Intrinsic Properties of Swift Long Gamma-Ray Bursts

College of Science, Guilin University of Technology, Guilin 541004, China

Abstract

We performed a statistical analysis of the intrinsic properties of long gamma-ray bursts (GRBs) observed by Swift. The intrinsic quantities are the rest-frame duration T_90,rest, the rest-frame peak energy E_p,rest, the isotropic equivalent energy E_iso and the peak luminosity L_iso of the prompt emission. We find that the distributions of T_90,rest, E_p,rest, E_iso and L_iso all span a wide range and the central values of these intrinsic quantities of long GRBs are T_90,rests10s, E_p,rests520keV, E_isos10⁵³ erg and L_isos4 × 10⁵² erg/s. We also find both E_p,rest and L_iso are independent with T₉₀, but E_iso is correlated with T₉₀.