Publications (128)
Constraints on particle acceleration in SS433/W50 from MAGIC and H.E.S.S. observations
MAGIC Collaboration, M. L. Ahnen, S. Ansoldi +408
The large jet kinetic power and non-thermal processes occurring in the microquasar SS 433 make this source a good candidate for a very high-energy (VHE) gamma-ray emitter. Gamma-ra…
Studying the nature of the unidentified gamma-ray source HESS J1841-055 with the MAGIC telescopes
MAGIC Collaboration, V. A. Acciari, S. Ansoldi +184
We investigate the physical nature and origin of the gamma-ray emission from the extended source HESS J1841-055 observed at TeV and GeV energies. We observed HESS J1841-055 at TeV…
A new hybrid gadolinium nanoparticles-loaded polymeric material for neutron detection in rare event searches
20k Collaboration, F. Acerbi, P. Adhikari +311
Experiments aimed at direct searches for WIMP dark matter require highly effective reduction of backgrounds and control of any residual radioactive contamination. In particular, ne…
Study of the variable broadband emission of Markarian 501 during the most extreme Swift X-ray activity
MAGIC Collaboration, V. A. Acciari, S. Ansoldi +185
Mrk501 is a very high-energy (VHE) gamma-ray blazar located at z=0.034. During a period of two weeks in July 2014, the highest X-ray activity of Mrk501 was observed in ~14 years of…
Investigation of the correlation patterns and the Compton dominance variability of Mrk 421 in 2017
MAGIC Collaboration, V. A. Acciari, S. Ansoldi +284
We present a detailed characterisation and theoretical interpretation of the broadband emission of the paradigmatic TeV blazar Mrk 421, with special focus on the multi-band flux co…
First AGILE Catalog of High Confidence Gamma-Ray Sources
C. Pittori, F. Verrecchia, A. W. Chen +80
We present the first catalog of high-confidence gamma-ray sources detected by the AGILE satellite during observations performed from July 9, 2007 to June 30, 2008. Catalogued sourc…
A Fast Very High Energy -ray Flare from BL Lacertae during a Period of Multiwavelength activity in June 2015
MAGIC Collaboration, V. A. Acciari, S. Ansoldi +163
The mechanisms producing fast variability of the -ray emission in active galactic nuclei are under debate. The MAGIC telescopes detected a fast very high energy (VHE, E G…
MAGIC observations of the microquasar V404 Cygni during the 2015 outburst
M. L. Ahnen, S. Ansoldi, L. A. Antonelli +142
The microquasar V404 Cygni underwent a series of outbursts in 2015, June 15-31, during which its flux in hard X-rays (20-40 keV) reached about 40 times the Crab Nebula flux. Becaus…
Measurement of the Extragalactic Background Light using MAGIC and Fermi-LAT gamma-ray observations of blazars up to z = 1
MAGIC collaboration, V. A. Acciari, S. Ansoldi +157
We present a measurement of the extragalactic background light (EBL) based on a joint likelihood analysis of 32 gamma-ray spectra for 12 blazars in the redshift range z = 0.03 to 0…
The blazar TXS 0506+056 associated with a high-energy neutrino: insights into extragalactic jets and cosmic ray acceleration
S. Ansoldi, L. A. Antonelli, C. Arcaro +146
A neutrino with energy of 290 TeV, IceCube-170922A, was detected in coincidence with the BL Lac object TXS~0506+056 during enhanced gamma-ray activity, with chance coincidenc…
Benchmarking the design of the cryogenics system for the underground argon in DarkSide-20k
20k Collaboration, F. Acerbi, P. Adhikari +315
DarkSide-20k (DS-20k) is a dark matter detection experiment under construction at the Laboratori Nazionali del Gran Sasso (LNGS) in Italy. It utilises ~100 t of low radioactivity a…
Temporal properties of GX 301-2 over a year-long observation with SuperAGILE
Y. Evangelista, M. Feroci, E. Costa +52
We present the long-term monitoring of the High Mass X-ray Binary GX 301-2 performed with the SuperAGILE instrument on-board the AGILE mission. The source was monitored in the 20-6…
The detection of the blazar S4 0954+65 at very-high-energy with the MAGIC telescopes during an exceptionally high optical state
MAGIC Collaboration, M. L. Ahnen, S. Ansoldi +169
The very-high-energy (VHE, GeV) -ray MAGIC observations of the blazar S4 0954+65, were triggered by an exceptionally high flux state of emission in the optical. T…
Multiwavelength observations of 3C 454.3 II. The AGILE 2007 December campaign
I. Donnarumma, G. Pucella, V. Vittorini +75
