Related papers: Large zenith-angle observations with the CAT Chere…

Effectiveness of TeV Gamma-Ray Observations at Large Zenith Angles with a Stereoscopic System of Imaging Atmospheric Cherenkov Telescopes

The sensitivity of imaging atmospheric Cherenkov telescopes (IACTs) in TeV gamma-ray observations reachs its maximum at small zenith angles (< 30 degree) which provide the minimum attainable energy threshold of an instrument. However, for a…

Astrophysics · Physics 2008-11-26 A. Konopelko , F. Aharonian , M. Hemberger , W. Hofmann , J. Kettler , G. Puehlhofer , H. J. Voelk

Observation of the Crab Nebula Gamma-Ray Emission Above 220 Gev by the Cat Cherenkov Imaging Telescope

The CAT imaging telescope, recently built on the site of the former solar plant Themis (French Pyrenees), observed gamma-rays from the Crab nebula from October 1996 to March 1997. This steady source, often considered as the standard candle…

Astrophysics · Physics 2007-05-23 A. Barrau , R. Bazer-Bachi , H. Cabot , L. M. Chounet , G. Debiais , B. Degrange , J. P. Dezalay , A. Djannati-Atai , D. Dumora , P. Espigat , B. Fabre , P. Fleury , G. Fontaine , R. George , C. Ghesquiere , P. Goret , C. Gouiffes , I. A. Grenier , L. Iacoucci , S. Le Bohec , I. Mallet , C. Meynadier , F. Munz , T. A. Palfrey , E. Pare , Y. Pons , M. Punch , J. Quebert , K. Ragan , C. Renault , M. Rivoal , L. Rob , P. Schovanek , D. Smith , J. P. Tavernet , J. Vrana

Performance of the Large-Sized Telescope prototype of the Cherenkov Telescope Array

The next-generation ground-based gamma-ray Cherenkov Telescope Array Observatory (CTAO) will consist of imaging atmospheric Cherenkov telescopes (IACTs) of three different sizes distributed in two sites. The Large-Sized Telescopes will…

High Energy Astrophysical Phenomena · Physics 2023-09-21 Daniel Morcuende , Rubén López-Coto , Abelardo Moralejo , Seiya Nozaki , Thomas Vuillaume

MAGIC very large zenith angle observations of the Crab Nebula up to 100 TeV

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 high energies. Methods: We use the novel very large zenith…

