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We have constructed an optical photometer with microsecond time resolution,which is currently being operated on one of the H.E.S.S. telescopes. H.E.S.S.is an array of four Cherenkov telescopes, each with a 107 m^2 mirror, locatedin the Khomas highland in Namibia. In its normal mode of operation H.E.S.S.observes Cherenkov light from air showers generated by very high energygamma-rays in the upper atmosphere. Our detector consists of sevenphotomultipliers, one in the center to record the lightcurve from the targetand six concentric photomultipliers as a veto system to reject disturbingsignals e.g. from meteorites or lightning at the horizon. The data acquisitionsystem has been designed to continuously record the signals with zero deadtime.The Crab pulsar has been observed to verify the performance of the instrumentand the GPS timing system. Compact galactic targets were observed to search forflares on timescales of a few microseconds to ~ 100 milliseconds. The designand sensitivity of the instrument as well as the data analysis method arepresented.

Microsecond Time Resolution Optical Photometry using a H.E.S.S. Cherenkov Telescope