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During its cycle-1 observation period, between April 2005 and March 2006, theMAGIC telescope was able to observe nine Gamma Ray Burst (GRB) events sincetheir early beginning. Other observations were performed during the followingmonths in the cycle-2 observation period. The observations, with an energythreshold spanning from 80 to 200 GeV, did not reveal any gamma ray emission.The computed upper limits are compatible with a power law extrapolation, whereintrinsic fluxes are evaluated taking into account the attenuation due to thescattering in the metagalactic radiation field.

MAGIC upper limits on the high energy emission from GRBs