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

Detection of the Crab Nebula with the 9.7 m Prototype Schwarzschild-Couder Telescope

The Schwarzschild-Couder Telescope (SCT) is a telescope concept proposed for the Cherenkov Telescope Array. It employs a dual-mirror optical design to remove comatic aberrations over an $8^{\circ}$ field of view, and a high-density silicon…

Instrumentation and Methods for Astrophysics · Physics 2021-02-17 C. B. Adams , R. Alfaro , G. Ambrosi , M. Ambrosio , C. Aramo , T. Arlen , P. I. Batista , W. Benbow , B. Bertucci , E. Bissaldi , J. Biteau , M. Bitossi , A. Boiano , C. Bonavolontà , R. Bose , A. Bouvier , A. Brill , A. M. Brown , J. H. Buckley , K. Byrum , R. A. Cameron , R. Canestrari , M. Capasso , M. Caprai , C. E. Covault , D. Depaoli , M. Errando , S. Fegan , Q. Feng , E. Fiandrini , G. Foote , P. Fortin , S. Funk , A. Furniss , F. Garfias , A. Gent , N. Giglietto , F. Giordano , E. Giro , M. M. González , V. Guarino , R. Halliday , O. Hervet , J. Holder , G. Hughes , T. B. Humensky , M. Ionica , A. Iriarte , W. Jin , C. A. Johnson , P. Kaaret , D. Kieda , B. Kim , A. Kuznetsov , J. S. Lapington , F. Licciulli , S. Loporchio , V. Mason , K. Meagher , T. Meures , B. A. W. Mode , S. A. I. Mognet , R. Mukherjee , T. Nguyen , D. Nieto , A. Okumura , N. Otte , N. La Palombara , F. R. Pantaleo , R. Paoletti , G. Pareschi , A. Petrashyk , F. Di Pierro , E. Pueschel , P. T. Reynolds , D. Ribeiro , G. Richards , E. Roache , D. Ross , J. Rousselle , A. Rugliancich , J. Ruíz-Díaz-Soto , M. Santander , S. Schlenstedt , M. Schneider , S. Scuderi , R. Shang , G. Sironi , B. Stevenson , L. Stiaccini , H. Tajima , L. P. Taylor , J. Thornhill , L. Tosti , G. Tovmassian , V. Vagelli , M. Valentino , J. Vandenbroucke , V. V. Vassiliev , L. Di Venere , S. P. Wakely , J. J. Watson , R. White , P. Wilcox , D. A. Williams , M. Wood , P. Yu , A. Zink

Monte Carlo comparison of mid-size telescope designs for the Cherenkov Telescope Array

The Cherenkov Telescope Array (CTA) is a future very high energy gamma-ray observatory. CTA will be comprised of small-, medium- and large-size telescopes covering an energy range from tens of GeV to hundreds of TeV and will surpass…

Instrumentation and Methods for Astrophysics · Physics 2019-08-14 T. Jogler , M. D. Wood , J. Dumm

An analysis method for data taken by Imaging Air Cherenkov Telescopes at very high energies under the presence of clouds

The effective observation time of Imaging Air Cherenkov Telescopes (IACTs) plays an important role in the detection of gamma-ray sources, especially when the expected flux is low. This time is strongly limited by the atmospheric conditions.…

Instrumentation and Methods for Astrophysics · Physics 2020-09-29 Dorota Sobczyńska , Katarzyna Adamczyk , Julian Sitarek , Michal Szanecki

VHE Spectral Properties of Mrk 501 with the CAT telescope

We report here observations of the active galactic nucleus Mrk 501, at energies above 250 GeV carried out with the CAT atmospheric imaging telescope from March 1997 to Autumn 1998. This source was in a high state of activity at several…

Astrophysics · Physics 2019-08-14 J. -P. Tavernet

Observation of the Crab Nebula with the MAGIC telescope

We report about very high energy (VHE) gamma-ray observations of the Crab Nebula with the MAGIC telescope. The gamma-ray flux from the nebula was measured between 60 GeV and 9 TeV. The energy spectrum can be described with a curved power…

Astrophysics · Physics 2019-08-13 A. Nepomuk Otte

Discovery of Very High Energy Gamma Rays from 1ES 1440+122

The BL Lacertae object 1ES 1440+122 was observed in the energy range from 85 GeV to 30 TeV by the VERITAS array of imaging atmospheric Cherenkov telescopes. The observations, taken between 2008 May and 2010 June and totalling 53 hours,…

