Publications (267)
Fermi LAT Search for Dark Matter in Gamma-ray Lines and the Inclusive Photon Spectrum
LAT Collaboration, M. Ackermann, M. Ajello +117
Dark matter particle annihilation or decay can produce monochromatic gamma-ray lines and contribute to the diffuse gamma-ray background. Flux upper limits are presented for gamma-r…
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…
MAGIC discovery of VHE Emission from the FSRQ PKS 1222+21
J. AleksiÄ, L. Antonelli, P. Antoranz +146
Very High Energy (VHE) gamma-ray emission from the flat spectrum radio quasar (FSRQ) PKS 1222+21 (4C 21.35, z=0.432) was detected with the MAGIC Cherenkov telescopes during a short…
Detection of the distant quasar OP 313 with the first Large-Sized Telescope of CTAO
K. Abe, S. Abe, J. Abhir +412
In December 2023, the Large-Sized Telescope prototype (LST-1) detected for the first time VHE -ray emission from the FSRQ OP~313 becoming the furthest blazar ever observed at V…
Gamma-ray blazar spectra with H.E.S.S. II mono analysis: the case of PKS 2155-304 and PG 1553+113
H. E. S. S. Collaboration, :, H. Abdalla +332
The addition of a 28 m Cherenkov telescope (CT5) to the H.E.S.S. array extended the experiment's sensitivity to lower energies. The lowest energy threshold is obtained using monosc…
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…
Optimized dark matter searches in deep observations of Segue 1 with MAGIC
J. AleksiÄ, S. Ansoldi, L. A. Antonelli +156
We present the results of stereoscopic observations of the satellite galaxy Segue 1 with the MAGIC Telescopes, carried out between 2011 and 2013. With almost 160 hours of good-qual…
Observations of the Crab Nebula and Pulsar with the Large-Sized Telescope Prototype of the Cherenkov Telescope Array
CTA-LST Project, :, H. Abe +289
CTA (Cherenkov Telescope Array) is the next generation ground-based observatory for gamma-ray astronomy at very-high energies. The Large-Sized Telescope prototype (LST-1) is locate…
Calorimeter-only analysis of the Fermi Large Area Telescope
M. Takahashi, R. Caputo, D. Paneque +1
Above tens of GeV, gamma-ray observations with the Fermi Large Area Telescope (LAT) can be dominated by statistical uncertainties due to the low flux of sources and the limited acc…
Extreme Blazars Observed with MAGIC: Second Catalog Release
K. Abe, S. Abe, J. Abhir +353
Extremely high-peaked BL Lac objects - also named extreme blazars - are among the most energetic and persistent extragalactic accelerators in the Universe, defined by a synchrotron…
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…
Simultaneous multi-wavelength campaign on PKS 2005-489 in a high state
The H. E. S. S. Collaboration, the Fermi LAT Collaboration, : +345
The high-frequency peaked BL Lac object PKS 2005-489 was the target of a multi-wavelength campaign with simultaneous observations in the TeV gamma-ray (H.E.S.S.), GeV gamma-ray (Fe…
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…
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,…
Fermi Large Area Telescope Performance After 10 Years Of Operation
The Fermi LAT Collaboration, M. Ajello, W. B. Atwood +126
The Large Area Telescope (LAT), the primary instrument for the Fermi Gamma-ray Space Telescope (Fermi) mission, is an imaging, wide field-of-view, high-energy gamma-ray telescope,…
Long-term multi-wavelength study of 1ES 0647+250
MAGIC Collaboration, V. A. Acciari, T. Aniello +217
The BL Lac object 1ES 0647+250 is one of the few distant -ray emitting blazars detected at very high energies (VHE, 100 GeV) during a non-flaring state. It was detecte…
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…
The Simultaneous Low State Spectral Energy Distribution of 1ES 2344+514 from Radio to Very High Energies
MAGIC Collaboration, J. AleksiÄ, L. A. Antonelli +191
[Abridged] Context. To construct and interpret the spectral energy distribution (SED) of BL Lacertae objects, simultaneous broad-band observations are mandatory. Aims. We present t…
Search for extended sources in the Galactic Plane using 6 years of Fermi-Large Area Telescope Pass 8 data above 10 GeV
The Fermi LAT Collaboration, M. Ackermann, M. Ajello +117
The spatial extension of a gamma-ray source is an essential ingredient to determine its spectral properties as well as its potential multi-wavelength counterpart. The capability to…
Development of the Model of Galactic Interstellar Emission for Standard Point-Source Analysis of Fermi Large Area Telescope Data
