Talk detail

Participant	Penacchioni, Ana Virginia
Institution	La Sapienza University of Rome - Piazzale Aldo Moro 5 - Rome - Rome - Italy

Session	GRB1	Accepted		Order	Time
Talk	Oral abstract	Title	GRB 110709B, a new member of the proto-black hole family
Co-authors
Abstract	GRB 110709B is a very peculiar source, as it is the first for which BAT has triggered twice. The separation between the triggers is about ten minutes. The first emission spectrum presents a thermal component, and the temperature decays following a broken power-law. We relate this emission to what we call a proto-black hole in the fireshell model. There is no redshift for this source, so we inferred it by empirical methods. We calculate the radius of the emitting region from the black body flux and the redshift. The second emission has all the characteristics of a canonical GRB. We found the PGRB and simulated the light curve and the spectrum with a numerical code. This, together with GRB 101023 and GRB 090618, is a member of the family of proto-black hole sources.

Session	GRB3	Accepted		Order	Time
Talk	Oral abstract	Title	GRB 111228 and Supernova detection: a binary system?
Co-authors
Abstract	We present the results of GRB 111228 and its associated Supernova. The photometric redshift of this source is 0.713, calculated from the host galaxy of the Supernova. We carry on a spectral analysis and interpret the results within the fireshell model. The light curve can be divided in three parts, the first two presenting a thermal plus a power-law spectrum. The third spike is best fit with a non-thermal model. We interpret the progenitor of this phenomenon as a binary system composed by a massive star and a neutron star. The massive star evolves as a Supernova and gives rise to a neutron star. The other neutron star accretes the ejecta of the SN until it reaches the critical mass and collapses, giving birth to a GRB and a black hole.

Session	GRB2	Accepted		Order	Time
Talk	Oral abstract	Title	GRB 110709B, a new member of the proto-black hole family
Co-authors
Abstract	GRB 110709B is a very peculiar source, as it is the first for which BAT has triggered twice. The separation between the triggers is about ten minutes. The first emission spectrum presents a thermal component, and the temperature decays following a broken power-law. We relate this emission to what we call a proto-black hole in the fireshell model. There is no redshift for this source, so we inferred it by empirical methods. We calculate the radius of the emitting region from the black body flux and the redshift. The second emission has all the characteristics of a canonical GRB. We found the PGRB and simulated the light curve and the spectrum with a numerical code. This, together with GRB 101023 and GRB 090618, is a member of the family of proto-black hole sources.

Session	SN1	Accepted		Order	Time
Talk	Oral abstract	Title	The onset of the supernova in GRB 101023 and GRB 111228
Co-authors
Abstract	We present the results of GRB 111228 and its associated Supernova. The photometric redshift of this source is 0.713, calculated from the host galaxy of the Supernova. We carry on a spectral analysis and interpret the results within the fireshell model. The light curve can be divided in three parts. The first and the second parts have a thermal spectrum. The third spike is best fit with a non-thermal model. We also present the results of GRB 101023, which shares similar properties with GRB 111228. We interpret the progenitor of these phenomena as a binary system composed by a massive star and a neutron star (NS). The massive star explodes as a Supernova (SN) ejecting material that is accreted by the NS companion. The NS reaches in a few seconds the critical mass and gravitationally collapses to a black hole, emitting the GRB.