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Constraints on the emission mechanisms of gamma-ray bursts
Gabriele Ghisellini, Annalisa Celotti, Davide Lazzati
If the emission of gamma-ray bursts were due to the synchrotron process in the standard internal shock scenario, then the typical observed spectrum should have a slope F(nu) \propt…
The detection of linear polarization in the afterglow of GRB 990510 and its theoretical implications
Davide Lazzati, Stefano Covino, Gabriele Ghisellini
We present the recent discovery of linear polarization of the optical afterglow of GRB 990510. Effects that could introduce spurious polarization are discussed, showing that they d…
Compton Dragged Gamma--Ray Bursts associated with Supernovae
Davide Lazzati, Gabriele Ghisellini, Annalisa Celotti +1
It is proposed that the gamma-ray photons that characterize the prompt emission of Gamma-Ray Bursts are produced through the Compton drag process, caused by the interaction of a re…
Constraints on the bulk Lorentz factor in the internal shock scenario for gamma-ray bursts
Davide Lazzati, Gabriele Ghisellini
We investigate, independently of specific emission models, the constraints on the value of the bulk Lorentz factor Gamma of a fireball. We assume that the burst emission comes from…
Polarization lightcurves and position angle variation of beamed gamma-ray bursts
Gabriele Ghisellini, Davide Lazzati
The recently detected linear polarization in the optical lightcurve of GRB 990510 renewed the interest on how polarization can be produced in gamma-ray burst fireballs. Here we pre…
GRB Redshift determination in the X-ray band
Sergio Campana, Gabriele Ghisellini, Davide Lazzati +3
If gamma-ray bursts originate in dense stellar forming regions, the interstellar material can imprint detectable absorption features on the observed X-ray spectrum. Such features c…