We report on the second AGILE multiwavelength campaign of the blazar 3C 454.3 during the first half of December 2007. This campaign involved AGILE, Spitzer, Swift,Suzaku,the WEBT c…
Observation of a sudden cessation of a very-high-energy gamma-ray flare in PKS 1510-089 with H.E.S.S. and MAGIC in May 2016
H. E. S. S. Collaboration, H. Abdalla, R. Adam +430
The flat spectrum radio quasar (FSRQ) PKS 1510-089 is known for its complex multiwavelength behavior, and is one of only a few FSRQs detected at very high energy (VHE, GeV…
Constraints on gamma-ray and neutrino emission from NGC 1068 with the MAGIC telescopes
MAGIC Collaboration, V. A. Acciari, S. Ansoldi +172
Starburst galaxies and star-forming active galactic nuclei (AGN) are among the candidate sources thought to contribute appreciably to the extragalactic gamma-ray and neutrino backg…
Detection of the Geminga pulsar with MAGIC hints at a power-law tail emission beyond 15 GeV
MAGIC Collaboration, V. A. Acciari, S. Ansoldi +190
We report the detection of pulsed gamma-ray emission from the Geminga pulsar (PSR J0633+1746) between GeV and GeV. This is the first time a middle-aged pulsar has been…
An intermittent extreme BL Lac: MWL study of 1ES 2344+514 in an enhanced state
MAGIC Collaboration, V. A. Acciari, S. Ansoldi +215
Extreme High-frequency BL~Lacs (EHBL) feature their synchrotron peak of the broadband spectral energy distribution (SED) at 10\,Hz. The BL~Lac object 1ES~2…
Investigating the peculiar emission from the new VHE gamma-ray source H1722+119
MAGIC Collaboration, M. L. Ahnen, S. Ansoldi +159
The MAGIC (Major Atmospheric Gamma-ray Imaging Cherenkov) telescopes observed the BL Lac object H1722+119 (redshift unknown) for six consecutive nights between 2013 May 17 and 22,…
Flow and thermal modelling of the argon volume in the DarkSide-20k TPC
20k Collaboration, F. Acerbi, P. Adhikari +300
The DarkSide-20k dark matter experiment, currently under construction at LNGS, features a dual-phase time projection chamber (TPC) with a ~50 t argon target from an underground wel…
Study of the gamma-ray source 1AGL J2022+4032 in the Cygnus Region
A. W. Chen, G. Piano, M. Tavani +58
Identification of gamma-ray-emitting Galactic sources is a long-standing problem in astrophysics. One such source, 1AGL J2022+4032, coincident with the interior of the radio shell…
Indirect dark matter searches in the dwarf satellite galaxy Ursa Major II with the MAGIC Telescopes
MAGIC Collaboration, M. L. Ahnen, S. Ansoldi +142
The dwarf spheroidal galaxy Ursa Major II (UMaII) is believed to be one of the most dark-matter dominated systems among the Milky Way satellites and represents a suitable target fo…
Bounds on Lorentz invariance violation from MAGIC observation of GRB 190114C
MAGIC Collaboration, V. A. Acciari, S. Ansoldi +181
On January 14, 2019, the Major Atmospheric Gamma Imaging Cherenkov telescopes detected GRB 190114C above 0.2 TeV, recording the most energetic photons ever observed from a gamma-ra…
Calibration of AGILE-GRID with In-Flight Data and Monte Carlo Simulations
Andrew W. Chen, A. Argan, A. Bulgarelli +57
Context: AGILE is a gamma-ray astrophysics mission which has been in orbit since 23 April 2007 and continues to operate reliably. The gamma-ray detector, AGILE-GRID, has observed G…
Production, Quality Assurance and Quality Control of the SiPM Tiles for the DarkSide-20k Time Projection Chamber
F. Acerbi, P. Adhikari, P. Agnes +301
The DarkSide-20k dark matter direct detection experiment will employ a 21 m^2 silicon photomultiplier (SiPM) array, instrumenting a dual-phase 50 tonnes liquid argon Time Projectio…
Prospects for GRB Science with the Fermi Large Area Telescope
D. L. Band, M. Axelsson, L. Baldini +54
The LAT instrument on the Fermi mission will reveal the rich spectral and temporal gamma-ray burst phenomena in the > 100 MeV band. The synergy with Fermi's GBM detectors will link…
Subphotospheric heating in GRBs: analysis and modeling of GRB090902B as observed by Fermi
T. Nymark, M. Axelsson, C. Lundman +3
We analyze the spectral evolution of GRB 090902B and show that subphotospheric dissipation can explain both the spectra and the spectral evolution. The emission from a GRB photosph…
Cherenkov Telescope Array Contributions to the 35th International Cosmic Ray Conference (ICRC2017)
F. Acero, B. S. Acharya, V. AcÃn Portella +1137
List of contributions from the Cherenkov Telescope Array Consortium presented at the 35th International Cosmic Ray Conference, July 12-20 2017, Busan, Korea.
