Talk detail

Participant	Pisani, Giovanni Battista
Institution	"La Sapienza" di Roma - Piazzale Aldo Moro, 5 - Rome - Lazio - Italy

Session	GRB3	Accepted	Yes	Order	7	Time	17:05 - 17:15
Talk	Oral abstract	Title	A new possible interpretation for GRB 060614
Co-authors	C. L. Bianco, L. Izzo, M. Muccino, A. V. Penacchioni, J. A. Rueda and R. Ruffini
Abstract	The puzzling properties of the long duration GRB 060614 are a challenge for the traditional short/long classification and for current progenitor models. In particular GRB 060614 displays a short-hard emission episode followed by an extended soft emission, it was observed in the offset of a relatively low star formation rate galaxy (z = 0.125) and there is no association with any bright supernova. All these observational features have found a natural explanation classifying GRB 060614 as a "disguised" short GRB within the fireshell scenario. In light of recent progresses in GRB classification within the fireshell model, we here explore an alternative possibility. By revisiting the data analysis of this source, we test if its progenitor may be a White Dwarf (WD) - Neutron Star (NS) binary system with total mass below the critical mass needed for an eventual collapse to a Black Hole (BH). In this case, the prompt and the X-ray steep decay emissions of GRB 060614 would come from the merging of the binary system that gives birth to a massive NS. The subsequent cooling of this neo-NS would produce the prolonged emission observed in X-rays. These results are compared and contrasted with the ones of short and long GRBs.

Session	SN1	Accepted	Yes	Order	4	Time		20'
Talk	Oral abstract	Title	Different cooling processes and connection with GRBs
Co-authors	C. L. Bianco, L. Izzo, M. Muccino, A. V. Penacchioni, J. A. Rueda and R. Ruffini
Abstract	The puzzling properties of the long duration GRB 060614 are a challenge for the traditional short/long classification and for current progenitor models. In particular GRB 060614 displays a short-hard emission episode followed by an extended soft emission, it was observed in the offset of a relatively low star formation rate galaxy (z = 0.125) and there is no association with any bright supernova. All these observational features have found a natural explanation classifying GRB 060614 as a "disguised" short GRB within the fireshell scenario. In light of recent progresses in GRB classification within the fireshell model, we here explore an alternative possibility. By revisiting the data analysis of this source, we test if its progenitor may be a White Dwarf (WD) - Neutron Star (NS) binary system with total mass below the critical mass needed for an eventual collapse to a Black Hole (BH). In this case, the prompt and the X-ray steep decay emissions of GRB 060614 would come from the merging of the binary system that gives birth to a massive NS. The subsequent cooling of this neo-NS would produce the prolonged emission observed in X-rays. These results are compared and contrasted with the ones of short and long GRBs.