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M87, the central galaxy of the Virgo cluster, is the first radio galaxydetected in the TeV regime. The structure of its jet, which is not pointingtoward the line of sight, is spatially resolved in X-ray (by Chandra), inoptical and in radio observations. Time correlation between the TeV flux andemission at other wavelengths provides a unique opportunity to localize thevery high energy gamma-ray emission process occurring in AGN. For 10 years, M87has been monitored in the TeV band by atmospheric Cherenkov telescopes. In2008, the three main atmospheric Cherenkov telescope observatories (H.E.S.S.,MAGIC and VERITAS) coordinated their observations in a joint campaign fromJanuary to May with a total observation time of approx. 120 hours. The campaignlargely overlapped with an intensive VLBA project monitoring the core of M87 at43 GHz every 5 days. In February, high TeV activities with rapid flares havebeen detected. Contemporaneously, M87 was observed with high spatial resolutioninstruments in X-rays (Chandra). We discuss the results of the jointobservation campaign in 2008.

A first joint M87 campaign in 2008 from radio to TeV gamma-rays