High Energy Astrophysical Phenomena · Physics 2016-08-10 VERITAS Collaboration , S. Archambault , A. Archer , A. Barnacka , B. Behera , M. Beilicke , W. Benbow , K. Berger , R. Bird , M. Boettcher , J. H. Buckley , V. Bugaev , J. V Cardenzana , M. Cerruti , X. Chen , J. L. Christiansen , L. Ciupik , E. Collins-Hughes , M. P. Connolly , W. Cui , H. J. Dickinson , J. Dumm , J. D. Eisch , M. Errando , A. Falcone , S. Federici , Q. Feng , J. P. Finley , H. Fleischhack , L. Fortson , A. Furniss , G. H. Gillanders , S. Godambe , S. Griffin , S. T. Griffiths , J. Grube , G. Gyuk , N. Haakansson , D. Hanna , J. Holder , G. Hughes , C. A. Johnson , P. Kaaret , P. Kar , M. Kertzman , Y. Khassen , D. Kieda , H. Krawczynski , S. Kumar , M. J. Lang , A. S Madhavan , G. Maier , S. McArthur , A. McCann , K. Meagher , J. Millis , P. Moriarty , T. Nelson , D. Nieto , A. O'Faolain de Bhroithe , R. A. Ong , A. N. Otte , N. Park , J. S. Perkins , M. Pohl , A. Popkow , H. Prokoph , E. Pueschel , J. Quinn , K. Ragan , J. Rajotte , L. C. Reyes , P. T. Reynolds , G. T. Richards , E. Roache , G. H. Sembroski , K. Shahinyan , A. W. Smith , D. Staszak , K Sweeney , I. Telezhinsky , J. V. Tucci , J. Tyler , A. Varlotta , V. V. Vassiliev , S. P. Wakely , R. Welsing , A. Wilhelm , D. A. Williams , B. Zitzer

The major upgrade of the MAGIC telescopes, Part II: A performance study using observations of the Crab Nebula

MAGIC is a system of two Imaging Atmospheric Cherenkov Telescopes located in the Canary island of La Palma, Spain. During summer 2011 and 2012 it underwent a series of upgrades, involving the exchange of the MAGIC-I camera and its trigger…

Instrumentation and Methods for Astrophysics · Physics 2015-02-23 MAGIC Collaboration , J. Aleksic , S. Ansoldi , L. A. Antonelli , P. Antoranz , A. Babic , P. Bangale , M. Barcelo , J. A. Barrio , J. Becerra Gonzalez , W. Bednarek , E. Bernardini , B. Biasuzzi , A. Biland , M. Bitossi , O. Blanch , S. Bonnefoy , G. Bonnoli , F. Borracci , T. Bretz , E. Carmona , A. Carosi , R. Cecchi , P. Colin , E. Colombo , J. L. Contreras , D. Corti , J. Cortina , S. Covino , P. Da Vela , F. Dazzi , A. De Angelis , G. De Caneva , B. De Lotto , E. de Ona Wilhelmi , C. Delgado Mendez , A. Dettlaff , D. Dominis Prester , D. Dorner , M. Doro , S. Einecke , D. Eisenacher , D. Elsaesser , D. Fidalgo , D. Fink , M. V. Fonseca , L. Font , K. Frantzen , C. Fruck , D. Galindo , R. J. Garcia Lopez , M. Garczarczyk , D. Garrido Terrats , M. Gaug , G. Giavitto , N. Godinovic , A. Gonzalez Munoz , S. R. Gozzini , W. Haberer , D. Hadasch , Y. Hanabata , M. Hayashida , J. Herrera , D. Hildebrand , J. Hose , D. Hrupec , W. Idec , J. M. Illa , V. Kadenius , H. Kellermann , M. L. Knoetig , K. Kodani , Y. Konno , J. Krause , H. Kubo , J. Kushida , A. La Barbera , D. Lelas , J. L. Lemus , N. Lewandowska , E. Lindfors , S. Lombardi , F. Longo , M. Lopez , R. Lopez-Coto , A. Lopez-Oramas , A. Lorca , E. Lorenz , I. Lozano , M. Makariev , K. Mallot , G. Maneva , N. Mankuzhiyil , K. Mannheim , L. Maraschi , B. Marcote , M. Mariotti , M. Martinez , D. Mazin , U. Menzel , J. M. Miranda , R. Mirzoyan , A. Moralejo , P. Munar-Adrover , D. Nakajima , M. Negrello , V. Neustroev , A. Niedzwiecki , K. Nilsson , K. Nishijima , K. Noda , R. Orito , A. Overkemping , S. Paiano , M. Palatiello , D. Paneque , R. Paoletti , J. M. Paredes , X. Paredes-Fortuny , M. Persic , J. Poutanen , P. G. Prada Moroni , E. Prandini , I. Puljak , R. Reinthal , W. Rhode , M. Ribo , J. Rico , J. Rodriguez Garcia , S. Rugamer , T. Saito , K. Saito , K. Satalecka , V. Scalzotto , V. Scapin , C. Schultz , J. Schlammer , S. Schmidl , T. Schweizer , S. N. Shore , A. Sillanpaa , J. Sitarek , I. Snidaric , D. Sobczynska , F. Spanier , A. Stamerra , T. Steinbring , J. Storz , M. Strzys , L. Takalo , H. Takami , F. Tavecchio , L. A. Tejedor , P. Temnikov , T. Terzic , D. Tescaro , M. Teshima , J. Thaele , O. Tibolla , D. F. Torres , T. Toyama , A. Treves , P. Vogler , H. Wetteskind , M. Will , R. Zanin

