In March 2009, NASA's Swift observed the supernova SN 2009bb in the spiral galaxy NGC 3278. The explosion is apparent in visible light, but not at ultraviolet and X-ray energies, and satellites recorded no gamma-ray burst. Nevertheless, particle jets reaching 85 percent the speed of light accompanied the explosion. Astronomers believe these jets are powered by a "central engine" — likely a newborn black hole at the star's center, a scenario that also fits most gamma-ray bursts.