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14 papers
Comparing the size evolution of GRB 221009A with afterglow models
S. Giarratana, O. S. Salafia, B. Marcote +10
We present very long baseline interferometry (VLBI) observations of GRB221009A obtained with the global-VLBI network at 5 GHz between 231 and 750 days after the burst. The quality…
Gamma-ray burst progenitors revisited
Andrew J. Levan, Jillian C. Rastinejad, Helena-Margaret S. Grabham +11
Recently, several long-duration gamma-ray bursts (GRBs) associated with kilonovae have cast doubt on the traditional, dichotomous mapping between gamma-ray duration and progenitor…
Colour evolution in the radio afterglow of GRB 241025A
S. Giarratana, O. S. Salafia, L. Nava +10
We present the observing campaign of the afterglow of GRB241025A, a gamma-ray burst (GRB) whose prompt emission has been simultaneously detected by Swift, Einstein Probe, Fermi/GBM…
Gamma-ray Bursts in the Radio Sky: the Role of the SKA-VLBI
Stefano Giarratana, Om Sharan Salafia, Xue-Feng Wu +6
Radio observations of -ray bursts (GRBs) employing the very long baseline interferometry (VLBI) technique provide us with fundamental information on the dynamics and the geometr…
A self-consistent explanation of the MeV line in GRB 221009A unveils a dense circum-stellar medium
O. S. Salafia, A. Celotti, E. Sobacchi +6
GRB~221009A has been the brightest gamma-ray burst (GRB) observed to date, and its afterglow has been characterized with unprecedented detail at TeV energies by LHAASO. Quite puzzl…
The short gamma-ray burst population in a quasi-universal jet scenario
O. S. Salafia, M. E. Ravasio, G. Ghirlanda +1
We describe a model of the short gamma-ray burst (SGRB) population under a `quasi-universal jet' scenario in which jets can differ in their on-axis peak prompt emission luminosity…
The brightest GRB ever detected: GRB 221009A as a highly luminous event at z = 0.151
D. B. Malesani, A. J. Levan, L. Izzo +39
Context: The extreme luminosity of gamma-ray bursts (GRBs) makes them powerful beacons for studies of the distant Universe. The most luminous bursts are typically detected at moder…
Constraints on the merging binary neutron star mass distribution and equation of state based on the incidence of jets in the population
O. S. Salafia, A. Colombo, F. Gabrielli +1
A relativistic jet has been produced in the single well-localised binary neutron star (BNS) merger detected to date in gravitational waves (GWs), and the local rates of BNS mergers…
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…
Short GRBs at the dawn of the gravitational wave era
G. Ghirlanda, O. S. Salafia, A. Pescalli +16
We derive the luminosity function and redshift distribution of short Gamma Ray Bursts (SGRBs) using (i) all the available observer-frame constraints (i.e. peak flux, fluence, peak…
Searching for narrow absorption and emission lines in XMM-Newton spectra of gamma-ray bursts
S. Campana, V. Braito, P. D'Avanzo +7
We present the results of a spectroscopic search for narrow emission and absorption features in the X-ray spectra of long gamma-ray burst (GRB) afterglows. Using XMM-Newton data, b…
The rate and luminosity function of long Gamma Ray Bursts
A. Pescalli, G. Ghirlanda, R. Salvaterra +7
We derive, adopting a direct method, the luminosity function and the formation rate of long Gamma Ray Bursts through a complete, flux-limited, sample of Swift bursts which has a hi…
Structure of Gamma-Ray Burst jets: intrinsic versus apparent properties
O. S. Salafia, G. Ghisellini, A. Pescalli +2
With this paper we introduce the concept of apparent structure of a GRB jet, as opposed to its intrinsic structure. The latter is customarily defined specifying the functions epsil…
Luminosity function and jet structure of Gamma Ray Bursts
A. Pescalli, G. Ghirlanda, O. S. Salafia +3
The structure of Gamma Ray Burst (GRB) jets impacts on their prompt and afterglow emission properties. The jet of GRBs could be uniform, with constant energy per unit solid angle w…