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VHE gamma-ray observations of Markarian 501

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arxiv astro-ph/9906150 v1 pith:JBZB5TRJ submitted 1999-06-08 astro-ph

classification astro-ph
keywords observationsgamma-raymarkarianduringmadex-rayatmosphericbeen
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Markarian 501, a nearby (z=0.033) X-ray selected BL Lacertae object, is a well established source of Very High Energy (VHE, E>=300 GeV) gamma rays. Dramatic variability in its gamma-ray emission on time-scales from years to as short as two hours has been detected. Multiwavelength observations have also revealed evidence that the VHE gamma-ray and hard X-ray fluxes may be correlated. Here we present results of observations made with the Whipple Collaboration's 10 m Atmospheric Cerenkov Imaging Telescope during 1999 and discuss them in the context of observations made on Markarian 501 during the period from 1996-1998.

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