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We present the results of a long M87 monitoring campaign in very high energy$\gamma$-rays with the MAGIC-I Cherenkov telescope. We aim to model thepersistent non-thermal jet emission by monitoring and characterizing the veryhigh energy $\gamma$-ray emission of M87 during a low state. A total of 150\,hof data were taken between 2005 and 2007 with the single MAGIC-I telescope, outof which 128.6\,h survived the data quality selection. We also collected datain the X-ray and \textit{Fermi}--LAT bands from the literature (partiallycontemporaneous). No flaring activity was found during the campaign. The sourcewas found to be in a persistent low-emission state, which was at a confidencelevel of $7\sigma$. We present the spectrum between 100\,GeV and 2\,TeV, whichis consistent with a simple power law with a photon index $\Gamma=2.21\pm0.21$and a flux normalization at 300\,GeV of $(7.7\pm1.3) \times 10^{-8}$ TeV$^{-1}$s$^{-1}$ m$^{-2}$. The extrapolation of the MAGIC spectrum into the GeV energyrange matches the previously published \textit{Fermi}--LAT spectrum well,covering a combined energy range of four orders of magnitude with the samespectral index. We model the broad band energy spectrum with a spine layermodel, which can satisfactorily describe our data.

MAGIC observations of the giant radio galaxy M87 in a low-emission state between 2005 and 2007