+11h 29m 17.18s} (J2000),
                 172.6054d {+11h 30m 25.30s} (current),
                 171.6571d {+11h 26m 37.69s} (1950)
GRB_DEC:         +31.6242d {+31d 37' 27.1"} (J2000),
                 +31.5061d {+31d 30' 21.8"} (current),
                 +31.8999d {+31d 53' 59.5"} (1950)
GRB_ERROR:       3.8 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  19361 TJD;   147 DOY;   21/05/27
IMG_START_TIME:  28837.00 SOD {08:00:37.00} UT,   3168.1 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:        64.43d {+04h 17m 42s}  +21.36d {+21d 21' 21"}
SUN_DIST:         93.29 [deg]   Sun_angle= -7.2 [hr] (East of Sun)
MOON_POSTN:      258.01d {+17h 12m 02s}  -23.72d {-23d 43' 13"}
MOON_DIST:        98.49 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      193.90, 71.58 [deg] galactic lon,lat of the burst
ECL_COORDS:      159.65, 25.84 [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 0.58% < P(seren) < 1.1%.