Talk detail

Participant	Enderli, Maxime
Institution	La Sapienza Universita' di Roma - P.le Aldo Moro 5 - Rome - Lazio - Italy

Session	GB5	Accepted	Yes	Order	7	Time	17:20	20' + 5'
Talk	Oral abstract	Title	GRB 090510 as a "Genuine Short" Event: Merging Neutron Stars Forming a Fast Rotating Black Hole
Coauthors	Enderli, Maxime; Aimuratov, Y.; Bianco, Carlo L.; Kovacevic, Milos; Muccino, Marco; Pisani, Giovanni B.; Rueda, Jorge A.; Ruffini, R.; Wang, Y.
Abstract	The short-hard GRB 090510 (z = 0.903) has been studied within the fireshell model (Muccino et al. 2013). It was initially proposed to be an extreme binary driven hypernova (BdHN) exploding in an overdense circumburst environment. This analysis did not pass the test of the nesting BdHN Episode 3. On the ground of recent theoretical developments in the study of binary neutron star mergers, this interpretation is consequently updated. Reanalyzing Fermi/GBM and LAT data, we show that GRB 090510 is fully consistent with being a member of the "family 2 short GRBs", the family of GRBs that originate in a compact object merger leading to black hole formation. We find an isotropic energy E_iso of 3.95 x 10^52 erg, a baryon load B = 5.54 x 10^-5, and an average circumburst density <n_CBM> = 8.7 x 10^-6 cm^-3. The GeV emission is particularly relevant to the identification to this family. The position of GRB 090510 in the E_peak - E_iso diagram, far from the "Amati correlation" for long GRBs but in line with the short GRB correlation, also favors this interpretation. Interestingly, the redshift theoretically derived from the fireshell analysis is in full agreement with the spectroscopic redshift determined from optical observations.
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