207 citations · 1.4k across the 39 of their papers we have counts for
32 papers · 1 filter
X-ray spectra, light-curves and SEDs of blazars frequently observed by Swift
P. Giommi, M. Perri, M. Capalbi +19
Blazars research is one of the hot topics of contemporary extra-galactic astrophysics. That is because these sources are the most abundant type of extra-galactic gamma-ray sources…
Study of Blazar activity in 10 year Fermi-LAT data and implications for TeV neutrino expectations
J. R. Sacahui, A. V. Penacchioni, A. Marinelli +4
Blazars are the most active extragalactic gamma-ray sources. They show sporadic bursts of activity, lasting from hours to months. In this work we present a 10-year analysis of a sa…
The Open Universe survey of Swift-XRT GRB fields: a complete sample of HBL blazars
P. Giommi, Y. L. Chang, S. Turriziani +22
We have analysed all the X-ray images centred on Gamma Ray Bursts generated by Swift over the last 15 years using automatic tools that do not require any expertise in X-ray astrono…
Direct Measurement of the Cosmic-Ray Proton Spectrum from 50 GeV to 10 TeV with the Calorimetric Electron Telescope on the International Space Station
O. Adriani, Y. Akaike, K. Asano +86
In this paper, we present the analysis and results of a direct measurement of the cosmic-ray proton spectrum with the CALET instrument onboard the International Space Station, incl…
Time-delay between neutrinos and gamma-rays in short GRBs
A. V. Penacchioni, O. Civitarese
In this work we make an estimate of the time-delay between signals, recorded at detectors on Earth, of neutrinos and photons originated in a short gamma-ray burst. We describe the…
Neutrino oscillations and decoherence in short-GRB progenitors
A. V. Penacchioni, O. Civitarese
Neutrinos are produced in cosmic accelerators, like active galactic nuclei (AGNs), blazars, supernova (SN) remnants and gamma-ray bursts (GRBs). On their way to the Earth they expe…
Extragalactic neutrinos as tracers of Dark Matter?
Ana V. Penacchioni, Osvaldo Civitarese
Neutrinos produced in extragalactic sources may experience flavor-oscillations and decoherence on their way to Earth due to their interaction with dark matter (DM). As a result, th…
Open Universe for Blazars: a new generation of astronomical products based on 14 years of Swift-XRT data
P. Giommi, C. H. Brandt, U. Barres de Almeida +14
Open Universe for blazars is a set of high-transparency data products for blazar science, and the tools designed to generate them. Blazar astrophysics is becoming increasingly data…
The CALorimetric Electron Telescope (CALET) on the International Space Station: Results from the First Two Years On Orbit
Y. Asaoka, O. Adriani, Y. Akaike +90
The CALorimetric Electron Telescope (CALET) is a high-energy astroparticle physics space experiment installed on the International Space Station (ISS), developed and operated by Ja…
Search for GeV Gamma-ray Counterparts of Gravitational Wave Events by CALET
O. Adriani, Y. Akaike, K. Asano +88
We present results on searches for gamma-ray counterparts of the LIGO/Virgo gravitational-wave events using CALorimetric Electron Telescope ({\sl CALET}) observations. The main ins…
Extended Measurement of the Cosmic-Ray Electron and Positron Spectrum from 11 GeV to 4.8 TeV with the Calorimetric Electron Telescope on the International Space Station
O. Adriani, Y. Akaike, K. Asano +88
Extended results on the cosmic-ray electron + positron spectrum from 11 GeV to 4.8 TeV are presented based on observations with the Calorimetric Electron Telescope (CALET) on the I…
Detection of the thermal component in GRB 160107A
Yuta Kawakubo, Takanori Sakamoto, Satoshi Nakahira +14
