[vsnet-grb 453846] GCN/SWIFT_XRT_POSITION_UPDATE

[Bacodine]

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 29 Jul 20 20:25:26 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     984929,   Seg_Num: 0
GRB_RA:          184.3775d {+12h 17m 30.59s} (J2000),
                 184.6320d {+12h 18m 31.67s} (current),
                 183.7572d {+12h 15m 01.73s} (1950)
GRB_DEC:         +45.5938d {+45d 35' 37.6"} (J2000),
                 +45.4796d {+45d 28' 46.5"} (current),
                 +45.8715d {+45d 52' 17.4"} (1950)
GRB_ERROR:       3.5 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  19059 TJD;   211 DOY;   20/07/29
IMG_START_TIME:  71044.00 SOD {19:44:04.00} UT,   358.9 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       129.56d {+08h 38m 15s}  +18.48d {+18d 28' 45"}
SUN_DIST:         52.64 [deg]   Sun_angle= -3.7 [hr] (East of Sun)
MOON_POSTN:      246.04d {+16h 24m 11s}  -19.73d {-19d 43' 53"}
MOON_DIST:        85.69 [deg]
MOON_ILLUM:      75 [%]
GAL_COORDS:      140.80, 70.34 [deg] galactic lon,lat of the burst
ECL_COORDS:      161.37, 42.59 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is inside galaxy NGC4242 (of total mag=11.00 and dia=4.80 arcmin).  
COMMENTS:        There is a 0.05% probability that this would happen by chance coincidence.  
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%.