A5021887072- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Particle Detector Development and Performance
- Astrophysical Phenomena and Observations
- Pulsars and Gravitational Waves Research
- Astronomical Observations and Instrumentation
- Astro and Planetary Science
- Nuclear Physics and Applications
- SAS software applications and methods
- Astronomy and Astrophysical Research
- Radiation Detection and Scintillator Technologies
- Dark Matter and Cosmic Phenomena
- Particle Accelerators and Free-Electron Lasers
- Geophysics and Gravity Measurements
- Solar and Space Plasma Dynamics
- Stellar, planetary, and galactic studies
- CCD and CMOS Imaging Sensors
- Neutrino Physics Research
- Radio Astronomy Observations and Technology
- Calibration and Measurement Techniques
- Atomic and Subatomic Physics Research
- Particle physics theoretical and experimental studies
- Planetary Science and Exploration
- Medical Imaging Techniques and Applications
- Spacecraft Design and Technology
National Institute for Astrophysics
2015-2024
Institute for Space Astrophysics and Planetology
2012-2024
Istituto Nazionale di Fisica Nucleare, Sezione di Roma I
2010-2024
Istituto Nazionale di Fisica Nucleare, Roma Tor Vergata
2015-2024
University of Alabama
2023
Politecnico di Milano
2020
University of Cagliari
2020
Istituto Nazionale di Fisica Nucleare
2010-2018
University of Nova Gorica
2018
Campbell Collaboration
2017
We present the main results of a study spectral and energetics properties twelve gamma-ray bursts (GRBs) with redshift estimates. All GRBs in our sample were detected by BeppoSAX broad energy range (2–700 ). From estimates good-quality time–integrated spectra we deduce their cosmological rest frames. are satisfactorily represented Band model, no significant soft X–ray excesses or absorptions. find positive correlation between estimated total (isotropic) energies 1–10 000 (Erad) redshifts z....
The JEM–X monitor provides X-ray spectra and imaging with arcminute angular resolution in the 3 to 35 keV band. good low energy response of plays an important role identification gamma ray sources analysis scientific interpretation combined data. is a coded aperture instrument consisting two identical, coaligned telescopes. Each detectors has sensitive area 500 cm2, views sky through its own mask. masks are inverted respect each other 3' across effective field view about 10° diameter.
<i>Context. <i/> AGILE is an Italian Space Agency mission dedicated to observing the gamma-ray Universe. The AGILE's very innovative instrumentation for first time combines a imager (sensitive in energy range 30 MeV–50 GeV), hard X-ray 18–60 keV), calorimeter 350 keV–100 MeV), and anticoincidence system. was successfully launched on 2007 April 23 from Indian base of Sriharikota inserted equatorial orbit with low particle background.<i>Aims. <i/>AGILE provides crucial data study active...
One of the primary science goals next generation hard X-ray timing instruments is to determine equation state matter at supranuclear densities inside neutron stars, by measuring radius stars with different masses accuracies a few percent. Three main techniques can be used achieve this goal. The first involves waveform modelling. flux we observe from hotspot on star surface offset rotational pole will modulated star's rotation, giving rise pulsation. Information about mass and encoded into...
The well known Crab Nebula is at the center of SN1054 supernova remnant. It consists a rotationally-powered pulsar interacting with surrounding nebula through relativistic particle wind. emissions originating from and have been considered to be essentially stable. Here we report detection strong gamma-ray (100 MeV-10 GeV) flares observed by AGILE satellite in September, 2010 October, 2007. In both cases, unpulsed flux increased factor 3 compared non-flaring flux. flare luminosity short...
BeppoSAX/PDS experiment is one of four narrow field instruments the BeppoSAX payload, that also includes two wide cameras. The goal PDS to extend energy range hard X–rays. operative 15 300 keV, where can perform sensitive spectral and temporal studies celestial sources. detector composed 4 actively shielded NaI(Tl)/CsI(Na) phoswich scintillators with a total geometric area view 13 (FWHM). In this paper we describe design discuss its functional performance calibration data analysis system.
We report on the discovery of two emission features observed in x-ray spectrum afterglow gamma-ray burst (GRB) 16 December 1999 by Chandra X-ray Observatory. These are identified with Ly(alpha) line and narrow recombination continuum hydrogenic ions iron at a redshift z = 1.00 +/- 0.02, providing an unambiguous measurement distance GRB. Line width intensity imply that progenitor GRB was massive star system ejected, before event, quantity approximately 0.01 mass sun velocity 0.1 speed light,...
We report the detection by Astrorivelatore Gamma a Immagini Leggero (AGILE) satellite of terrestrial gamma ray flashes (TGFs) obtained with minicalorimeter (MCAL) detector operating in energy range 0.3–100 MeV. select events typically lasting few milliseconds spectral and directional selections consistent TGF characteristics previously reported other space missions. During period 1 June 2008 to 31 March 2009 we detect 34 high‐confidence showing millisecond durations geographical distribution...
We present the AGILE gamma-ray observations in energy range 50 MeV - 10 GeV of supernova remnant (SNR) W44, one most interesting systems for studying cosmic-ray production. W44 is an intermediate-age SNR (20, 000 years) and its ejecta expand a dense medium as shown by prominent radio shell, nearby molecular clouds, bright [SII] emitting regions. extend our analysis to energies substantially lower than previous measurements which could not conclusively establish nature radiation. find that...
Strong electric discharges associated with thunderstorms can produce terrestrial gamma-ray flashes (TGFs), i.e., intense bursts of x rays and $\ensuremath{\gamma}$ lasting a few milliseconds or less. We present in this Letter new TGF timing spectral data based on the observations Italian Space Agency AGILE satellite. determine that emission above 10 MeV has significant power-law component reaching energies up to 100 MeV. These results challenge theoretical models runaway electron...
eXTP is a science mission designed to study the state of matter under extreme conditions density, gravity and magnetism. Primary goals are determination equation at supra-nuclear measurement QED effects in highly magnetized star, accretion strong-field regime gravity. targets include isolated binary neutron stars, strong magnetic field systems like magnetars, stellar-mass supermassive black holes. The carries unique unprecedented suite state-of-the-art scientific instruments enabling for...