High Energy Astrophysical Phenomena · Physics 2020-04-01 MAGIC Collaboration , V. A. Acciari , S. Ansoldi , L. A. Antonelli , A. Arbet Engels , D. Baack , A. Babić , B. Banerjee , U. Barres de Almeida , J. A. Barrio , J. Becerra González , W. Bednarek , L. Bellizzi , E. Bernardini , A. Berti , J. Besenrieder , W. Bhattacharyya , C. Bigongiari , A. Biland , O. Blanch , G. Bonnoli , Ž. Bošnjak , G. Busetto , R. Carosi , G. Ceribella , Y. Chai , A. Chilingaryan , S. Cikota , S. M. Colak , U. Colin , E. Colombo , J. L. Contreras , J. Cortina , S. Covino , V. D'Elia , P. Da Vela , F. Dazzi , A. De Angelis , B. De Lotto , M. Delfino , J. Delgado , D. Depaoli , F. Di Pierro , L. Di Venere , E. Do Souto Espiñeira , D. Dominis Prester , A. Donini , D. Dorner , M. Doro , D. Elsaesser , V. Fallah Ramazani , A. Fattorini , G. Ferrara , D. Fidalgo , L. Foffano , M. V. Fonseca , L. Font , C. Fruck , S. Fukami , R. J. García López , M. Garczarczyk , S. Gasparyan , M. Gaug , N. Giglietto , F. Giordano , N. Godinović , D. Green , D. Guberman , D. Hadasch , A. Hahn , J. Herrera , J. Hoang , D. Hrupec , M. Hütten , T. Inada , S. Inoue , K. Ishio , Y. Iwamura , L. Jouvin , D. Kerszberg , H. Kubo , J. Kushida , A. Lamastra , D. Lelas , F. Leone , E. Lindfors , S. Lombardi , F. Longo , M. López , R. López-Coto , A. López-Oramas , S. Loporchio , B. Machado de Oliveira Fraga , C. Maggio , P. Majumdar , M. Makariev , M. Mallamaci , G. Maneva , M. Manganaro , K. Mannheim , L. Maraschi , M. Mariotti , M. Martínez , D. Mazin , S. Mićanović , D. Miceli , M. Minev , J. M. Miranda , R. Mirzoyan , E. Molina , A. Moralejo , D. Morcuende , V. Moreno , E. Moretti , P. Munar-Adrover , V. Neustroev , C. Nigro , K. Nilsson , D. Ninci , K. Nishijima , K. Noda , L. Nogués , S. Nozaki , S. Paiano , J. Palacio , M. Palatiello , D. Paneque , R. Paoletti , J. M. Paredes , P. Peñil , M. Peresano , M. Persic , P. G. Prada Moroni , E. Prandini , I. Puljak , W. Rhode , M. Ribó , J. Rico , C. Righi , A. Rugliancich , L. Saha , N. Sahakyan , T. Saito , S. Sakurai , K. Satalecka , K. Schmidt , T. Schweizer , J. Sitarek , I. Šnidarić , D. Sobczynska , A. Somero , A. Stamerra , D. Strom , M. Strzys , Y. Suda , T. Surić , M. Takahashi , F. Tavecchio , P. Temnikov , T. Terzić , M. Teshima , N. Torres-Albà , L. Tosti , V. Vagelli , J. van Scherpenberg , G. Vanzo , M. Vazquez Acosta , C. F. Vigorito , V. Vitale , I. Vovk , M. Will , D. Zarić

Performances of the CAT imaging telescope and some preliminary results on Mkn 180 and the Crab

The CAT imaging telesope, which uses the Atmospheric Cherenkov Technique to observe TeV gamma-ray sources, has been operating since September 1996. Located in southern France, it features a fine grained camera consisting of 546 PMT with a…

Astrophysics · Physics 2007-05-23 A. Barrau , R. Bazer-Bachi , H. Cabot , L. M. Chounet , G. Debiais , B. Degrange , J. P. Dezalay , A. Djannati-Atai , D. Dumora , P. Espigat , B. Fabre , P. Fleury , G. Fontaine , R. George , C. Ghesquiere , P. Goret , C. Gouiffes , I. A. Grenier , L. Iacoucci , S. Le Bohec , I. Malet , C. Meynadier , P. Munz , T. A. Palfrey , E. Pare , Y. Pons , M. Punch , J. Quebert , K. Ragan , C. Renault , M. Rivoal , L. Rob , P. Schovanek , D. Smith , J. P. Tavernet , J. Vrana

Observations of the Crab Nebula with MACE (Major Atmospheric Cherenkov Experiment)

The Major Atmospheric Cherenkov Experiment (MACE) is a large size (21m) Imaging Atmospheric Cherenkov Telescope (IACT) installed at an altitude of 4270m above sea level at Hanle, Ladakh in northern India. Here we report the detection of…

High Energy Astrophysical Phenomena · Physics 2024-04-03 Borwankar C. , Sharma M. , Hariharan J. , Venugopal K. , Godambe S. , Mankuzhyil N. , Chandra P. , Khurana M. , Pathania A. , Chouhan N. , Dhar V. K. , Thubstan R. , Norlha S. , Keshavananda , Sarkar D. , Dar Z. A. , Kotwal S. V. , Godiyal S. , Kushwaha C. P. , Singh K. K. , Das M. P. , Tolamatti A. , Ghosal B. , Chanchalani K. , Pandey P. , Bhatt N. , Bhattcharyya S. , Sahayanathan S. , Koul M. K. , Dorjey P. , Dorji N. , Chitnis V. R. , Tickoo A. K. , Rannot R. C. , Yadav K. K

