E. Moretti
A5075368795- Astrophysics and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- Particle Detector Development and Performance
- Astrophysical Phenomena and Observations
- Dark Matter and Cosmic Phenomena
- Radio Astronomy Observations and Technology
- Pulsars and Gravitational Waves Research
- Neutrino Physics Research
- Radiation Detection and Scintillator Technologies
- Particle Accelerators and Free-Electron Lasers
- Astronomical Observations and Instrumentation
- Nuclear Physics and Applications
- Medical Imaging Techniques and Applications
- Astronomy and Astrophysical Research
- Astro and Planetary Science
- SAS software applications and methods
- Radiation Therapy and Dosimetry
- Consumer Market Behavior and Pricing
- Atomic and Subatomic Physics Research
- Solar and Space Plasma Dynamics
- Geophysics and Gravity Measurements
- Particle physics theoretical and experimental studies
- Scheduling and Optimization Algorithms
- Metaheuristic Optimization Algorithms Research
- Vehicle Routing Optimization Methods
Fondazione Bruno Kessler
2023-2024
Institute for High Energy Physics
2018-2023
Istituto Nazionale di Fisica Nucleare, Sezione di Torino
2019-2022
University of Trieste
2009-2021
The University of Tokyo
2021
Brera Astronomical Observatory
2019-2021
Istituto Nazionale di Fisica Nucleare, Sezione di Trieste
2009-2021
RIKEN
2019-2021
National Institute for Astrophysics
2010-2021
University of Zagreb
2019-2021
We present the first joint analysis of gamma-ray data from MAGIC Cherenkov telescopes and Fermi Large Area Telescope (LAT) to search for signals dark matter annihilation in dwarf satellite galaxies. combine 158 hours Segue 1 observations with 6-year 15 galaxies by -LAT. obtain limits on cross-section particle masses between 10 GeV 100 TeV—the widest mass range ever explored a single analysis. These improve previously published -LAT results up factor two at certain masses. Our new inclusive...
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...
Abstract The Large Area Telescope (LAT) aboard the Fermi spacecraft routinely observes high-energy emission from gamma-ray bursts (GRBs). Here we present second catalog of LAT-detected GRBs, covering first 10 yr operations, 2008 to 2018 August 4. A total 186 GRBs are found; these, 91 show in range 30–100 MeV (17 which seen only this band) and 169 detected above 100 MeV. Most these sources were discovered by other instruments ( /GBM, Swift /BAT, AGILE, INTEGRAL ) or reported Interplanetary...
Abstract A neutrino with energy ∼290 TeV, IceCube-170922A, was detected in coincidence the BL Lac object TXS 0506+056 during enhanced gamma-ray activity, chance being rejected at ∼3 σ level. We monitored very-high-energy (VHE) band Major Atmospheric Gamma-ray Imaging Cherenkov (MAGIC) telescopes for ∼41 hr from 1.3 to 40.4 days after detection. Day-timescale variability is clearly resolved. interpret quasi-simultaneous and broadband electromagnetic observations a novel one-zone...
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 report on the observations of 14 dwarf spheroidal galaxies with Fermi Gamma-Ray Space Telescope taken during first 11 months survey mode operations. The telescope provides a new opportunity to test particle dark matter models through expected gamma-ray emission produced by pair annihilation weakly interacting massive particles (WIMPs). Local Group galaxies, largest galactic substructures predicted cold scenario, are attractive targets for such indirect searches because they nearby and...
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...
GRB110721A was observed by the Fermi Gamma-ray Space Telescope using its two instruments Large Area (LAT) and Burst Monitor (GBM). The burst consisted of one major emission episode which lasted for ~24.5 seconds (in GBM) had a peak flux 5.7\pm0.2 x 10^{-5} erg/s/cm^2. time-resolved spectrum is best modeled with combination Band function blackbody spectrum. energy component initially 15\pm2 MeV, highest value ever detected in GRB. This measurement made possible combining GBM/BGO data LAT Low...
We present the detections of 19 solar flares detected in high-energy gamma rays (above 100 MeV) with Fermi Large Area Telescope (LAT) during its first four years operation. Interestingly, all are associated fairly fast Coronal Mass Ejections (CMEs) and not powerful X-ray flares. then describe detailed temporal, spatial spectral characteristics two long-lasting events: 2011 March 7 flare, a moderate (M3.7) impulsive flare followed by slowly varying gamma-ray emission over 13 hours, June M2.5...
The flat-spectrum radio quasar PKS 1441+25 at a redshift of z = 0.940 is detected between 40 and 250 GeV with significance 25.5σ using the MAGIC telescopes. Together gravitationally lensed blazar QSO B0218+357 (z 0.944), most distant very high energy (VHE) to date. observations were triggered by an outburst in 2015 April seen energies Large Area Telescope on board Fermi. Multi-wavelength suggest subdivision state into two distinct flux states. In band covered MAGIC, variability timescale...
It is widely believed that the bulk of Galactic cosmic rays are accelerated in supernova remnants (SNRs). However, no observational evidence presence particles PeV energies SNRs has yet been found. The young historical SNR Cassiopeia A (Cas A) appears as one best candidates to study acceleration processes. Between December 2014 and October 2016 we observed Cas with MAGIC telescopes, accumulating 158 hours good-quality data. We derived spectrum source from 100 GeV 10 TeV. also analysed...
