Abstract

During the first observation cycle of the MAGIC telescope, 9 successful GRB follow-up observations were performed. For 2 bursts, the observation started even while the prompt emission was still ongoing. In none of these observations a significant excess over background could be detected. We present a direct determination of the MAGIC sensitivity in GRB observation mode from the Crab Nebula and the obtained upper limits for the 9 observations. At energies around 100GeV, MAGIC is currently the fastest and most sensitive GRB detector in the world.

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