The CAT Imaging Telescope for Very-High-Energy Gamma-Ray Astronomy

The CAT (Cherenkov Array at Themis) imaging telescope, equipped with a very-high-definition camera (546 fast phototubes with 0.12 degrees spacing surrounded by 54 larger tubes in two guard rings) started operation in Autumn 1996 on the site…

Astrophysics · Physics 2009-10-30 A. Barrau , R. Bazer-Bachi , E. Beyer , H. Cabot , M. Cerutti , L. M. Chounet , G. Debiais , B. Degrange , H. Delchini , J. P. Denance , G. Descotes , J. P. Dezalay , A. Djannati-Atai , D. Dumora , P. Espigat , B. Fabre , P. Fleury , G. Fontaine , R. George , C. Ghesquiere , J. Gilly , P. Goret , C. Gouiffes , J. C. Gouillaud , C. Gregory , I. A. Grenier , L. Iacoucci , L. Kalt , S. Le Bohec , I. Malet , C. Meynadier , J. P. Mols , P. Mora de Freitas , R. Morano , G. Morinaud , F. Munz , M. Palatka , T. A. Palfrey , E. Pare , Y. Pons , M. Punch , J. Quebert , K. Ragan , C. Renault , M. Rivoal , L. Rob , P. Schovanek , D. Smith , A. Tabary , J. P. Tavernet , F. Toussenel , J. Vrana

The Crab Nebula Spectrum at ~100 TeV Measured with MAGIC under Very Large Zenith Angles

The Crab Nebula was discovered as the first very-high-energy gamma-ray source by the Whipple Observatory in 1989. Thirty years after its discovery it is still the reference source and the standard candle for Imaging Atmospheric Cherenkov…

Instrumentation and Methods for Astrophysics · Physics 2019-09-13 Michele Peresano , Razmik Mirzoyan , Ievgen Vovk , Petar Temnikov , Darko Zarić , Nikola Godinović , Juliane van Scherpenberg , Jüergen Besenrieder

High zenith angle observations of PKS 2155-304 with the MAGIC-I telescope

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 Mark VI gamma-ray Cherenkov telescope in Australia with a…

High Energy Astrophysical Phenomena · Physics 2015-06-05 The MAGIC Collaboration , J. Aleksić , L. A. Antonelli , P. Antoranz , M. Asensio , U. Barres de Almeida , J. A. Barrio , J. Becerra González , W. Bednarek , K. Berger , E. Bernardini , A. Biland , O. Blanch , R. K. Bock , A. Boller , G. Bonnoli , D. Borla Tridon , T. Bretz , E. Carmona , A. Carosi , P. Colin , E. Colombo , J. L. Contreras , J. Cortina , L. Cossio , S. Covino , P. Da Vela , F. Dazzi , A. De Angelis , G. De Caneva , E. De Cea del Pozo , B. De Lotto , C. Delgado Mendez , A. Diago Ortega , M. Doert , D. Dominis Prester , D. Dorner , M. Doro , D. Eisenacher , D. Elsaesser , D. Ferenc , M. V. Fonseca , L. Font , C. Fruck , R. J. García López , M. Garczarczyk , D. Garrido Terrats , M. Gaug , G. Giavitto , N. Godinović , A. González Muñoz , S. R. Gozzini , A. Hadamek , D. Hadasch , D. Häfner , A. Herrero , J. Hose , D. Hrupec , B. Huber , F. Jankowski , T. Jogler , V. Kadenius , S. Klepser , M. L. Knoetig , T. Krähenbühl , J. Krause , J. Kushida , A. La Barbera , D. Lelas , E. Leonardo , N. Lewandowska , E. Lindfors , S. Lombardi , M. López , R. López-Coto , A. López-Oramas , E. Lorenz , M. Makariev , G. Maneva , N. Mankuzhiyil , K. Mannheim , L. Maraschi , B. Marcote , M. Mariotti , M. Martínez , D. Mazin , M. Meucci , J. M. Miranda , R. Mirzoyan , J. Moldón , A. Moralejo , P. Munar-Adrover , A. Niedzwiecki , D. Nieto , K. Nilsson , N. Nowak , R. Orito , S. Paiano , M. Palatiello , D. Paneque , R. Paoletti , J. M. Paredes , S. Partini , M. Persic , M. Pilia , J. Pochon , F. Prada , P. G. Prada Moroni , E. Prandini , I. Puljak , I. Reichardt , R. Reinthal , W. Rhode , M. Ribó , J. Rico , S. Rügamer , A. Saggion , K. Saito , T. Y. Saito , M. Salvati , K. Satalecka , V. Scalzotto , V. Scapin , C. Schultz , T. Schweizer , S. N. Shore , A. Sillanpää , J. Sitarek , I. Snidaric , D. Sobczynska , F. Spanier , S. Spiro , V. Stamatescu , A. Stamerra , B. Steinke , J. Storz , S. Sun , T. Surić , L. Takalo , H. Takami , F. Tavecchio , P. Temnikov , T. Terzić , D. Tescaro , M. Teshima , O. Tibolla , D. F. Torres , T. Toyama , A. Treves , M. Uellenbeck , P. Vogler , R. M. Wagner , Q. Weitzel , V. Zabalza , F. Zandanel , R. Zanin

