On March 19, 2008, Swift discovered a bright Gamma-Ray Burst (GRB 080319B). The image shows the X-ray afterglow as seen by the X-Ray Telescope (left) and the bright optical afterglow as observed by the Ultraviolet/Optical Telescope on board Swift.
Credit: NASA/Swift/Stefan Immler
The bright optical afterglow of GRB 080319B was seen by "Pi of the Sky", a Polish project that is monitoring Gamma-Ray Burst afterglows and other transient events in the sky. At peak, GRB 080319B reached a magnitude of 5.6 which is visible with the naked eye.
Credit: Pi of the Sky