Searching for tau neutrinos with Cherenkov telescopes

Cherenkov telescopes have the capability of detecting high energy tau neutrinos in the energy range of 1--1000 PeV by searching for very inclined showers. If a tau lepton, produced by a tau neutrino, escapes from the Earth or a mountain, it…

Instrumentation and Methods for Astrophysics · Physics 2014-07-03 D. Gora , E. Bernardini , A. Kappes

The energy spectrum of cosmic-ray electrons at TeV energies

The very large collection area of ground-based gamma-ray telescopes gives them a substantial advantage over balloon/satellite based instruments in the detection of very-high-energy (>600 GeV) cosmic-ray electrons. Here we present the…

Astrophysics · Physics 2012-08-27 H. E. S. S. Collaboration , : , F. Aharonian

The temporal characteristics of the TeV Gamma emission from Mkn 501 in 1997 - Part II: Results from HEGRA CT1 and CT2

We present the results on the TeV gamma emission from Mkn 501 in 1997 obtained with the standalone Cherenkov telescopes CT1 and CT2 (threshold > 1.2 and > 1.0 resp.) of the HEGRA collaboration. The CT1 lightcurve has the most complete…

Astrophysics · Physics 2007-05-23 F. Aharonian

A new analysis method for very high definition Imaging Atmospheric Cherenkov Telescopes as applied to the CAT telescope

A new method of shower-image analysis is presented which appears very powerful as applied to those Cherenkov Imaging Telescopes with very high definition imaging capability. It provides hadron rejection on the basis of a single cut on the…

Astrophysics · Physics 2009-10-30 S. Le Bohec , B. Degrange , M. Punch , A. Barrau , R. Bazer-Bachi , H. Cabot , L. M Chounet , G. Debiais , 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 , I. Malet , C. Meynadier , F. Munz , T. A. Palfrey , E. Pare , Y. Pons , J. Quebert , K. Ragan , C. renault , M. Rivoal , L. Rob , P. Schovaneck , D. Smith , J. P. Tavernet , J. Vrana

Performance of the HAWC Observatory and TeV Gamma-Ray Measurements of the Crab Nebula with Improved Extensive Air Shower Reconstruction Algorithms

The High-Altitude Water Cherenkov (HAWC) Gamma-Ray Observatory located on the side of the Sierra Negra volcano in Mexico, has been fully operational since 2015. The HAWC collaboration has recently significantly improved their…

High Energy Astrophysical Phenomena · Physics 2024-07-02 A . Albert , R. Alfaro , C. Alvarez , A . Andrés , J. C. Arteaga-Velázquez , D. Avila Rojas , H. A. Ayala Solares , R. Babu , E. Belmont-Moreno , K. S. Caballero-Mora , T. Capistrán , A. Carramiñana , S. Casanova , U. Cotti , J. Cotzomi , S. Coutiño de León , E. De la Fuente , C. de León , D. Depaoli , N. Di Lalla , R. Diaz Hernandez , B. L . Dingus , M. A. DuVernois , K. Engel , T. Ergin , C . Espinoza , K. L. Fan , K. Fang , N. Fraija , S. Fraija , J. A. García-González , F. Garfias , H . Goksu , M. M. González , J. A. Goodman , S. Groetsch , J. P. Harding , S. Hernández-Cadena , I. Herzog , J . Hinton , D. Huang , F. Hueyotl-Zahuantitla , P. Hüntemeyer , A. Iriarte , S. Kaufmann , A . Lara , J. Lee , H. León Vargas , J. T . Linnemann , A. L. Longinotti , G. Luis-Raya , K. Malone , J. Martínez-Castro , J. A. Matthews , P. Miranda-Romagnoli , J. A. Montes , E. Moreno , M. Mostafá , L. Nellen , M. U . Nisa , R . Noriega-Papaqui , L . Olivera-Nieto , N. Omodei , M. Osorio , Y. Pérez Araujo , E. G. Pérez-Pérez , C. D. Rho , D. Rosa-González , E . Ruiz-Velasco , H. Salazar , D. Salazar-Gallegos , A. Sandoval , M. Schneider , G . Schwefer , J. Serna-Franco , A. J. Smith , Y. Son , R. W . Springer , O. Tibolla , K. Tollefson , I. Torres , R. Torres-Escobedo , R. Turner , F. Ureña-Mena , E . Varela , X. Wang , I. J. Watson , K. Whitaker , E. Willox , H. Wu , S . Yu , S. Yun-Cárcamo , H. Zhou

