  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+-0.7_stat+-2.2_sys)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+-0.2_stat+-0.2_sys. The source is point-like within the angular
resolution of the telescope.
