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M87 is the first known radio galaxy to emit very high energy (VHE)gamma-rays. During a monitoring program of M87, a rapid flare in VHE gamma-rayswas detected by the MAGIC telescope in early 2008. The flux was found to bevariable on a timescale as short as 1 day, reaching 15% of the Crab Nebula fluxabove 350 GeV. In contrast, the flux at lower energies (150 GeV to 350 GeV) iscompatible with being constant. We present light curves and energy spectra, andargue that the observed day-scale flux variability favours the M87 core assource of the gamma-ray emission rather than the bright know HST-1 in the jetof M87.

The strong flaring activity of M87 in early 2008 as observed by the MAGIC telescope