F. Acero, M. Ackermann, M. Ajello +131
Most of the celestial gamma rays detected by the Large Area Telescope (LAT) aboard the Fermi Gamma-ray Space Telescope originate from the interstellar medium when energetic cosmic…
Probing the very-high-energy gamma-ray spectral curvature in the blazar PG 1553+113 with the MAGIC telescopes
MAGIC Collaboration, J. AleksiÄ, S. Ansoldi +152
PG 1553+113 is a very-high-energy (VHE, ) -ray emitter classified as a BL Lac object. Its redshift is constrained by intergalactic absorption lines in the…
Cosmic-ray acceleration and escape from supernova remnant W44 as probed by Fermi-LAT and MAGIC
S. Abe, J. Abhir, A. Abhishek +218
Context. The supernova remnant (SNR) W44 and its surroundings are a prime target for studying the acceleration of cosmic rays (CRs). Several previous studies established an extende…
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…
Limits on Dark Matter Annihilation Signals from the Fermi LAT 4-year Measurement of the Isotropic Gamma-Ray Background
The Fermi LAT Collaboration, M. Ackermann, M. Ajello +110
We search for evidence of dark matter (DM) annihilation in the isotropic gamma-ray background (IGRB) measured with 50 months of Fermi Large Area Telescope (LAT) observations. An im…
MAGIC observations provide compelling evidence of the hadronic multi-TeV emission from the putative PeVatron SNR G106.3+2.7
MAGIC Collaboration, H. Abe, S. Abe +214
The SNR G106.3+2.7, detected at 1--100 TeV energies by different -ray facilities, is one of the most promising PeVatron candidates. This SNR has a cometary shape which can be d…
Detection of the Characteristic Pion-Decay Signature in Supernova Remnants
LAT collaboration, M. Ackermann, M. Ajello +167
Cosmic rays are particles (mostly protons) accelerated to relativistic speeds. Despite wide agreement that supernova remnants (SNRs) are the sources of galactic cosmic rays, unequi…
VHE gamma-ray emission from the FSRQs observed by the MAGIC telescopes
E. Lindfors, K. Nilsson, U. Barres de Almeida +16
Among more than fifty blazars detected in very high energy (VHE, E>100GeV) gamma-rays, only three belong to the subclass of Flat Spectrum Radio Quasars (FSRQs): PKS 1510-089, PKS 1…
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…
Discovery of VHE gamma-ray emission from the BL Lac object B3 2247+381 with the MAGIC telescopes
The MAGIC Collaboration, J. AleksiÄ, E. A. Alvarez +156
We study the non-thermal jet emission of the BL Lac object B3 2247+381 during a high optical state. The MAGIC telescopes observed the source during 13 nights between September 30th…
Prompt Searches for Very-High-Energy γ-Ray Counterparts to IceCube Astrophysical Neutrino Alerts
J. Abhir, A. Biland, K. Brand +817
The search for sources of high-energy astrophysical neutrinos can be significantly advanced through a multi-messenger approach, which seeks to detect the gamma rays that accompany…
Unresolved Gamma-Ray Sky through its Angular Power Spectrum
M. Ackermann, M. Ajello, L. Baldini +107
The gamma-ray sky has been observed with unprecedented accuracy in the last decade by the Fermi large area telescope (LAT), allowing us to resolve and understand the high-energy Un…
Chasing Gamma-Ray Signals from Binary Neutron Star Coalescences with the Cherenkov Telescope Array: Prospects and Observing Strategies
S. Abe, J. Abhir, A. Abhishek +457
The detection of gravitational waves (GWs) from a binary neutron star (BNS) merger by Advanced LIGO and Advanced Virgo (GW170817), together with its electromagnetic counterpart, th…
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…
The MAGIC Project: Contributions to ICRC 2007
J. Albert, E. Aliu, H. Anderhub +142
The MAGIC Project: Contributions to ICRC 2007, Merida, Mexico. Contents pages for the Contribution on behalf of the MAGIC Collaboration to the 30th ICRC that took place in July 200…
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.…
Multi-Physics of AGN Jets in the Multi-Messenger Era
B. Rani, M. Petropoulou, H. Zhang +20
Active galactic nuclei (AGN) with relativistic jets, powered by gas accretion onto their central supermassive black hole (SMBH), are unique laboratories for studying the physics of…
Gamma-ray light curve and VLBI polarization connection in Mrk 421
M. Giroletti, F. D'Ammando, M. Orienti +6