VERITAS Observations of the BL Lac Object PG 1553+113 Between May 2010 and May 2011

VERITAS, an array of imaging atmospheric-Cherenkov telescopes, studies blazars in the energy range between ~100 GeV and ~30 TeV. With its excellent sensitivity at these energies, and ever-deepening source exposures, VERITAS is in a position…

Cosmology and Nongalactic Astrophysics · Physics 2019-08-13 Matthew Orr

The TeV spectrum of Mkn 501 as measured during the high state in 1997 by the HEGRA stereoscopic system of imaging air Cherenkov telescopes

The BL Lac object Mkn 501 has shown very high emission in TeV gamma-rays from March to October, 1997. During this period the source was continuously monitored with the HEGRA stereoscopic system of 4 imaging air Cherenkov telescopes for a…

Astrophysics · Physics 2019-08-14 A. Konopelko

Optical spectroscopy of blazars for the Cherenkov Telescope Array -- III

Due to their almost featureless optical/UV spectra, it is challenging to measure the redshifts of BL Lacs. As a result, about 50% of gamma-ray BL Lacs lack a firm measurement of this property, which is fundamental for population studies,…

High Energy Astrophysical Phenomena · Physics 2024-01-17 F. D'Ammando , P. Goldoni , W. Max-Moerbeck , J. Becerra Gonzalez , E. Kasai , D. A. Williams , N. Alvarez-Crespo , M. Backes , U. Barres de Almeida , C. Boisson , G. Cotter , V. Fallah Ramazani , O. Hervet , E. Lindfors , D. Mukhi-Nilo , S. Pita , M. Splettstoesser , B. van Soelen

Discovery of very-high-energy emission from RGB J2243+203 and derivation of its redshift upper limit

Very-high-energy (VHE; $>$ 100 GeV) gamma-ray emission from the blazar RGB J2243+203 was discovered with the VERITAS Cherenkov telescope array, during the period between 21 and 24 December 2014. The VERITAS energy spectrum from this source…

High Energy Astrophysical Phenomena · Physics 2017-11-15 A. U. Abeysekara , S. Archambault , A. Archer , W. Benbow , R. Bird , R. Brose , M. Buchovecky , J. H. Buckley , V. Bugaev , M. Cerruti , M. P. Connolly , W. Cui , A. Falcone , Q. Feng , J. P. Finley , H. Fleischhack , L. Fortson , A. Furniss , G. H. Gillanders , S. Griffin , J. Grube , M. Hutten , D. Hanna , O. Hervet , J. Holder , T. B. Humensky , C. A. Johnson , P. Kaaret , P. Kar , N. Kelley-Hoskins , M. Kertzman , D. Kieda , M. Krause , F. Krennrich , S. Kumar , M. J. Lang , G. Maier , S. McArthur , P. Moriarty , R. Mukherjee , D. Nieto , S. OBrien , R. A. Ong , A. N. Otte , N. Park , A. Petrashyk , M. Poh , A. Popkow , E. Puesche , J. Quinn , K. Ragan , P. T. Reynolds , G. T. Richards , E. Roache , C. Rulten , I. Sadeh , M. Santander , G. H. Sembroski , K. Shahinyan , D. Staszak , I. Telezhinsky , J. Tyler , V. V. Vassiliev , S. P. Wakely , O. M. Weiner , A. Weinstein , P. Wilcox , A. Wilhelm , D. A. Williams , B. Zitzer

Investigating the peculiar emission from the new VHE gamma-ray source H1722+119

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, for a total of 12.5 h. The observations were triggered by…