The Supernova Remnant (SNR) IC 443 is an intermediate-age remnant well known for its radio, optical, X-ray and gamma-ray energy emissions. In this Letter we study the emission above 100 MeV from as obtained by AGILE satellite. A distinct pattern of diffuse in range MeV-3 GeV detected across SNR with prominent maximum (source "A") localized Northeastern shell a flux F = (47 \pm 10) 10^{-8} photons cm^{-2} s^{-1} MeV. This location site strongest shock interaction between blast wave dense...
We present the first catalog of high-confidence <i>γ<i/>-ray sources detected by AGILE satellite during observations performed from July 9, 2007 to June 30, 2008. Cataloged were merging all available data over entire time period. AGILE, launched in April 2007, is an ASI mission devoted 30 MeV–50 GeV energy range, with simultaneous X-ray imaging capability 18–60 keV band. This based on Gamma-Ray Imaging Detector (GRID) for energies greater than 100 MeV. For catalog, we adopted a conservative...
The emission from a gamma-ray burst (GRB) photosphere can give rise to variety of spectral shapes. spectrum retain the shape Planck function or it be broadened and have Band function. This fact is best illustrated by studying GRB090902B: main component initially close function, which only explained jet photosphere. Later, same evolves into broader thus provides observational evidence that non-thermal spectrum. We show such broadening most naturally subphotospheric dissipation in jet. mainly...
We present the results of extensive observations by gamma-ray AGILE satellite Galactic region hosting Carina nebula and remarkable colliding wind binary Eta Carinae (η Car) during period 2007 July–2009 January. detect a source (1AGL J1043−5931) consistent with position η Car. If 1AGL J1043−5931 is associated Car system, our data provide long sought first detection above 100 MeV binary. The average flux integrated over preperiastron July–2008 October Fγ = (37 ± 5) × 10−8 ph cm−2 s−1...
We report on the multiwavelength observations of bright, long gamma-ray burst GRB 110731A, by Fermi and Swift observatories, MOA GROND optical telescopes. The analysis prompt phase reveals that 110731A shares many features with bright Large Area Telescope bursts observed during first three years on-orbit: a light curve short time variability across whole energy range phase, delayed onset emission above 100 MeV, extra power-law component temporally extended high-energy emission. In addition,...
Context. QSO B0218+357 is a gravitationally lensed blazar located at redshift of 0.944. The gravitational lensing splits the emitted radiation into two components that are spatially indistinguishable by gamma-ray instruments, but separated 10–12 day delay. In July 2014, experienced violent flare observed Fermi-LAT and followed MAGIC telescopes.
Aims. We aim to characterize the multiwavelength emission from Markarian 501 (Mrk 501), quantify energy-dependent variability, study potential multiband correlations, and describe temporal evolution of broadband within leptonic theoretical scenarios. Methods. organized a campaign take place between March July 2012. Excellent coverage was obtained with more than 25 instruments, including MAGIC, FACT VERITAS Cherenkov telescopes, instruments on board Swift Fermi spacecraft, telescopes operated...
Abstract We report on the observations of gamma-ray burst (GRB) 190114C by Fermi Gamma-ray Space Telescope and Neil Gehrels Swift Observatory . The prompt emission was detected GRB Monitor (GBM), Large Area (LAT), Burst Alert (BAT) long-lived afterglow subsequently observed GBM, LAT, X-ray (XRT), UV Optical Telescope. early-time reveal multiple components that evolve independently, with a delayed power-law component exhibits significant spectral attenuation above 40 MeV in first few seconds...
Abstract The Vehicle routing problem with time windows is frequently found in literature, while multiple are not often considered. In this paper a mathematical formulation of the vehicle presented, taking into account periodic constraints. An algorithm based on Ant Colony System proposed and implemented. Computational results related to purpose-built benchmark finally reported.
The Large Area Telescope on board the \textit{Fermi} satellite (\textit{Fermi}-LAT) detected more than 1.6 million cosmic-ray electrons/positrons with energies above 60 GeV during its first year of operation. arrival directions these events were searched for anisotropies angular scale extending from $\sim$ 10 $^\circ$ up to 90$^\circ$, and minimum energy 480 GeV. Two independent techniques used search anisotropies, both resulting in null results. Upper limits degree anisotropy set that...
Supernova remnants (SNRs) are believed to be the main sources of Galactic cosmic rays. Molecular clouds associated with SNRs can produce gamma-ray emission through interaction accelerated particles concentrated gas. The middle aged SNR W28, for its system dense molecular clouds, provides an excellent opportunity test this hypothesis. We present AGILE/GRID observations and compare them at other wavelengths (TeV 12CO J=1-->0 line emission). flux detected by AGILE from dominant source W28 is...
{\it Fermi Gamma-ray Space Telescope} observations of GRB110721A have revealed two emission components from the relativistic jet: photosphere, peaking at $\sim 100$ keV and a non-thermal component, which peaks 1000$ keV. We use photospheric component to calculate properties outflow. find strong evolution in flow properties: Lorentz factor decreases with time during bursts $\Gamma \sim 150$ (assuming redshift $z=2$; values are only weakly dependent on unknown efficiency parameters). Such...