We present Fermi-LAT and multi-frequency, multi-epoch VLBA data for the TeV blazar Mrk421. We collected the data during a long and intensive multi-frequency campaign in 2011. We st…
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…
Discovery of TeV gamma-ray emission from the pulsar wind nebula 3C 58 by MAGIC
MAGIC Collaboration, J. AleksiÄ, S. Ansoldi +145
The pulsar wind nebula (PWN) 3C 58 is one of the historical very-high-energy (VHE; E>100 GeV) gamma-ray source candidates. It is energized by one of the highest spin-down power pul…
Performance of the MAGIC stereo system obtained with Crab Nebula data
MAGIC Collaboration, J. AleksiÄ, E. A. Alvarez +153
MAGIC is a system of two Imaging Atmospheric Cherenkov Telescopes located in the Canary island of La Palma. Since autumn 2009 both telescopes have been working together in stereosc…
Very Long Baseline polarimetry and the gamma-ray connection in Markarian 421 during the broadband campaign in 2011
R. Lico, M. Giroletti, M. Orienti +16
We analyzed data in polarized intensity obtained with the Very Long Baseline Array (VLBA) at twelve epochs (one observation per month from January to December 2011) at 15, 24, and…
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,…
VERITAS and Fermi-LAT observations of new HAWC sources
VERITAS Collaboration, A. U. Abeysekara, A. Archer +280
The HAWC (High Altitude Water Cherenkov) collaboration recently published their 2HWC catalog, listing 39 very high energy (VHE; >100~GeV) gamma-ray sources based on 507 days of obs…
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…
Discovery of very high energy gamma-ray emission from the blazar 1ES 0033+595 by the MAGIC telescopes
J. AleksiÄ, S. Ansoldi, L. A. Antonelli +157
The number of known very high energy (VHE) blazars is , which is very small in comparison to the number of blazars detected in other frequencies. This situation is a hand…
Spectral Energy Distribution of Markarian 501: Quiescent State vs. Extreme Outburst
The VERITAS Collaboration, V. A. Acciari, T. Arlen +225
The very high energy (VHE; E > 100 GeV) blazar Markarian 501 has a well-studied history of extreme spectral variability and is an excellent laboratory for studying the physical pro…
Puzzling Variation of Gamma Rays from the Sun over the Solar Cycle Revealed with Fermi-LAT
A. Acharyya, A. Adelfio, M. Ajello +100
The steady-state gamma-ray emission from the Sun is thought to consist of two emission components due to interactions with Galactic cosmic rays: (1) a hadronic disk component, and…
Detection of the Geminga pulsar at energies down to 20 GeV with the LST-1 of CTAO
The CTAO-LST Project, :, K. Abe +331
Geminga is the third gamma-ray pulsar firmly detected by imaging atmospheric Cherenkov telescopes (IACTs) after the Crab and the Vela pulsars. Most of its emission is expected at t…
Constraining Cosmic Rays and Magnetic Fields in the Perseus Galaxy Cluster with TeV observations by the MAGIC telescopes
MAGIC Collaboration, J. AleksiÄ, E. A. Alvarez +161
Galaxy clusters are being assembled today in the most energetic phase of hierarchical structure formation which manifests itself in powerful shocks that contribute to a substantial…
The Cherenkov Telescope Array Large Size Telescope
G. Ambrosi, Y. Awane, H. Baba +129
The two arrays of the Very High Energy gamma-ray observatory Cherenkov Telescope Array (CTA) will include four Large Size Telescopes (LSTs) each with a 23 m diameter dish and 28 m…
Insights from the first flaring activity of a high-synchrotron-peaked blazar with X-ray polarization and VHE gamma rays
MAGIC Collaboration, K. Abe, S. Abe +250
We study a flaring activity of the HSP Mrk421 that was characterized from radio to very-high-energy (VHE; E TeV) gamma rays with MAGIC, Fermi-LAT, Swift, XMM-Newton and sever…
MAGIC observations of MWC 656, the only known Be/BH system
J. AleksiÄ, S. Ansoldi, L. A. Antonelli +149
Context: MWC 656 has recently been established as the first observationally detected high-mass X-ray binary system containing a Be star and a black hole (BH). The system has been a…
Constraints on axion-like particles with the Perseus Galaxy Cluster with MAGIC
MAGIC Collaboration, H. Abe, S. Abe +211
Axion-like particles (ALPs) are pseudo-Nambu-Goldstone bosons that emerge in various theories beyond the standard model. These particles can interact with high-energy photons in ex…
MAGIC contributions to the 32nd International Cosmic Ray Conference
MAGIC Collaboration, J. AleksiÄ, E. A. Alvarez +160
