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One fundamental question about pulsars concerns the mechanism of their pulsedelectromagnetic emission. Measuring the high-end region of a pulsar's spectrumwould shed light on this question. By developing a new electronic trigger, welowered the threshold of the Major Atmospheric gamma-ray Imaging Cherenkov(MAGIC) telescope to 25 GeV. In this configuration, we detected pulsedgamma-rays from the Crab pulsar that were greater than 25 GeV, revealing arelatively high cutoff energy in the phase-averaged spectrum. This indicatesthat the emission occurs far out in the magnetosphere, hence excluding thepolar-cap scenario as a possible explanation of our measurement. The highcutoff energy also challenges the slot-gap scenario.

Observation of Pulsed Gamma-rays Above 25 GeV from the Crab Pulsar with MAGIC