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Gamma-ray bursts (GRBs) are explosive transient events occurring atcosmological distances, releasing a large amount of energy as electromagneticradiation over several energy bands. We report the detection of the longGRB~201216C by the MAGIC telescopes. The source is located at $z=1.1$ and thusit is the farthest one detected at very high energies. The emission above\SI{70}{\GeV} of GRB~201216C is modelled together with multi-wavelength datawithin a synchrotron and synchrotron-self Compton (SSC) scenario. We find thatSSC can explain the broadband data well from the optical to thevery-high-energy band. For the late-time radio data, a different component isneeded to account for the observed emission. Differently from previous GRBsdetected in the very-high-energy range, the model for GRB~201216C stronglyfavors a wind-like medium. The model parameters have values similar to thosefound in past studies of the afterglows of GRBs detected up to GeV energies.

MAGIC detection of GRB 201216C at $z=1.1$