Needs for a new GRB classification following the fireshell model: "genuine short", "disguised short" and "long" GRBs

Thanks to the observations by the Swift and Fermi satellites, it became clear that the traditional classification of GRBs in two classes (“short/hard” and “long/soft”) is, at best, misleading. Following the theoretical approach of the fireshell model, we discuss a new GRB classification based on intrinsic physical properties which includes at least three classes: “genuine short”, “disguised short” and “long”, whose names resembles the traditional ones just for simplicity. Observational facts supporting this classification are presented, including the implications for the “Ep;i–Eiso” correlation.