F. Lazzarotto
A5050934887- Gamma-ray bursts and supernovae
- Astrophysics and Cosmic Phenomena
- Particle Detector Development and Performance
- Astrophysical Phenomena and Observations
- Particle Accelerators and Free-Electron Lasers
- Pulsars and Gravitational Waves Research
- Solar and Space Plasma Dynamics
- Dark Matter and Cosmic Phenomena
- Nuclear Physics and Applications
- Geophysics and Gravity Measurements
- SAS software applications and methods
- Astro and Planetary Science
- Astronomical Observations and Instrumentation
- Radio Astronomy Observations and Technology
- Neutrino Physics Research
- Ionosphere and magnetosphere dynamics
- Astronomy and Astrophysical Research
- Planetary Science and Exploration
- Radiation Detection and Scintillator Technologies
- Particle physics theoretical and experimental studies
- CCD and CMOS Imaging Sensors
- Spacecraft Design and Technology
- Atomic and Subatomic Physics Research
- Distributed and Parallel Computing Systems
- Calibration and Measurement Techniques
Osservatorio Astronomico di Padova
2020-2024
National Institute for Astrophysics
2008-2023
Institute for Space Astrophysics and Planetology
2010-2013
Istituto di Radioastronomia di Bologna
2012
Istituto di Astrofisica Spaziale e Fisica Cosmica di Bologna
2009-2011
Istituto Nazionale di Fisica Nucleare, Sezione di Roma I
2006-2011
FishBase Information and Research Group
2010
Istituto Nazionale di Fisica Nucleare, Sezione di Trieste
2007-2009
Astronomical Observatory of Rome
2009
Istituto di Astrofisica Spaziale e Fisica Cosmica di Milano
2004-2009
<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...
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...
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...
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...
We present optical, X-ray, high energy ($\lessapprox 30$ GeV) and very ($\gtrapprox 100$ GeV; VHE) observations of the high-frequency peaked blazar Mrk 421 taken between 2008 May 24 June 23. A $\gamma$-ray signal was detected by AGILE with \sqrt{TS}=4.5 on 9--15, $F(E>100 \mathrm{MeV})= 42^{+14}_{-12}\times 10^{-8}$ photons cm$^{-2}$ s$^{-1}$. This flaring state is brighter than average flux observed EGRET a factor $\sim$3, but still consistent highest flux. In hard X-rays (20-60 keV)...
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 18 months of multiwavelength observations the blazar 3C 454.3 (Crazy Diamond) carried out in July 2007-January 2009. show results AGILE campaigns which took place May-June 2008, July-August and October 2008-January During May 2009 period, source average flux was highly variable, from an gamma-ray F(E>100MeV) > 200E-8 ph/cm2/s to F(E>100MeV)~80E-8 The spectrum between 100 MeV 1 GeV can be fit by a simple power law (Gamma_GRID ~ 2.0 2.2). Only 3-sigma upper limits derived 20-60...
Since 2005, the blazar 3C 454.3 has shown remarkable flaring activity at all frequencies, and during last four years it exhibited more than one γ-ray flare per year, becoming most active in sky. We present for first time multi-wavelength AGILE, Swift, INTEGRAL, GASP-WEBT data collected order to explain extraordinary of which occurred 2010 November. On November 20 (MJD 55520), reached a peak flux (E >100 MeV) Fpγ = (6.8 ± 1.0) × 10−5 photons cm−2 s−1 on timescale about 12 hr, factor six...
We present the characteristics of 308 terrestrial gamma ray flashes (TGFs) detected by Minicalorimeter (MCAL) instrument on board AGILE satellite during period March 2009–July 2012 in ±2.5° latitude band and selected to have maximum photon energy up 30 MeV. The events are analyzed compared observational framework established two other currently active missions capable detecting TGFs from space, RHESSI Fermi. A detailed model MCAL dead time is presented, which fundamental properly interpret...
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...
We report on the extreme gamma-ray activity from FSRQ PKS 1510-089 observed by AGILE in March 2009. In same period a radio-to-optical monitoring of source was provided GASP-WEBT and REM. Moreover, several Swift ToO observations were triggered, adding important information behaviour optical/UV to hard X-rays. paid particular attention calibration Swift/UVOT data make it suitable blazars spectra. Simultaneous radio gamma rays allowed us study detail correlation among emission variability at...
We report on the extremely intense and fast gamma-ray are above 100 MeV detected by AGILE from Crab Nebula in mid-April 2011. This event is fourth of a sequence reported major flares produced period 2007/mid-2011. These events attributed to strong radiative plasma instabilities inner Nebula, their properties crucial for theoretical studies efficient particle acceleration up 10^15 eV. Here we study very rapid flux spectral evolution that reached April 16, 2011 record-high peak F = (26 +/- 5)...
Fast radio bursts (FRBs) are short (millisecond) pulses originating from enigmatic sources at extragalactic distances so far lacking a detection in other energy bands. Magnetized neutron stars (magnetars) have been considered as the powering FRBs, but connection is controversial because of differing energetics and lack X-ray detections with similar characteristics two classes. We report here by AGILE satellite on April 28, 2020 an burst coincidence very bright Galactic magnetar SGR...
[Abridged] We report on a multiwavelength observation of the blazar 3C 454.3 (which we dubbed "crazy diamond") carried out November 2007 by means astrophysical satellites AGILE, INTEGRAL, Swift, WEBT Consortium, and optical-NIR telescope REM. is detected at $\sim 19-σ$ level during 3-week observing period, with an average flux above 100 MeV $F_{\rm E>100MeV} = (170 \pm 13) \times 10^{-8}$ \phcmsec. The gamma-ray spectrum can be fit single power-law photon index $Γ_{\rm GRID} 1.73 0.16$...
We report the first blazar detection by AGILE. AGILE detected 3C 454.3 during a period of strongly enhanced optical emission in 2007 July. observed source with dedicated repointing July 24-30 its two co-aligned imagers, Gamma-Ray Imaging Detector and hard X-ray imager Super-AGILE sensitive 30 MeV to 50 GeV 18-60 keV ranges, respectively. Over entire period, γ-ray from at significance level 13.8 σ an average flux (E > 100 MeV) (280 ± 40) × 10-8 photons cm-2 s-1. The appears be variable toward...
GRB 080514B is the first gamma ray burst (GRB), since time of EGRET, for which individual photons energy above several tens MeV have been detected with a pair-conversion tracker telescope. This was discovered Italian AGILE gamma-ray satellite. The localized cooperation by and interplanetary network (IPN). imager (GRID) estimate position, obtained before SuperAGILE-IPN localization, found to be consistent position. hard X-ray emission observed SuperAGILE lasted about 7 s, while there evidence...
Cygnus X-1 is the archetypal black hole (BH) binary system in our Galaxy. We report main results of an extensive search for transient gamma-ray emission from carried out energy range 100 MeV - 3 GeV by AGILE satellite, during period 2007 July 2009 October. The total exposure time about 300 days, which source was "hard" X-ray spectral state. divided observing intervals 2 or 4 week periods, and searched persistent emission. episode significant detected on 2009, October 16 a position compatible...