Induced Gravitational Collapse in the BATSE era: the case of GRB 970828

Дата и время публикации : 2013-11-28T21:55:42Z

Авторы публикации и институты :
R. Ruffini
L. Izzo
M. Muccino
Jorge A. Rueda
C. Barbarino
C. L. Bianco
H. Dereli
M. Enderli
A. V. Penacchioni
G. B. Pisani
Y. Wang

Ссылка на журнал-издание: Ссылка на журнал-издание не найдена
Коментарии к cтатье: 11 pages, 15 figures, submitted to A&A. arXiv admin note: text overlap with arXiv:1205.6651
Первичная категория: astro-ph.HE

Все категории : astro-ph.HE, astro-ph.CO

Краткий обзор статьи: Following the recently established "Induced Gravitational Collapse" (IGC) paradigm, we here interpret GRB 970828 in terms of the four episodes typical of such a paradigm. The "Episode 1", up to 40 s after the trigger time t_0, with a time varying thermal emission and a total energy of E_{iso,1st} = 2.60×10^{53} erg, is interpreted as due to the onset of a supernova Ib/c in a tight binary system with a companion neutron star. The "Episode 2", observed up t_0+90 s, is interpreted as a canonical gamma ray burst, with an energy of E^{e^+e^-}_{tot} = 1.60×10^{53} erg, a baryon load of B = 7×10^{-3} and a bulk Lorentz factor at transparency of Gamma = 142.5. From this Episode 2, we infer that the GRB exploded in an environment with a large average particle density <n> ~ 10^3 particles/cm^3 and dense clouds characterized by typical dimensions of (4 – 8)x10^{14} cm and delta n / n ~ 10. The "Episode 3" is identified from t_0+90 s all the way up to 10^{5-6} s: despite the paucity of the early X-ray data, typical in the BATSE, pre-Swift era, we find extremely significant data points in the late X-ray afterglow emission of GRB 970828, which corresponds to the ones observed in all IGC GRBs-SNe sources. The "Episode 4", related to the Supernova emission, does not appear to be observable in this source, due to the presence of darkening from the large density of the GRB environment, also inferred from the analysis of the Episode 2.

Category: Physics