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79 papers · 1 filter
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 ROSAT Deep Cluster Survey: Constraints on Cosmology
S. Borgani, P. Rosati, R. Della Ceca +2
We use the ROSAT Deep Cluster Survey (RDCS) to trace the evolution of the cluster abundance out to and constrain cosmological models. We resort to a phenomenological…
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…
The Timing Evolution of 4U 1630-47 During its 1998 Outburst
S. W. Dieters, T. Belloni, E. Kuulkers +8
We report on the evolution of the timing of 4U1630-47 during its 1998 outburst using data obtained with the Rossi X-ray Timing Explorer (RXTE). The count rate and position in hardn…
The ASCA Hard Serendipitous Survey (HSS): a Progress Update
R. Della Ceca, V. Braito, I. Cagnoni +1
We present here a status update on the ASCA Hard Serendipitous Survey (HSS), a survey program conducted in the 2-10 keV energy band. In particular we discuss the number-flux relati…
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…