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The Resolved Fraction of the Cosmic X-Ray Background
- A. Moretti, S. Campana, D. Lazzati, G. Tagliaferri
- Physics
- 28 January 2003
We present the X-ray source number counts in two energy bands (0.5-2 and 2-10 keV) from a very large source sample: we combine data of six different surveys, both shallow wide-field and deep…
The Collimation-corrected Gamma-Ray Burst Energies Correlate with the Peak Energy of Their νFν Spectrum
- G. Ghirlanda, G. Ghisellini, D. Lazzati
- Physics
- 29 May 2004
We consider all bursts with known redshift and νFν peak energy, E. For a good fraction of them an estimate of the jet opening angle is available from the achromatic break of their afterglow light…
Evidence for supernova signatures in the spectrum of the late-time bump of the optical afterglow of GRB 021211
- M. D. Valle, D. Malesani, L. Stella
- Physics
- 16 June 2003
We present photometric and spectroscopic observations of the gamma-ray burst GRB 021211 obtained during the late stages of its afterglow. The light curve shows a rebrightening occurring ∼25 days…
Gamma-Ray Bursts: New Rulers to Measure the Universe
- G. Ghirlanda, G. Ghisellini, D. Lazzati, C. Firmani
- Physics
- 18 August 2004
The best measure of the universe should be done using a standard "ruler" at any redshift. Type Ia supernovae (SN Ia) probe the universe up to z ~ 1.5, while the cosmic microwave background (CMB)…
Afterglow light curves, viewing angle and the jet structure of γ-ray bursts
- E. Rossi, D. Lazzati, M. Rees
- Physics
- 4 December 2001
Gamma-ray bursts are often modelled as jet-like outflows directed towards the observer; the cone angle of the jet is then commonly inferred from the time at which there is a steepening in the…
The Rates of Hypernovae and Gamma-Ray Bursts: Implications for Their Progenitors
- P. Podsiadlowski, P. Mazzali, K. Nomoto, D. Lazzati, E. Cappellaro
- Physics
- 17 March 2004
A critical comparison of estimates for the rates of hypernovae (HNe) and gamma-ray bursts (GRBs) is presented. Within the substantial uncertainties, the estimates are shown to be quite comparable and…
Off-axis emission of short γ-ray bursts and the detectability of electromagnetic counterparts of gravitational-wave-detected binary mergers
- D. Lazzati, A. Deich, B. Morsony, Jared C. Workman
- Physics
- 4 October 2016
We present calculations of the wide angle emission of short-duration gamma-ray bursts from compact binary merger progenitors. Such events are expected to be localized by their gravitational wave…
Off-axis Prompt X-Ray Transients from the Cocoon of Short Gamma-Ray Bursts
- D. Lazzati, D. López-Cámara, M. Cantiello, B. Morsony, R. Perna, Jared C. Workman
- Physics
- 5 September 2017
We present the results of numerical simulations of the prompt emission of short-duration gamma-ray bursts. We consider emission from the relativistic jet, the mildly relativistic cocoon, and the…
Internal shocks in the jets of radio-loud quasars
- M. Spada, G. Ghisellini, D. Lazzati, A. Celotti
- Physics
- 26 March 2001
The central engine causing the production of jets in radio sources may work intermittently, accelerating shells of plasma with different mass, energy and velocity. Faster but later shells can then…
Late Time Afterglow Observations Reveal a Collimated Relativistic Jet in the Ejecta of the Binary Neutron Star Merger GW170817.
- D. Lazzati, R. Perna, Jared C. Workman
- PhysicsPhysical review letters
- 8 December 2017
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