Gamma Ray Burst
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Recent papers in Gamma Ray Burst
... 5. Tavani M., Barbiellini G., Caraveo P., Di Pippo S., Longo F., Mereghetti S., Morselli A., Pellizzoni A., Picozza P., Severoni S., Tavecchio F., Vercellone S., 1998, AGILE Phase A Report 6. Tavani M., et al., 2000, Proceedings of... more
GRB afterglows are well suited to extinction studies due to their brightness, simple power-law spectra and the occurrence of GRBs in distant star forming galaxies. In this paper we present results from the SED analysis of a sample of 41... more
An apparatus to search for optical flashes in the sky is described. It has beenoptimized for gamma ray bursts (GRB) optical counterparts. It consists of 2×16 cameras covering all the sky. The sky is monitored continuously and the data... more
We present the discovery and follow-up observations of the afterglow of the GRB 011121 and its associated supernova SN 2001ke. Images were obtained with the OGLE 1.3m telescope in BVRI passbands, starting 10.3 hours after the burst. The... more
We invoke the global properties of the actual GTR field equations for spherical collapse to directly show that the condition for formation of trapped surfaces, 2GM/R >1 is not allowed by GTR. And therefore all singularity theorems... more
In gamma-ray burst research it is quite common to fit the afterglow light curves with a broken power law to interpret the data. We apply this method to a computer simulated population of afterglows and find systematic differences between... more
In this phd dissertation thesis I present results from simulations of streaming plasmas in relativistic collisionless shocks, which are believed to produce Gamma-Ray Burst afterglows. Further, results from simulations of detailed... more
BIRCAM is a near-infrared (0.8-2.5um) cryogenic camera based on a 1Kx1K HgCdTe array. It was designed for - and is now mounted at - one of the Nasmyth foci of the fast-slewing 0.6 m BOOTES-IR telescope at the Sierra Nevada Observatory... more
Gamma-ray bursts, which are among the most violent events in the universe, are one of the few viable candidates to produce ultrahigh energy cosmic rays. Recently, observations have revealed that GRBs generally originate from metal-poor... more
Stochastic acceleration of charged particles due to interactions with magnetohydrodynamic (MHD) plasma waves is the dominant process leading to the formation of the high-energy electron and ion distributions in a variety of astrophysical... more
Observations of the extraordinarily bright optical afterglow (OA) of GRB 991208 started 2.1 d after the event. The flux decay constant of the OA in the R-band is -2.30 +/- 0.07 up to 5 d, which is very likely due to the jet effect, and... more
The origin of celestial gamma ray bursts remains one of the great mysteries of modern astrophysics. The GAMCIT Get-Away-Special payload is designed to provide new and unique data in the search for the sources of gamma ray bursts. GAMCIT... more
Temporal profiles of subpeaks detected in GRBs, belonging to a sample of 65 short duration bursts selected from the 3B catalog, have been studied by fitting the former with lognormal functions since most subpeaks exhibit fast rise and... more
Context: Gamma-ray bursts are cosmological sources emitting radiation from the gamma-rays to the radio band. Substantial observational efforts have been devoted to the study of gamma-ray bursts during the prompt phase, i.e. the initial... more
The Mini-Calorimeter (MCAL) instrument on-board the AGILE satellite is a non-imaging gamma-ray scintillation detector sensitive in the 300keV-100MeV energy range with a total on-axis geometrical area of 1400cm^2. Gamma-Ray Bursts (GRBs)... more
Abstract: The luminosity and the spectral distribution of the afterglow of GRB 031203 have been presented within our theoretical framework, which envisages the GRB structure as composed by a proper-GRB, emitted at the transparency of an... more