Carlo Luciano Bianco

Luminosity Function Statistics Applied in GRB Samples

The luminosity function (LF) statistics applied in data of GRBs detected by GBM/Fermi and BAT/Swift is the theme approached in this work. The LF is a strong statistical tool to extract useful information from astrophysical samples, and the key point of this statistical analysis is in the detector sensitivity, where we have performed careful analysis. We produced, by LF statistics, the GRB predicted distributions of: peak ux N(Fpk), redshift N(z) and peak luminosity N(Lpk). We also used different GRB rates. We performed a comparison between the distributions predicted and observed (with and without redshifts), where we had to build a list with more then 250 GRBs with known redshifts. We estimated the effects of the Malmquist bias in all samples, and we looked for a correlation between the isotropic luminosity and the Band peak spectral energy.

Black holes, neutron stars and supernovae within the induced gravitational collapse paradigm for GRBs

Recent progress in understanding of the Gamma-Ray Bursts, Supernovae and Black Holes is presented.

GRB 140619B: a short GRB from a neutron star merger leading to the black hole formation

Marco Muccino∗†,ab Remo Ruffini,abcd Milos Kovacevic,ac Luca Izzo,ab Fernanda G. Oliveira,ac Jorge A. Rueda, abd Carlo L. Bianco,ab Maxime Enderli,ac Ana V. Penacchioni,de Giovanni B. Pisani,ab Yu Wangab and Elena Zaninonid . aDip. di Fisica, Sapienza Università di Roma, Piazzale Aldo Moro 5, I-00185 Rome, Italy. bICRANet, Piazza della Repubblica 10, I-65122 Pescara, Italy. cUniversité de Nice Sophia Antipolis, CEDEX 2, Grand Château Parc Valrose, Nice, France. dICRANet-Rio, CBPF, Rua Dr. Xavier Sigaud 150, Rio de Janeiro, RJ, 22290-180, Brazil. eINPE, Av. dos Astronautas, 1758, São José dos Campos, SP, 12227-010, Brazil. E-mail: marco.muccino@icra.it

THERMAL EMISSION IN GRBS: THE CASE OF GRB 090618

The identification of thermal signatures in the spectra of Gamma Ray Bursts (GRBs) has become possible now, thanks especially to the modern space missions dedicated to their observations. There are several models in literature that take into account the presence of a thermal emission, in particular in the early emission of a GRB. In this work we discuss the case of GRB 090618, where thermal signatures in the early γ and X-rays have been observed.

GRBs and the thermalization process of electron-positron plasmas

We discuss the temporal evolution of the pair plasma created in Gamma‐Ray Burst sources. A particular attention is paid to the relaxation of the plasma into thermal equilibrium. We also discuss the connection between the dynamics of expansion and the spatial geometry of the plasma. The role of the baryonic loading parameter is emphasized.