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On the basis of the recent understanding of GRB050315 and GRB060218, wereturn to GRB970228, the first Gamma-Ray Burst (GRB) with detected afterglow.We proposed it as the prototype for a new class of GRBs with "an occasionalsofter extended emission lasting tenths of seconds after an initial spikelikeemission". Detailed theoretical computation of the GRB970228 light curves inselected energy bands for the prompt emission are presented and compared withobservational BeppoSAX data. From our analysis we conclude that GRB970228 andlikely the ones of the above mentioned new class of GRBs are "canonical GRBs"have only one peculiarity: they exploded in a galactic environment, possiblythe halo, with a very low value of CBM density. Here we investigate howGRB970228 unveils another peculiarity of this class of GRBs: they do notfulfill the "Amati relation". We provide a theoretical explanation within thefireshell model for the apparent absence of such correlation for the GRBsbelonging to this new class.

GRB970228 and the class of GRBs with an initial spikelike emission: do they follow the Amati relation?