Performance of the MAGIC telescopes under moonlight
MAGIC Collaboration, M. L. Ahnen, S. Ansoldi +143
MAGIC, a system of two imaging atmospheric Cherenkov telescopes, achieves its best performance under dark conditions, i.e. in absence of moonlight or twilight. Since operating the…
Multiwavelength Study of Quiescent States of Mrk 421 with Unprecedented Hard X-Ray Coverage Provided by NuSTAR in 2013
M. BalokoviÄ, D. Paneque, G. Madejski +305
We present coordinated multiwavelength observations of the bright, nearby BL Lac object Mrk 421 taken in 2013 January-March, involving GASP-WEBT, Swift, NuSTAR, Fermi-LAT, MAGIC, V…
Discovery of Powerful Gamma-Ray Flares from the Crab Nebula
M. Tavani, A. Bulgarelli, V. Vittorini +65
The well known Crab Nebula is at the center of the SN1054 supernova remnant. It consists of a rotationally-powered pulsar interacting with a surrounding nebula through a relativist…
Direct Evidence for Hadronic Cosmic-Ray Acceleration in the Supernova Renmant IC 443
M. Tavani, A. Giuliani, A. W. Chen +59
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 gamma-ray emi…
Constraining Dark Matter lifetime with a deep gamma-ray survey of the Perseus Galaxy Cluster with MAGIC
MAGIC Collaboration, V. A. Acciari, S. Ansoldi +148
Clusters of galaxies are the largest known gravitationally bound structures in the Universe, with masses around , most of it in the form of dark matter. The groun…
A lower bound on intergalactic magnetic fields from time variability of 1ES 0229+200 from MAGIC and Fermi/LAT observations
MAGIC Collaboration, V. A. Acciari, I. Agudo +206
Extended and delayed emission around distant TeV sources induced by the effects of propagation of gamma rays through the intergalactic medium can be used for the measurement of the…
Testing the ubiquitous presence of very high energy emission in gamma-ray bursts with the MAGIC telescopes
S. Abe, J. Abhir, A. Abhishek +206
Gamma-ray bursts (GRBs) are the most powerful transient objects in the Universe, and they are a primary target for the MAGIC Collaboration. Recognizing the challenges of observing…
Detection of Gamma-Ray Emission from the Vela Pulsar Wind Nebula with AGILE
A. Pellizzoni, A. Trois, M. Tavani +68
Pulsars are known to power winds of relativistic particles that can produce bright nebulae by interacting with the surrounding medium. These pulsar wind nebulae (PWNe) are observed…
The 1st Fermi Lat Supernova Remnant Catalog
Fabio Acero, Markus Ackermann, Marco Ajello +156
To uniformly determine the properties of supernova remnants (SNRs) at high energies, we have developed the first systematic survey at energies from 1 to 100 GeV using data from the…
MAGIC and Fermi-LAT gamma-ray results on unassociated HAWC sources
M. L. Ahnen, S. Ansoldi, L. A. Antonelli +336
The HAWC Collaboration released the 2HWC catalog of TeV sources, in which 19 show no association with any known high-energy (HE; E > 10 GeV) or very-high-energy (VHE; E > 300 GeV)…
Limits on the flux of tau neutrinos from 1 PeV to 3 EeV with the MAGIC telescopes
MAGIC Collaboration, M. L. Ahnen, S. Ansoldi +142
A search for tau neutrino induced showers with the MAGIC telescopes is presented. The MAGIC telescopes located at an altitude of 2200 m a.s.l. in the Canary Island of La Palma, can…
Agile Detection of Delayed Gamma-Ray Emission from the Short Gamma-Ray Burst GRB 090510
A. Giuliani, F. Fuschino, G. Vianello +59
Short gamma-ray bursts (GRBs), typically lasting less than 2 s, are a special class of GRBs of great interest. We report the detection by the AGILE satellite of the short GRB 09051…
Monitoring of the radio galaxy M87 during a low emission state from 2012 to 2015 with MAGIC
MAGIC Collaboration, V. A. Acciari, S. Ansoldi +188
