Could GRB170817A be really correlated to a NS-NS merging?

by Daniele Fargion (Physics Department & INFN Rome1)

Monday 27 Nov 2017, 15:00 → 16:00 Europe/Rome

Aula Rasetti (Dipartimento di Fisica - Ed. G.Marconi)

The GW 170817 and GRB170817A occurred within a short time almost in the same sky windows. It has been the nearest Short GRB observed, the first NS NS collapse merging, the softer SGRB, the weakest one and the first GRB GW correlated event within just a year or even a month of detection. An amazing lucky event hard to be accepted at first view. Moreover the huge spread (8 order of magnitude) in apparent luminosity among thousands GRB call for a thin blazing jet source able to embrace (with the same NS-NS or NS-BH collapse) the vast variability observed by its geometry (in axis , off axis) view. May the case of GRB170817 be associated to such an extreme off axis detection? Many authors and us agree on this possibility. However there maybe an additional unexpected novel geometry in GRB explosion making theGRB observation at near distance much more probable: a twin gamma disk-cone blazing in wide solid angles in addition to the inner thin precessing jets event.