GRB2 - The Afterglow and Long GRBs |
Speaker_ |
Bianco, Carlo Luciano |
Co-autors |
M.G. Bernardini, L. Caito, P. Chardonnet, F. Fraschetti, R. Ruffini, S.-S. Xue |
Talk _ |
Theoretical interpretation of "long" and "short" GRBs |
Abstract _ |
The recent Swift and HETE-II observations of the afterglow of short GRBs set a new step toward understanding the uniqueness of our theoretically predicted Gamma-Ray Burst (GRB) structure as composed by a proper-GRB (P-GRB), emitted at the transparency of an electron-positron plasma with suitable baryon loading, and an afterglow comprising the so called "prompt emission" as due to external shocks. The short GRBs are identified with the P-GRBs possibly followed by a small afterglow, while the long GRBs are identified with the afterglows with possibly a small precursor (the P-GRB). The role of the plasma baryon loading parameter in fixing the ratio between the P-GRB and the afterglow intensities, and therefore in discriminating between "short" and "long" GRBs, is discussed in the framework of our theoretical model. |