Compilation of the papers contributed by the MAGIC collaboration to the 32nd International Cosmic Ray Conference (ICRC 2011), which took place between August 11 and 18, 2011 in Bei…
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…
Broadband multiwavelength properties of the archetypal blazar 3C 279 during the 2017 Event Horizon Telescope campaign
G. Principe, J. C. Algaba, E. Aviano +529
The archetypal blazar 3C 279 hosts a prominent relativistic jet and exhibits strong broadband variability across the electromagnetic spectrum. In April 2017, the Event Horizon Tele…
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…
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…
The second catalog of flaring gamma-ray sources from the Fermi All-sky Variability Analysis
S. Abdollahi, M. Ackermann, M. Ajello +124
We present the second catalog of flaring gamma-ray sources (2FAV) detected with the Fermi All-sky Variability Analysis (FAVA), a tool that blindly searches for transients over the…
VLBA monitoring of Mrk 421 at 15 GHz and 24 GHz during 2011
R. Lico, M. Giroletti, M. Orienti +13
High-resolution radio observations are ideal for constraining the value of physical parameters in the inner regions of active-galactic-nucleus jets and complement results on multiw…
The major upgrade of the MAGIC telescopes, Part I: The hardware improvements and the commissioning of the system
MAGIC Collaboration, J. Aleksic, S. Ansoldi +162
The MAGIC telescopes are two Imaging Atmospheric Cherenkov Telescopes (IACTs) located on the Canary island of La Palma. The telescopes are designed to measure Cherenkov light from…
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…
Search for Gamma-ray Spectral Lines from Dark Matter Annihilation up to 100 TeV towards the Galactic Center with MAGIC
MAGIC Collaboration, H. Abe, S. Abe +210
Line-like features in TeV -rays constitute a ''smoking gun'' for TeV-scale particle dark matter and new physics. Probing the Galactic Center region with ground-based Cherenkov…
Observations of the magnetars 4U 0142+61 and 1E 2259+586 with the MAGIC telescopes
The MAGIC Collaboration, J. AleksiÄ, L. A. Antonelli +153
Magnetars are an extreme, highly magnetized class of isolated neutron stars whose large X-ray luminosity is believed to be driven by their high magnetic field. In this work we stud…
High zenith angle observations of PKS 2155-304 with the MAGIC-I telescope
The MAGIC Collaboration, J. AleksiÄ, L. A. Antonelli +153
The high frequency peaked BL Lac PKS 2155-304 with a redshift of z=0.116 was discovered in 1997 in the very high energy (VHE, E >100GeV) gamma-ray range by the University of Durham…
Teraelectronvolt pulsed emission from the Crab pulsar detected by MAGIC
MAGIC Collaboration, S. Ansoldi, L. A. Antonelli +139
Aims: To investigate the extension of the very-high-energy spectral tail of the Crab pulsar at energies above 400 GeV. Methods: We analyzed 320 hours of good quality data of…
GRB 221009A: the B.O.A.T Burst that Shines in Gamma Rays
M. Axelsson, M. Ajello, M. Arimoto +151
We present a complete analysis of Fermi Large Area Telescope (LAT) data of GRB 221009A, the brightest Gamma-Ray Burst (GRB) ever detected. The burst emission above 30 MeV detected…
The spectrum of isotropic diffuse gamma-ray emission between 100 MeV and 820 GeV
The Fermi LAT collaboration, M. Ackermann, M. Ajello +142
The γ-ray sky can be decomposed into individually detected sources, diffuse emission attributed to the interactions of Galactic cosmic rays with gas and radiation fields, and a re…
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…
The January 2010 flare of Mrk421: Insights from a stochastic acceleration model
MAGIC collaboration, K. Abe, S. Abe +191
Mrk421 displayed its highest flux state ever observed in February of 2010 with very high TeV fluxes and interesting cross-band correlations and a spectral energy distribution (SED)…
GRB 221009A: Observations with LST-1 of CTAO and Implications for Structured Jets in Long Gamma-Ray Bursts
LST Collaboration, K. Abe, S. Abe +328
GRB 221009A is the brightest gamma-ray burst (GRB) observed to date. Extensive observations of its afterglow emission across the electromagnetic spectrum were performed, providing…
Very-high-energy gamma-ray detection and long-term multi-wavelength view of the flaring blazar B2 1811+31
K. Abe, S. Abe, J. Abhir +231
