[vsnet-grb 485018] GCN/SWIFT_XRT_POSITION_UPDATE

[Bacodine]

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 17 May 21 05:39:52 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     1048783,   Seg_Num: 0
GRB_RA:          358.2246d {+23h 52m 53.90s} (J2000),
                 358.5012d {+23h 54m 00.29s} (current),
                 357.5758d {+23h 50m 18.18s} (1950)
GRB_DEC:         -39.1022d {-39d 06' 07.9"} (J2000),
                 -38.9833d {-38d 58' 59.7"} (current),
                 -39.3804d {-39d 22' 49.5"} (1950)
GRB_ERROR:       2.2 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  19351 TJD;   137 DOY;   21/05/17
IMG_START_TIME:  19766.00 SOD {05:29:26.00} UT,   84.4 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:        54.25d {+03h 37m 00s}  +19.38d {+19d 22' 56"}
SUN_DIST:         78.23 [deg]   Sun_angle= 3.7 [hr] (West of Sun)
MOON_POSTN:      119.06d {+07h 56m 14s}  +24.68d {+24d 40' 39"}
MOON_DIST:       128.44 [deg]
MOON_ILLUM:      25 [%]
GAL_COORDS:      344.78,-72.91 [deg] galactic lon,lat of the burst
ECL_COORDS:      340.61,-34.69 [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%.