M87 is one of the closest (z=0.00436) extragalactic sources emitting at very-high-energies (VHE, E > 100 GeV). The aim of this work is to locate the region of the VHE gamma-ray emi…
Detection of persistent VHE gamma-ray emission from PKS 1510-089 by the MAGIC telescopes during low states between 2012 and 2017
MAGIC Collaboration, V. A. Acciari, S. Ansoldi +165
PKS 1510-089 is a flat spectrum radio quasar strongly variable in the optical and GeV range. We search for low-state VHE gamma-ray emission from PKS 1510-089. We aim to characteriz…
New hard-TeV extreme blazars detected with the MAGIC telescopes
MAGIC Collaboration, V. A. Acciari, S. Ansoldi +175
Extreme high-frequency peaked BL Lac objects (EHBLs) are blazars which exhibit extremely energetic synchrotron emission. They also feature non-thermal gamma-ray emission whose peak…
Supplement: Localization and broadband follow-up of the gravitational-wave transient GW150914
B. P. Abbott, R. Abbott, T. D. Abbott +1538
This Supplement provides supporting material for arXiv:1602.08492 . We briefly summarize past electromagnetic (EM) follow-up efforts as well as the organization and policy of the c…
Statistics of VHE gamma-Rays in Temporal Association with Radio Giant Pulses from the Crab Pulsar
MAGIC Collaboration, M. L. Ahnen, S. Ansoldi +146
The aim of this study is to search for evidence of a common emission engine between radio giant pulses (GPs) and very-high-energy (VHE, E>100 GeV) gamma-rays from the Crab pulsar.…
Observation of the Black Widow B1957+20 millisecond pulsar binary system with the MAGIC telescopes
MAGIC Collaboration, M. L. Ahnen, S. Ansoldi +145
B1957+20 is a millisecond pulsar located in a black widow type compact binary system with a low mass stellar companion. The interaction of the pulsar wind with the companion star w…
Deep observation of the NGC 1275 region with MAGIC: search of diffuse gamma-ray emission from cosmic rays in the Perseus cluster
MAGIC Collaboration, M. L. Ahnen, S. Ansoldi +154
Clusters of galaxies are expected to be reservoirs of cosmic rays (CRs) that should produce diffuse gamma-ray emission due to their hadronic interactions with the intra-cluster med…
Quality Assurance and Quality Control of the SiPM production for the DarkSide-20k dark matter experiment
F. Acerbi, P. Adhikari, P. Agnes +289
DarkSide-20k is a novel liquid argon dark matter detector currently under construction at the Laboratori Nazionali del Gran Sasso (LNGS) of the Istituto Nazionale di Fisica Nuclear…
Search for very-high-energy gamma-ray emission from the microquasar Cygnus X-1 with the MAGIC telescopes
MAGIC Collaboration, M. L. Ahnen, S. Ansoldi +144
The microquasar Cygnus X-1 displays the two typical soft and hard X-ray states of a black-hole transient. During the latter, Cygnus X-1 shows a one-sided relativistic radio-jet. Re…
AGILE detection of GeV gamma-ray emission from the SNR W28
A. Giuliani, M. Tavani, A. Bulgarelli +59
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 the interaction…
First results about on-ground calibration of the Silicon Tracker for the AGILE satellite
AGILE Collaboration, P. W. Cattaneo, A. Argan +65
The AGILE scientific instrument has been calibrated with a tagged -ray beam at the Beam Test Facility (BTF) of the INFN Laboratori Nazionali di Frascati (LNF). The goal of the…
The extreme HBL behaviour of Markarian 501 during 2012
M. L. Ahnen, S. Ansoldi, L. A. Antonelli +276
A multiwavelength campaign was organized to take place between March and July of 2012. Excellent temporal coverage was obtained with more than 25 instruments, including the MAGIC,…
MAGIC very large zenith angle observations of the Crab Nebula up to 100 TeV
MAGIC Collaboration, V. A. Acciari, S. Ansoldi +169