High Energy Astrophysical Phenomena · Physics 2016-10-03 MAGIC Collaboration , M. L. Ahnen , S. Ansoldi , L. A. Antonelli , P. Antoranz , A. Babic , B. Banerjee , P. Bangale , U. Barres de Almeida , J. A. Barrio , J. Becerra González , W. Bednarek , E. Bernardini , B. Biasuzzi , A. Biland , O. Blanch , S. Bonnefoy , G. Bonnoli , F. Borracci , T. Bretz , S. Buson , A. Carosi , A. Chatterjee , R. Clavero , P. Colin , E. Colombo , J. L. Contreras , J. Cortina , S. Covino , P. Da Vela , F. Dazzi , A. De Angelis , B. De Lotto , E. de Ona Wilhelmi , F. Di Pierro , M. Doert , A. Domínguez , D. Dominis Prester , D. Dorner , M. Doro , S. Einecke , D. Eisenacher Glawion , D. Elsaesser , V. Fallah Ramazani , A. Fernández-Barral , D. Fidalgo , M. V. Fonseca , L. Font , K. Frantzen , C. Fruck , D. Galindo , R. J. García López , M. Garczarczyk , D. Garrido Terrats , M. Gaug , P. Giammaria , N. Godinović , A. González Munoz , D. Gora , D. Guberman , D. Hadasch , A. Hahn , Y. Hanabata , M. Hayashida , J. Herrera , J. Hose , D. Hrupec , G. Hughes , W. Idec , K. Kodani , Y. Konno , H. Kubo , J. Kushida , A. La Barbera , D. Lelas , E. Lindfors , S. Lombardi , F. Longo , M. López , R. López-Coto , P. Majumdar , M. Makariev , K. Mallot , G. Maneva , M. Manganaro , K. Mannheim , L. Maraschi , B. Marcote , M. Mariotti , M. Martínez , D. Mazin , U. Menzel , J. M. Miranda , R. Mirzoyan , A. Moralejo , E. Moretti , D. Nakajima , V. Neustroev , A. Niedzwiecki , M. Nievas Rosillo , K. Nilsson , K. Nishijima , K. Noda , L. Nogués , R. Orito , A. Overkemping , S. Paiano , J. Palacio , M. Palatiello , D. Paneque , R. Paoletti , J. M. Paredes , X. Paredes-Fortuny , G. Pedaletti , L. Perri , M. Persic , J. Poutanen , P. G. Prada Moroni , E. Prandini , I. Puljak , W. Rhode , M. Ribó , J. Rico , J. Rodriguez Garcia , T. Saito , K. Satalecka , C. Schultz , T. Schweizer , A. Sillanpää , J. Sitarek , I. Snidaric , D. Sobczynska , A. Stamerra , T. Steinbring , M. Strzys , L. Takalo , H. Takami , F. Tavecchio , P. Temnikov , T. Terzić , D. Tescaro , M. Teshima , J. Thaele , D. F. Torres , T. Toyama , A. Treves , V. Verguilov , I. Vovk , J. E. Ward , M. Will , M. H. Wu , R. Zanin , F. D'Ammando , A. Berdyugin , T. Hovatta , W. Max-Moerbeck , C. M. Raiteri , A. C. S. Readhead , R. Reinthal , J. L. Richards , F. Verrecchia , M. Villata

The implications from CANGAROO-III observations of TeV blazar PKS 2155-304

We have observed the high-frequency-peaked BL Lacertae object PKS2155-304 in 2004, 2005 and 2006 with the CANGAROO-III imaging atmospheric Cherenkov telescope, and have detected a signal above 660 GeV at the 4.8/sigma level during the 2006…

Astrophysics · Physics 2009-11-13 K. Nishijima , Y. Sakamoto , J. Kushida , K. Saito

Optical Spectroscopy of Blazars for the Cherenkov Telescope Array -- II

Active galactic nuclei (AGNs) make up about 35 per cent of the more than 250 sources detected in very-high-energy (VHE) gamma rays to date with Imaging Atmospheric Cherenkov Telescopes. Apart from four nearby radio galaxies and two AGNs of…

High Energy Astrophysical Phenomena · Physics 2022-11-16 E. Kasai , P. Goldoni , S. Pita , D. A. Williams , W. Max-Moerbeck , O. Hervet , G. Cotter , M. Backes , C. Boisson , J. Becerra González , U. Barres de Almeida , F. D'Ammando , V. Fallah Ramazani , E. Lindfors

Monte Carlo comparison of medium-size telescope designs for the Cherenkov Telescope Array

The Cherenkov Telescope Array (CTA) is a future very high energy gamma-ray observatory. CTA will be comprised of small-,medium- and large-size telescopes covering an energy range from tens of GeV to hundreds of TeV and will surpass existing…

Instrumentation and Methods for Astrophysics · Physics 2019-08-14 T. Jogler , M. D. Wood , J. Dumm , A. Bouvier