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16 papers · 2 filters
Bulk Lorentz factors of Gamma-Ray Bursts
G. Ghirlanda, F. Nappo, G. Ghisellini +6
Knowledge of the bulk Lorentz factor of GRBs allows us to compute their comoving frame properties shedding light on their physics. Upon collisions with the circumburst matt…
Consistency with synchrotron emission in the bright GRB 160625B observed by Fermi
M. E. Ravasio, G. Oganesyan, G. Ghirlanda +4
We present time resolved spectral analysis of prompt emission from GRB 160625B, one of the brightest bursts ever detected by Fermi in its nine years of operations. Standard empiric…
NuSTAR view of the black hole wind in the galaxy merger IRAS F111193257
F. Tombesi, S. Veilleux, M. Melendez +5
Galactic winds driven by active galactic nuclei (AGN) have been invoked to play a fundamental role in the co-evolution between supermassive black holes and their host galaxies. Fin…
Spectroscopic identification of r-process nucleosynthesis in a double neutron star merger
E. Pian, P. D'Avanzo, S. Benetti +81
The merger of two neutron stars is predicted to give rise to three major detectable phenomena: a short burst of gamma-rays, a gravitational wave signal, and a transient optical/nea…
Characterization of Gamma-Ray Burst prompt emission spectra down to soft X-rays
Gor Oganesyan, Lara Nava, Giancarlo Ghirlanda +1
Detection of prompt emission by Swift-XRT provides a unique tool to study how the prompt spectrum of gamma-ray bursts (GRBs) extends down to the soft X-ray band. This energy band i…
Detection of Low-energy Breaks in Gamma-Ray Burst Prompt Emission Spectra
Gor Oganesyan, Lara Nava, Giancarlo Ghirlanda +1
The radiative process responsible for gamma-Ray Burst (GRB) prompt emission has not been identified yet. If dominated by fast-cooling synchrotron radiation, the part of the spectru…