Aims: We aim to measure the Crab Nebula gamma-ray spectral energy distribution in the ~100 TeV energy domain and test the validity of existing leptonic emission models at these hig…
Deep observations of the globular cluster M15 with the MAGIC telescopes
MAGIC Collaboration, V. A. Acciari, S. Ansoldi +153
A population of globular clusters (GCs) has been recently established by the Fermi-LAT telescope as a new class of GeV -ray sources. Leptons accelerated to TeV energies, in the…
Multiwavelength study of the gravitationally lensed blazar QSO B0218+357 between 2016 and 2020
MAGIC Collaboration, V. A. Acciari, S. Ansoldi +208
We report multiwavelength observations of the gravitationally lensed blazar QSO B0218+357 in 2016-2020. Optical, X-ray and GeV flares were detected. The contemporaneous MAGIC obser…
The broad-band properties of the intermediate synchrotron peaked BL Lac S2 0109+22 from radio to VHE gamma rays
MAGIC Collaboration, S. Ansoldi, L. A. Antonelli +163
The MAGIC telescopes observed S2 0109+22 in 2015 July during its flaring activity in high energy gamma rays observed by Fermi-LAT. We analyse the MAGIC data to characterise the ver…
The characterization of the distant blazar GB6 J1239+0443 from flaring and low activity periods
L. Pacciani, I. Donnarumma, K. D. Denney +64
In 2008 AGILE and Fermi detected gamma-ray flaring activity from the unidentified EGRET source 3EG J1236+0457, recently associated with a flat spectrum radio quasar GB6 J1239+0443…
Multi-wavelength characterization of the blazar S5~0716+714 during an unprecedented outburst phase
MAGIC Collaboration, M. L. Ahnen, S. Ansoldi +187
The BL Lac object S5~0716+714, a highly variable blazar, underwent an impressive outburst in January 2015 (Phase A), followed by minor activity in February (Phase B). The MAGIC obs…
Directionality of nuclear recoils in a liquid argon time projection chamber
20k Collaboration, P. Agnes, I. Ahmad +264
The direct search for dark matter in the form of weakly interacting massive particles (WIMP) is performed by detecting nuclear recoils (NR) produced in a target material from the W…
Observation of the gamma-ray binary HESS J0632+057 with the H.E.S.S., MAGIC, and VERITAS telescopes
C. B. Adams, W. Benbow, A. Brill +409
The results of gamma-ray observations of the binary system HESS J0632+057 collected during 450 hours over 15 years, between 2004 and 2019, are presented. Data taken with the atmosp…
Gamma-Ray Localization of Terrestrial Gamma-Ray Flashes
M. Marisaldi, A. Argan, A. Trois +59
Terrestrial Gamma-Ray Flashes (TGFs) are very short bursts of high energy photons and electrons originating in Earth's atmosphere. We present here a localization study of TGFs carr…
Observation of polarised hard X-ray emission from the Crab by the PoGOLite Pathfinder
M. Chauvin, H. -G. Florén, M. Jackson +19
We have measured the linear polarisation of hard X-ray emission from the Crab in a previously unexplored energy interval, 20-120 keV. The introduction of two new observational para…
A search for dark matter in Triangulum II with the MAGIC telescopes
MAGIC Collaboration, V. A. Acciari, S. Ansoldi +172
We present the first results from very-high-energy observations of the dwarf spheroidal satellite candidate Triangulum II with the MAGIC telescopes from 62.4 hours of good-quality…
Discovery of TeV -ray emission from the neighbourhood of the supernova remnant G24.7+0.6 by MAGIC
MAGIC Collaboration, V. A. Acciari, S. Ansoldi +151
SNR G24.7+0.6 is a 9.5 kyrs radio and -ray supernova remnant evolving in a dense medium. In the GeV regime, SNR G24.7+0.6 (3FHL\,J1834.1--0706e/FGES\,J1834.1--0706) shows a har…
First detection of VHE gamma-ray emission from TXS~1515--273, study of its X-ray variability and spectral energy distribution