We present the detection of a blackbody component in GRB 160107A emission by using the combined spectral data of the CALET Gamma-ray Burst Monitor (CGBM) and the MAXI Gas Slit Came…
Energy Spectrum of Cosmic-ray Electron and Positron from 10 GeV to 3 TeV Observed with the Calorimetric Electron Telescope on the International Space Station
O. Adriani, Y. Akaike, K. Asano +88
First results of a cosmic-ray electron + positron spectrum, from 10 GeV to 3 TeV, is presented based upon observations with the CALET instrument on the ISS starting in October, 201…
GRB 081024B and GRB 140402A: two additional short GRBs from binary neutron star mergers
Y. Aimuratov, R. Ruffini, M. Muccino +6
Theoretical and observational evidences have been recently gained for a two-fold classification of short bursts: 1) short gamma-ray flashes (S-GRFs), with isotropic energy $E_{iso}…
Early X-ray Flares in GRBs
R. Ruffini, Y. Wang, Y. Aimuratov +17
We analyze the early X-ray flares in the GRB "flare-plateau-afterglow" (FPA) phase observed by Swift-XRT. The FPA occurs only in one of the seven GRB subclasses: the binary-driven…
CALET Upper Limits on X-ray and Gamma-ray Counterparts of GW 151226
O. Adriani, Y. Akaike, K. Asano +89
We present upper limits in the hard X-ray and gamma-ray bands at the time of the LIGO gravitational-wave event GW 151226 derived from the CALorimetric Electron Telescope (CALET) ob…
Probing the emission physics and weak/soft population of Gamma-Ray Bursts with LOFT
L. Amati, G. Stratta, J. -L. Atteia +36
This is a White Paper in support of the mission concept of the Large Observatory for X-ray Timing (LOFT), proposed as a medium-sized ESA mission. We discuss the potential of LOFT f…
GRB 140619B: a short GRB from a binary neutron star merger leading to black hole formation
R. Ruffini, M. Muccino, M. Kovacevic +8
We show the existence of two families of short GRBs, both originating from the merger of binary neutron stars (NSs): family-1 with erg, leading to a massive NS as…
On Binary Driven Hypernovae and their nested late X-ray emission
R. Ruffini, M. Muccino, C. L. Bianco +7
Context: The induced gravitational collapse (IGC) paradigm addresses the very energetic (10^{52}-10^{54}erg) long gamma-ray bursts (GRBs) associated to supernovae (SNe). Unlike the…
GRB 130427A and SN 2013cq: A Multi-wavelength Analysis of An Induced Gravitational Collapse Event
R. Ruffini, Y. Wang, M. Kovacevic +6
We have performed our data analysis of the observations by Swift and Fermi satellites in order to probe the induced gravitational collapse (IGC) paradigm for GRBs associated with s…
Induced Gravitational Collapse in the BATSE era: the case of GRB 970828
R. Ruffini, Jorge A. Rueda, C. Barbarino +8
Following the recently established "Binary-driven HyperNova" (BdHN) paradigm, we here interpret GRB 970828 in terms of the four episodes typical of such a model. The "Episode 1", u…
On a novel distance indicator for Gamma-Ray Bursts associated with Supernovae
Giovanni Battista Pisani, Luca Izzo, Remo Ruffini +5
It has been proposed that the temporal coincidence of a gamma-ray burst (GRB) and a type Ib/c supernova (SN) can be explained with the concept of induced gravitational collapse (IG…
GRB 090510: a disguised short GRB with the highest Lorentz factor and circumburst medium
M. Muccino, R. Ruffini, C. L. Bianco +3
GRB 090510, observed both by Fermi and AGILE satellites, is the first bright short-hard Gamma-Ray Burst (GRB) with an emission from the keV up to the GeV energy range. Within the F…
Novel distance indicator for gamma-ray bursts associated with supernovae
G. B. Pisani, L. Izzo, R. Ruffini +5
Context. It has been proposed that the temporal coincidence of a gamma-ray burst (GRB) and a type Ib/c supernova (SN) can be explained with the concept of induced gravitational col…