Gamma-ray bursts and GRB080319B

Gamma-Ray Bursts (GRB) are short impulses of gamma radiation (time duration ranges from 0.1 to 100 s) distributed almost isotropically across the sky. Most probably they arise during explosions or collisions of stars at cosmological distances. In this paper we discuss their origin, properties and current models. The methods of their observations will be also described. At the end short summary of "Pi of the Sky" GRBs observations will be presented, mainly focused on the naked-eye burst GRB080319B.