628 citations · 8.3k across the 153 of their papers we have counts for
10 papers · 1 filter
The birth place of gamma-ray bursts: abundance gradients and constraints on progenitors
Enrico Ramirez-Ruiz, Davide Lazzati, Andrew W. Blain
The physics of gamma-ray bursts (GRBs) and their offsets from the centers of their host galaxies are used to investigate the evolutionary state of their progenitors, motivated by t…
Precursors and electron-positron pair loading from erupting fireballs
Enrico Ramirez-Ruiz, Andrew I. MacFadyen, Davide Lazzati
Recent observations suggest that long-duration gamma-ray bursts and their afterglows are produced by highly relativistic jets emitted in core-collapse explosions. As the jet makes…
Determining the location of Gamma-Ray Bursts through the evolution of their soft X-ray absorption
Davide Lazzati, Rosalba Perna
We investigate through dedicated numerical simulations the evolution of the soft X-ray absorption properties of a cloud surrounding a gamma-ray burst source. We show that the absor…
Possible detection of hard X-ray afterglows of short gamma-ray bursts
Davide Lazzati, Enrico Ramirez-Ruiz, Gabriele Ghisellini
We report the discovery of a transient and fading hard X-ray emission in the BATSE lightcurves of a sample of short gamma-ray bursts. We have summed each of the four channel BATSE…
Time dependent photoionization opacities in dense Gamma-Ray Burst environments
Davide Lazzati, Rosalba Perna, Gabriele Ghisellini
The recent detection of a transient absorption feature in the X-ray prompt emission of GRB 990705 showed the importance of such observations in the understanding of gamma-ray burst…
On the absorption feature in the prompt X-ray spectrum of GRB 990705
D. Lazzati, G. Ghisellini, L. Amati +3
The absorption feature detected in the prompt X-ray emission of GRB 990705 bears important consequences. We investigate different production mechanisms and we conclude that the abs…