MAGIC Collaboration, V. A. Acciari, S. Ansoldi +196
We report here on the first multi-wavelength (MWL) campaign on the blazar TXS 1515-273, undertaken in 2019 and extending from radio to very-high-energy gamma rays (VHE). Up until n…
Observations of Sagittarius A* during the pericenter passage of the G2 object with MAGIC
M. L. Ahnen, S. Ansoldi, L. A. Antonelli +153
Context. We present the results of a multi-year monitoring campaign of the Galactic Center (GC) with the MAGIC telescopes. These observations were primarily motivated by reports th…
First Multi-wavelength Campaign on the Gamma-ray-loud Active Galaxy IC 310
M. L. Ahnen, S. Ansoldi, L. A. Antonelli +160
The extragalactic VHE gamma-ray sky is rich in blazars. These are jetted active galactic nuclei viewed at a small angle to the line-of-sight. Only a handful of objects viewed at a…
An updated list of AGILE bright gamma-ray sources and their variability in pointing mode
F. Verrecchia, C. Pittori, A. W. Chen +76
We present a variability study of a sample of bright gamma-ray (30 MeV -- 50 GeV) sources. This sample is an extension of the first AGILE catalogue of gamma-ray sources (1AGL), obt…
Multiwavelength variability and correlation studies of Mrk 421 during historically low X-ray and -ray activity in 20152016
MAGIC Collaboration, V. A. Acciari, S. Ansoldi +224
We report a characterization of the multi-band flux variability and correlations of the nearby (z=0.031) blazar Markarian 421 (Mrk 421) using data from Metsähovi, Swift, Fermi-LAT…
Unravelling the complex behavior of Mrk 421 with simultaneous X-ray and VHE observations during an extreme flaring activity in April 2013
MAGIC collaboration, V. A. Acciari, S. Ansoldi +237
We report on a multi-band variability and correlation study of the TeV blazar Mrk 421 during an exceptional flaring activity observed from 2013 April 11 to 2013 April 19. The study…
Study of the GeV to TeV morphology of the -Cygni SNR (G78.2+2.1) with MAGIC and Fermi-LAT
MAGIC Collaboration, V. A. Acciari, S. Ansoldi +183
Context. Diffusive shock acceleration (DSA) is the most promising mechanism to accelerate Galactic cosmic rays (CRs) in the shocks of supernova remnants (SNRs). The turbulence upst…
Constraining Lorentz invariance violation using the Crab Pulsar emission observed up to TeV energies by MAGIC
MAGIC Collaboration, M. L. Ahnen, S. Ansoldi +142
Spontaneous breaking of Lorentz symmetry at energies on the order of the Planck energy or lower is predicted by many quantum gravity theories, implying non-trivial dispersion relat…
Commissioning of the camera of the first Large Size Telescope of the Cherenkov Telescope Array
T. Saito, C. Delgado, O. Blanch +30
The first Large Size Telescope (LST-1) of the Cherenkov Telescope Array has been operational since October 2018 at La Palma, Spain. We report on the results obtained during the cam…
Performance and radiation damage mitigation strategy for silicon photomultipliers on LEO space missions
L. Burmistrov, S. Davarpanah, M. Heller +13
Space missions require lightweight, low-power consuming, radiation-tolerant components. Silicon photomultipliers are increasingly used for detecting near-UV, optical, and infrared…
MAGIC observations of the diffuse -ray emission in the vicinity of the Galactic Centre
MAGIC Collaboration, V. A. Acciari, S. Ansoldi +173
Aims: rays can be used as a tracer in the search of sources of Galactic cosmic rays (CRs). We present deep observations of the Galactic Centre (GC) region with the MAGIC teles…
MAGIC Contributions to the 35th International Cosmic Ray Conference (ICRC2017)
MAGIC Collaboration, M. L. Ahnen, S. Ansoldi +143
MAGIC (Major Atmospheric Gamma Imaging Cherenkov) is a system of two 17 m diameter, F/1.03 Imaging Atmospheric Cherenkov Telescopes (IACT). They are dedicated to the observation of…
