NASA's Swift satellite, Hubble Space Telescope, and Chandra X-ray Observatory have teamed up to study one of the most puzzling cosmic blasts ever observed. More than a week later, high-energy radiation continues to brighten and fade from its location. Astronomers say they have never seen such a bright, variable, high-energy, long-lasting burst before. Usually, gamma-ray bursts mark the destruction of a massive star, and flaring emission from these events never lasts more than a few hours. This brightness increase, which is called "relativistic beaming," occurs when matter moving close to the speed of light is viewed nearly head on. Astronomers plan additional Hubble observations to see if the galaxy's core changes brightness.