The Energy Spectrum of TeV Gamma-Rays from the Crab Nebula as measured by the HEGRA system of imaging air Cherenkov telescopes

The Crab Nebula has been observed by the HEGRA (High-Energy Gamma-Ray Astronomy) stereoscopic system of imaging air Cherenkov telescopes (IACTs) for a total of about 200 hrs during two observational campaigns: from September 1997 to March…

Astrophysics · Physics 2009-10-31 F. Aharonian , The HEGRA Collaboration

Measurement of the Crab Flux Above 60 GeV with the CELESTE Cherenkov Telescope

We have converted the former solar electrical plant THEMIS (French Pyrenees) into an atmospheric Cherenkov detector called CELESTE, which records gamma rays above 30 GeV (7E24 Hz). Here we present the first sub-100 GeV detection by a ground…

Astrophysics · Physics 2014-10-13 M. De Naurois , J. Holder , R. Bazer-Bachi , H. Bergeret , P. Bruel , A. Cordier , G. Debiais , J-P. Dezalay , D. Dumora , E. Durand , P. Eschstruth , P. Espigat , B. Fabre , P. Fleury , N. Herault , M. Hrabovsky , S. Incerti , R. Le Gallou , F. Munz , A. Musquere , J-F. Olive , E. Pare , J. Quebert , R. C. Rannot , T. Reposeur , L. Rob , P. Roy , T. Sako , P. Schovanek , D. A. Smith , P. Snabre , A. Volte

MACHETE: A transit Imaging Atmospheric Cherenkov Telescope to survey half of the Very High Energy $\gamma$-ray sky

Current Imaging Atmospheric Cherenkov Telescopes for Very High Energy $\gamma$-ray astrophysics are pointing instruments with a Field of View up to a few tens of sq deg. We propose to build an array of two non-steerable (drift) telescopes.…

Instrumentation and Methods for Astrophysics · Physics 2015-08-26 J. Cortina , R. López-Coto , A. Moralejo

The Crab nebula variability at short timescales with the Cherenkov Telescope Array

Since 2009, several rapid and bright flares have been observed at high energies (>100 MeV) from the direction of the Crab Nebula. Several hypotheses have been put forward to explain this phenomenon, but the origin is still unclear. The…

High Energy Astrophysical Phenomena · Physics 2022-10-11 Enrique Mestre , Emma de Ona Wilhelmi , Dmitry Khangulyan , Roberta Zanin , Fabio Acero , Diego F. Torres

Energy Spectrum of TeV Gamma-Rays from Crab Nebula

The Crab Nebula has been observed by the HEGRA stereoscopic system of 4 imaging air Cherenkov telescopes (IACTs) for about 100 hours from 1997 September to 1998 March. The recent detailed studies on the system performance give an energy…

