Observation of VHE gamma-rays from Cassiopeia A with the MAGIC telescope
Abstract
We searched for very high energy (VHE) gamma-ray emission from the supernova remnant Cassiopeia A. The shell-type supernova remnant Cassiopeia A was observed with the 17 meter MAGIC telescope between July 2006 and January 2007 for a total time of 47 hours. The source was detected above an energy of 250 GeV with a significance of 5.2sigma and a photon flux above 1 TeV of (7.3+-0.7stat+-2.2sys)10-13 cm-2s-1. The photon spectrum is compatible with a power law dN/dE = A E-Gamma with a photon index Gamma=2.3+-0.2stat+-0.2sys. The source is point-like within the angular resolution of the telescope.
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