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M87 is one of the closest (z=0.00436) extragalactic sources emitting atvery-high-energies (VHE, E > 100 GeV). The aim of this work is to locate theregion of the VHE gamma-ray emission and to describe the observed broadbandspectral energy distribution (SED) during the low VHE gamma-ray state. The datafrom M87 collected between 2012 and 2015 as part of a MAGIC monitoringprogramme are analysed and combined with multi-wavelength data from Fermi-LAT,Chandra, HST, EVN, VLBA and the Liverpool Telescope. The averaged VHE gamma-rayspectrum can be fitted from 100GeV to 10TeV with a simple power law with aphoton index of (-2.41 $\pm$ 0.07), while the integral flux above 300GeV is$(1.44 \pm 0.13) \times 10^{-12} cm^{-2} s^{-1}$. During the campaign between2012 and 2015, M87 is generally found in a low emission state at all observedwavelengths. The VHE gamma-ray flux from the present 2012-2015 M87 campaign isconsistent with a constant flux with some hint of variability ($\sim3\sigma$)on a daily timescale in 2013. The low-state gamma-ray emission likelyoriginates from the same region as the flare-state emission. Given thebroadband SED, both a leptonic synchrotron self Compton and a hybridphoto-hadronic model reproduce the available data well, even if the latter ispreferred. We note, however, that the energy stored in the magnetic field inthe leptonic scenario is very low suggesting a matter dominated emissionregion.

Monitoring of the radio galaxy M87 during a low emission state from 2012 to 2015 with MAGIC