ANALYSIS OF GRB 080319B AND GRB 050904 WITHIN THE FIRESHELL MODEL: EVIDENCE FOR A BROADER SPECTRAL ENERGY DISTRIBUTION

作者：Patricelli B^*; Bernardini M G; Bianco C L; Caito L; de Barros G; Izzo L; Ruffini R; Vereshchagin G V

来源：Astrophysical Journal, 2012, 756(1): 16.

DOI：10.1088/0004-637X/756/1/16

• black hole physics
• gamma-ray burst: general
• gamma-ray burst: individual (GRB 080319B, GRB 050904)
• ISM: structure

The observation of GRB 080319B, with an isotropic energy E-iso = 1.32 x 10(54) erg, and GRB 050904, with E-iso = 1.04 x 10(54) erg, offers the possibility of studying the spectral properties of the prompt radiation of two of the most energetic gamma-ray bursts (GRBs). This allows us to probe the validity of the fireshell model for GRBs beyond 10(54) erg, well outside the energy range where it has been successfully tested up to now (10(49)-10(53) erg). We find that in the low-energy region, the prompt emission spectra observed by Swift Burst Alert Telescope (BAT) reveals more power than theoretically predicted. The opportunities offered by these observations to improve the fireshell model are outlined in this paper. One of the distinguishing features of the fireshell model is that it relates the observed GRB spectra to the spectrum in the comoving frame of the fireshell. Originally, a fully radiative condition and a comoving thermal spectrum were adopted. An additional power law in the comoving thermal spectrum is required due to the discrepancy of the theoretical and observed light curves and spectra in the fireshell model for GRBs 080319B and 050904. A new phenomenological parameter alpha is correspondingly introduced in the model. We perform numerical simulations of the prompt emission in the Swift BAT bandpass by assuming different values of a within the fireshell model. We compare them with the GRB 080319B and GRB 050904 observed time-resolved spectra, as well as with their time-integrated spectra and light curves. Although GRB 080319B and GRB 050904 are at very different redshifts (z = 0.937 and z = 6.29, respectively), a value of alpha = -1.8 for both of them leads to a good agreement between the numerical simulations and the observed BAT light curves, time-resolved and time-integrated spectra. Such a modified spectrum is also consistent with the observations of previously analyzed less energetic GRBs and reasons for this additional agreement are given. Perspectives for future low-energy missions are outlined.

• 出版日期2012-9-1