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Stereoscopic observations of gamma rays at the Whipple observatory

Authors:	F Krennrich CW Akerlof JH Buckley J Bussóns-Gordo DA Carter-Lewis MF Cawley MA Catanese V Connaughton DJ Fegan JP Finley JA Gaidos KH Harris AM Hillas RC Lamb MJ Lang G Mohanty J Quinn AJ Rodgers HJ Rose AC Rovero MS Schubnell GH Sembroski TC Weekes C Wilson

Institution:	^a Department of Physics and Astronomy, Iowa State University, Ames, IA 50011-3160, USA ^b Randall Laboratory of Physics, University of Michigan, Ann Arbor, MI 48109-1120, USA ^c Department of Physics, University of Leeds, Leeds, LS2 9JT, Yorkshire, England, UK ^d Fred Lawrence Whipple Observatory, Harvard-Smithsonian CfA, P.O. Box 97, Amado, AZ 85645-0097, USA ^e Physics Department, St.Patrick's College, Maynooth, Country Kildare, Ireland ^f Physics Department, University College, Dublin 4, Ireland ^g Department of Physics, Purdue University, West Lafayette, IN 47907, USA ^h Department of Physics, University College, Galway, Ireland ⁱ Instituto de Astronomia y Fisica del Espacio, Buenos Aires, Argentina

Abstract:	Observations of photons at E ≥ 550 GeV from the Crab Nebula are presented and used to assess the potential of multi-telescope systems for γ-ray astronomy. The Whipple observatory 10 m and 8 m imaging atmospheric erenkov telescopes have been used to provide a stereoscopic view of air showers to make a more complete measurement of air shower parameters. Here we present a measurement of the spread in the arrival direction of primary γ-rays originating from a point source. The data show that the shower arrival direction can be reconstructed with an accuracy of σ = 0.°14.

Keywords:	Gamma Rays General Instruments Observations Crab Nebula
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