Constraining very-high-energy and optical emission from FRB 121102 with the MAGIC telescopes
MAGIC Collaboration, V. A. Acciari, S. Ansoldi +155
Fast radio bursts (FRBs) are bright flashes observed typically at GHz frequencies with millisecond duration, whose origin is likely extragalactic. Their nature remains mysterious,…
Gamma-ray flaring activity of NGC 1275 in 2016-2017 measured by MAGIC
MAGIC collaboration, S. Ansoldi, L. A. Antonelli +152
We report on the detection of flaring activity from the Fanaroff-Riley I radio galaxy NGC 1275 in very-high-energy (VHE, E 100 GeV) gamma rays with the MAGIC telescopes. Observ…
A year-long AGILE observation of Cygnus X-1 in hard spectral state
E. Del Monte, M. Feroci, Y. Evangelista +52
We present the observation of Cyg X-1 in hard spectral state performed during the AGILE Science Verification Phase and Observing Cycle 1 in hard X-rays (with SuperAGILE) and gamma…
Observation of GRBs with AGILE
M. Marisaldi, G. Barbiellini, E. Costa +21
Since its early phases of operation, the AGILE satellite is observing Gamma Ray Bursts (GRBs) over an energy range potentially spanning six orders of magnitude. In the hard X-ray b…
A cut-off in the TeV gamma-ray spectrum of the SNR Cassiopeia A
MAGIC Collaboration, M. L. Ahnen, S. Ansoldi +141
It is widely believed that the bulk of the Galactic cosmic rays are accelerated in supernova remnants (SNRs). However, no observational evidence of the presence of particles of PeV…
Very High-Energy Gamma-Ray Follow-Up Program Using Neutrino Triggers from IceCube
IceCube Collaboration, M. G. Aartsen, K. Abraham +537
We describe and report the status of a neutrino-triggered program in IceCube that generates real-time alerts for gamma-ray follow-up observations by atmospheric-Cherenkov telescope…
Preflight performance studies of the PoGOLite hard X-ray polarimeter
M. Chauvin, M. Jackson, T. Kawano +6
Polarimetric studies of astrophysical sources can make important contributions to resolve the geometry of the emitting region and determine the photon emission mechanism. PoGOLite…
Episodic Transient Gamma-Ray Emission from the Microquasar Cygnus X-1
S. Sabatini, M. Tavani, E. Striani +58
Cygnus X-1 is the archetypal black hole (BH) binary system in our Galaxy. We report the main results of an extensive search for transient gamma-ray emission from Cygnus X-1 carried…
AGILE detection of Cygnus X-3 γ-ray active states during the period mid-2009/mid-2010
A. Bulgarelli, M. Tavani, A. W. Chen +70
Cygnus X-3 (Cyg X-3) is a well-known microquasar producing variable emission at all wavelengths. Cyg X-3 is a prominent X-ray binary producing relativistic jets, and studying its h…
Combined searches for dark matter in dwarf spheroidal galaxies observed with the MAGIC telescopes, including new data from Coma Berenices and Draco
MAGIC Collaboration, V. A. Acciari, S. Ansoldi +191
Milky Way dwarf spheroidal galaxies (dSphs) are among the best candidates to search for signals of dark matter annihilation with Imaging Atmospheric Cherenkov Telescopes, given the…
Broadband characterisation of the very intense TeV flares of the blazar 1ES 1959+650 in 2016
MAGIC Collaboration, V. A. Acciari, S. Ansoldi +164
1ES 1959+650 is a bright TeV high-frequency-peaked BL Lac object exhibiting interesting features like "orphan" TeV flares and a broad emission in the high-energy regime, that are d…
Detection of very high energy gamma-ray emission from the gravitationally-lensed blazar QSO B0218+357 with the MAGIC telescopes
MAGIC Collaboration, M. L. Ahnen, S. Ansoldi +151
Context. QSO B0218+357 is a gravitationally lensed blazar located at a redshift of 0.944. The gravitational lensing splits the emitted radiation into two components, spatially indi…