Among the blazars whose emission has been detected up to very-high-energy (VHE; 100 GeV < E < 100 TeV) gamma rays, intermediate synchrotron-peaked BL Lacs (IBLs) are quite rare. Th…
Performance of the joint LST-1 and MAGIC observations evaluated with Crab Nebula data
H. Abe, K. Abe, S. Abe +365
Aims. LST-1, the prototype of the Large-Sized Telescope for the upcoming Cherenkov Telescope Array Observatory, is concluding its commissioning in Observatorio del Roque de los Muc…
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 upper limits on the GRB 090102 afterglow
MAGIC Collaboration, J. AleksiÄ, S. Ansoldi +160
Indications of a GeV component in the emission from GRBs are known since the EGRET observations during the 1990's and they have been confirmed by the data of the Fermi satellite. T…
A method to measure the mirror reflectivity of a prime focus telescope
R. Mirzoyan, M. Garczarczyk, J. Hose +1
We have developed a method to measure the mirror reflectivity of telescopes. While it is relatively easy to measure the local reflectivity of the mirror material, it is not so stra…
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…
Constraints on the VHE counterpart of two binary black hole mergers observed by the MAGIC and CTAO LST-1 telescopes
K. Abe, S. Abe, J. Abhir +439
We present very-high-energy gamma-ray observations of two binary black hole merger candidates, GW240615_113620 and GW241125_010116, performed with the Major Atmospheric Gamma Imagi…
Binary Millisecond Pulsar Discovery via Gamma-Ray Pulsations
H. J. Pletsch, L. Guillemot, H. Fehrmann +150
Millisecond pulsars, old neutron stars spun-up by accreting matter from a companion star, can reach high rotation rates of hundreds of revolutions per second. Until now, all such "…
Low-Energy Astrophysics: Stimulating the Reduction of Energy Consumption in the Next Decade
P. J. Marshall, N. Bennert, E. S. Rykoff +27
In this paper we address the consumption of energy by astronomers while performing their professional duties. Although we find that astronomy uses a negligible fraction of the US e…
Multi-Wavelength Observations of the Blazar 1ES 1011+496 in Spring 2008
The MAGIC Collaboration, M. L. Ahnen, S. Ansoldi +158
The BL Lac object 1ES 1011+496 was discovered at Very High Energy gamma-rays by MAGIC in spring 2007. Before that the source was little studied in different wavelengths. Therefore…
Flux upper limit of gamma-ray emission by GRB050713a from MAGIC Telescope observations
J. Albert, E. Aliu, H. Anderhub +127
The long-duration GRB050713a was observed by the MAGIC Telescope, 40 seconds after the burst onset, and followed up for 37 minutes, until twilight. The observation, triggered by a…
The Discovery of gamma-Ray Emission From The Blazar RGB J0710+591
V. A. Acciari, E. Aliu, T. Arlen +234
The high-frequency-peaked BL Lacertae object RGB J0710+591 was observed in the very high-energy (VHE; E > 100 GeV) wave band by the VERITAS array of atmospheric Cherenkov telescope…
Black hole lightning due to particle acceleration at subhorizon scales
MAGIC Collaboration, J. AleksiÄ, S. Ansoldi +151
Supermassive black holes with masses of millions to billions of solar masses are commonly found in the centers of galaxies. Astronomers seek to image jet formation using radio inte…
Periodic Gamma-ray Modulation of the blazar PG 1553+113 Confirmed by Fermi-LAT and Multi-wavelength Observations
S. Abdollahi, L. Baldini, G. Barbiellini +98
A 2.1-year periodic oscillation of the gamma-ray flux from the blazar PG 1553+113 has previously been tentatively identified in almost 7 year of data from the Fermi Large Area Tele…
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…
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…
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…
TeV pion bumps in the gamma-ray spectra of flaring blazars
M. Petropoulou, A. Mastichiadis, G. Vasilopoulos +3
(Abridged) Very high-energy (VHE, GeV) observations of the blazar Mrk 501 with MAGIC in 2014 provided evidence for an unusual narrow spectral feature at about 3 TeV during…
Discovery of VHE gamma-rays from the blazar 1ES 1215+303 with the MAGIC Telescopes and simultaneous multi-wavelength observations
MAGIC Collaboration, J. AleksiÄ, E. A. Alvarez +164
Context. We present the discovery of very high energy (VHE, E > 100GeV) gamma-ray emission from the BL Lac object 1ES 1215+303 by the MAGIC telescopes and simultaneous multi-wavele…
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…