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The Rapid Telescopes for Optical Response (RAPTOR) experiment is a spatiallydistributed system of autonomous robotic telescopes that is designed to monitorthe sky for optical transients. The core of the system is composed of twotelescope arrays, separated by 38 kilometers, that stereoscopically view thesame 1500 square-degree field with a wide-field imaging array and a central 4square-degree field with a more sensitive narrow-field "fovea" imager. Coupledto each telescope array is a real-time data analysis pipeline that is designedto identify interesting transients on timescales of seconds and, when acelestial transient is identified, to command the rapidly slewing roboticmounts to point the narrow-field ``fovea'' imagers at the transient. The twonarrow-field telescopes then image the transient with higher spatial resolutionand at a faster cadence to gather light curve information. Each "fovea" cameraalso images the transient through a different filter to provide colorinformation. This stereoscopic monitoring array is supplemented by a rapidlyslewing telescope with a low resolution spectrograph for follow-up observationsof transients and a sky patrol telescope that nightly monitors about 10,000square-degrees for variations, with timescales of a day or longer, to a depthabout 100 times fainter. In addition to searching for fast transients, we willuse the data stream from RAPTOR as a real-time sentinel for recognizingimportant variations in known sources. Altogether, the RAPTOR project aims toconstruct a new type of system for discovery in optical astronomy--one thatexplores the time domain by "mining the sky in real time".Comment: 11 pages, To appear in the Proceedings of the SPIE, Volume 484

<title>The RAPTOR experiment: a system for monitoring the optical sky in real time</title>