Pi of the Sky is an astronomical survey aimed specifically at discovering optical transients associated with gamma-ray bursts. It naturally also records other types of transients of interest.
It is performed by a robotic-telescope setup designed for the purpose. The aim is to be watching a significant portion of the night sky over every suitable night, and thus catch any gamma-ray bursts that happen to occur then and there. A pilot with two such telescopes, with CCD cameras, operated from 2004 to 2009, with a four-camera system going into service in Spain in 2010, and sixteen cameras in 2013, able to view an 80°×80° field of view.