MAGIC detection of very high energy gamma-ray emission from the low-luminosity blazar 1ES 1741+196
MAGIC Collaboration, M. L. Ahnen, S. Ansoldi +159
We present the first detection of the nearby (z=0.084) low-luminosity BL Lac object 1ES 1741+196 in the very high energy (VHE: E100 GeV) band. This object lies in a triplet of i…
MAGIC observations of the February 2014 flare of 1ES 1011+496 and ensuing constraint of the EBL density
M. L. Ahnen, S. Ansoldi, L. A. Antonelli +144
In February-March 2014, the MAGIC telescopes observed the high-frequency peaked BL Lac 1ES 1011+496 (z=0.212) in flaring state at very-high energy (VHE, E>100GeV). The flux reached…
Proton acceleration in thermonuclear nova explosions revealed by gamma rays
MAGIC Collaboration, V. A. Acciari, S. Ansoldi +208
Classical novae are cataclysmic binary star systems in which the matter of a companion star is accreted on a white dwarf (WD). Accumulation of hydrogen in a layer eventually causes…
Investigating the blazar TXS 0506+056 through sharp multi-wavelength eyes during 2017-2019
MAGIC Collaboration, V. A. Acciari, T. Aniello +213
The blazar TXS 0506+056 got into the spotlight of the astrophysical community in September 2017, when a high-energy neutrino detected by IceCube (IceCube-170922A) was associated at…
The extraordinary gamma-ray flare of the blazar 3C 454.3
E. Striani, S. Vercellone, M. Tavani +56
We present the gamma-ray data of the extraordinary flaring activity above 100 MeV from the flat spectrum radio quasar 3C 454.3 detected by AGILE during the month of December 2009.…
Search for Very High-Energy Emission from the millisecond pulsar PSR J0218+4232
V. A. Acciari, S. Ansoldi, L. A. Antonelli +198
PSR J0218+4232 is one of the most energetic millisecond pulsars known and has long been considered as one of the best candidates for very high-energy (VHE; >100 GeV) gamma-ray emis…
Search for VHE gamma-ray emission from Geminga pulsar and nebula with the MAGIC telescopes
M. L. Ahnen, S. Ansoldi, L. A. Antonelli +152
The Geminga pulsar, one of the brighest gamma-ray sources, is a promising candidate for emission of very-high-energy (VHE > 100 GeV) pulsed gamma rays. Also, detection of a large n…
The observation of Gamma Ray Bursts and Terrestrial Gamma-ray Flashes with AGILE
E. Del Monte, G. Barbiellini, F. Fuschino +50
Since its early phases of operation, the AGILE mission is successfully observing Gamma Ray Bursts (GRBs) in the hard X-ray band with the SuperAGILE imager and in the MeV range with…
The December 2009 gamma-ray flare of 3C 454.3: the multifrequency campaign
L. Pacciani, V. Vittorini, M. Tavani +81
During the month of December, 2009 the blazar 3C 454.3 became the brightest gamma-ray source in the sky, reaching a peak flux F ~2000E-8 ph/cm2/s for E > 100 MeV. Starting in Novem…
Multiwavelength observations of a VHE gamma-ray flare from PKS 1510-089 in 2015
MAGIC Collaboration, M. L. Ahnen, S. Ansoldi +172
Context. PKS 1510-089 is one of only a few flat spectrum radio quasars detected in the VHE (very-high-energy, > 100 GeV) gamma-ray band. Aims. We study the broadband spectral and t…
Monitoring the hard X-ray sky with SuperAGILE
M. Feroci, E. Costa, E. Del Monte +77
SuperAGILE is the hard X-ray monitor of the AGILE gamma ray mission, in orbit since 23 April 2007. It is an imaging experiment based on a set of four independent silicon str…
Multiband variability studies and novel broadband SED modeling of Mrk 501 in 2009
M. L. Ahnen, S. Ansoldi, L. A. Antonelli +290
We present an extensive study of the BL Lac object Mrk 501 based on a data set collected during the multi-instrument campaign spanning from 2009 March 15 to 2009 August 1 which inc…