Astrophysics · Physics 2019-08-14 A. Konopelko

Mrk 421, Mrk 501, and 1ES 1426+428 at 100 GeV with the CELESTE Cherenkov Telescope

We have measured the gamma-ray fluxes of the blazars Mrk 421 and Mrk 501 in the energy range between 50 and 350 GeV (1.2 to 8.3 x 10^25 Hz). The detector, called CELESTE, used first 40, then 53 heliostats of the former solar facility…

Astrophysics · Physics 2008-11-26 D. A. Smith , E. Brion , R. Britto , P. Bruel , J. Bussons Gordo , D. Dumora , E. Durand , P. Eschstruth , P. Espigat , J. Holder , A. Jacholkowska , J. Lavalle , R. Le Gallou , B. Lott , H. Manseri , F. Munz , E. Nuss , F. Piron , R. C. Rannot , T. Reposeur , T. Sako

Extending the observation limits of Imaging Air Cherenkov Telescopes toward horizon

Usually the Imaging Atmospheric Cherenkov Telescopes, used for the ground-based gamma-ray astronomy in the very high energy range 50 GeV - 50 TeV, perform air shower observations till the zenith angle of ~60 deg. Beyond that limit the…

Instrumentation and Methods for Astrophysics · Physics 2019-03-13 Razmik Mirzoyan , Ievgen Vovk , Michele Peresano , Petar Temnikov , Darko Zaric , Nikola Godinovic , Juliane van Scherpenberg , Juergen Besenrieder , Masahiro Teshima

Observation of Spectrum of TeV Gamma Rays up to 60 TeV from the Crab at the Large Zenith Angles

The CANGAROO experiment has observed gamma-ray above 7TeV from the Crab pulsar/nebula at large zenith angle in Woomera, South Australia. We report the CANGAROO data taken in 1992, 1993 and 1995, from which it appears that the energy…

Astrophysics · Physics 2019-08-17 K. Sakurazawa , T. Tanimori , S. A. Dazeley , P. G. Edwards , T. Hara , S. Kamei , T. Kifune , R. Kita , T. Konishi , A. Masaike , Y. Matsubara , Y. Matsuoka , Y. Mizumoto , M. Mori , H. Muraishi , Y. Muraki , T. Naito , K. Nishijima , S. Ogio , J. R. Patterson , M. D. Roberts , G. P. Rowell , T. Sako , R. Susukita , A. Suzuki , R. Suzuki , T. Tamura , G. J. Thornton , S. Yanagita , T. Yoshida , T. Yoshikoshi

High Energy Astrophysics

The development of the atmospheric Cherenkov imaging technique has led to significant advances in gamma-ray detection sensitivity in the energy range from 200 GeV to 50 TeV. The Whipple Observatory 10m reflector has detected the first…

Astrophysics · Physics 2007-05-23 T. C. Weekes

Observations of the Crab Nebula with H.E.S.S. Phase II

The High Energy Stereoscopic System (H.E.S.S.) phase I instrument was an array of four $100\,\mathrm{m}^2$ mirror area Imaging Atmospheric Cherenkov Telescopes (IACTs) that has very successfully mapped the sky at photon energies above $\sim…

High Energy Astrophysical Phenomena · Physics 2019-08-14 M. Holler , D. Berge , C. van Eldik , J. -P. Lenain , V. Marandon , T. Murach , M. de Naurois , R. D. Parsons , H. Prokoph , D. Zaborov

Observations of the Crab Nebula with the HEGRA system of IACTs in convergent mode using a topological trigger

Routine observations of the Crab Nebula for a total of about 250 hrs, performed with the HEGRA stereoscopic system of 5 imaging atmospheric Cerenkov telescopes in the standard operational mode, have proven the energy threshold of the system…

Astrophysics · Physics 2009-11-07 F. Lucarelli , A. Konopelko , F. Aharonian , W. Hofmann , A. Kohnle , H. Lampeitl , V. Fonseca