[vsnet-grb 201495] GCN/SWIFT_XRT_IMAGE

[Bacodine]

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 27 Apr 13 07:51:00 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     554620,   Seg_Num: 0
GRB_RA:          173.1362d {+11h 32m 32.6s} (J2000),
                 173.3114d {+11h 33m 14.7s} (current),
                 172.4773d {+11h 29m 54.5s} (1950)
GRB_DEC:         +27.7129d {+27d 42' 46.4"} (J2000),
                 +27.6393d {+27d 38' 21.3"} (current),
                 +27.9891d {+27d 59' 20.8"} (1950)
GRB_ERROR:       4.3 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       313 [cnts]
IMG_START_DATE:  16409 TJD;   117 DOY;   13/04/27
IMG_START_TIME:  28217.70 SOD {07:50:17.70} UT,   140.2 [sec] since BAT Trigger Time
CENTROID_X:      268.46,  raw= 268  [pixels]
CENTROID_Y:      276.68,  raw= 277  [pixels]
ROLL:            310.40 [deg]
GAIN:            8
MODE:            2, Short Image mode
WAVEFORM:        134
EXPO_TIME:       0.10 [sec]
GRB_POS_XRT_Y:   -50.24
GRB_POS_XRT_Z:   -83.05
IMAGE_URL:       sw00554620000msxps_rw.img
SUN_POSTN:        34.87d {+02h 19m 30s}  +13.92d {+13d 55' 18"}
SUN_DIST:        122.12 [deg]   Sun_angle= -9.2 [hr] (East of Sun)
MOON_POSTN:      235.71d {+15h 42m 49s}  -18.78d {-18d 46' 36"}
MOON_DIST:        76.15 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:      206.46, 72.50 [deg] galactic lon,lat of the burst
ECL_COORDS:      162.21, 22.62 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.  
COMMENTS:        The object found at this position is either a very bright burst or a cosmic ray hit.  
COMMENTS:        Examine the XRT Image to differentiate (CRs are much more compact); see examples at:  
COMMENTS:        http://www.swift.psu.edu/xrt/XRT_Postage_Stamp_Image_Photo_Gallery.htm .