XTE J1550-564: A superluminal ejection during the September 1998   outburst
  In 1998 September, the X-ray transient XTE J1550-564 underwent a major outburst in soft and hard X-rays, followed by a radio flare. Australian Long Baseline Array images obtained shortly after the peak in the radio flare showed evolving structure. The components observed have an apparent separation velocity of >2c. 
D. Hannikainen (1), D. Campbell-Wilson (2), R. Hunstead (2), V.   McIntyre (2 and 3), J. Lovell (3), J. Reynolds (3), T. Tzi...