*4.2. GRB 201216C*

GRB 201216C was detected by MAGIC [77] after receiving a trigger from *Swift*-BAT [78]. This GRB belongs to the long class as well, and similar to GRB 180720B and GRB 190114C, was very bright, having *<sup>E</sup>*iso∼4.7 <sup>×</sup> <sup>10</sup><sup>53</sup> erg in the 10 keV to 1 MeV energy range. GRB 201216C was detected also in optical, where large extinction is present, and its redshift has been estimated to be *z* = 1.1 [79]. MAGIC started the observation of the burst about one minute after the *Swift* trigger, for a total of 2.2 h of exposure. The source was detected with a significance of 5.9*σ* (post trial) using the first 20 min of data, which makes this the farthest source ever detected. The spectrum in the same time interval can be well described by a power law extending from 50 to 200 GeV, while the energy flux light curve decays monotonically with time [80].
