Related papers: Mrk 421 active state in 2008: the MAGIC view, simu…

Simultaneous multi-frequency observations of PG 1553+113

We report simultaneous multi-frequency observations of the blazar PG 1553+113, that were carried out in March-April 2008. Optical, X-ray, high-energy (HE; greater than 100 MeV) gamma-ray, and very-high- energy (VHE; greater than 100 GeV)…

High Energy Astrophysical Phenomena · Physics 2019-08-15 Nijil Mankuzhiyil , Daniela Dorner , Elisa Prandini , Massimo Persic , Elena Pian , Filippo D'Ammando , Stefano Vercellone

A Time Dependent Leptonic Model for Microquasar Jets: Application to LSI 61 303

The Galactic high-mass X-ray binary and jet source (microquasar) LSI +61 303 has recently been detected at TeV gamma-ray energies by the MAGIC telescope. We have applied a time-dependent leptonic jet model to the broadband spectral energy…

Astrophysics · Physics 2011-02-11 Swati Gupta , Markus Boettcher

VHE $\gamma$-ray discovery and multi-wavelength study of the blazar 1ES 2322-409

A hotspot at a position compatible with the BL Lac object 1ES 2322-409 was serendipitously detected with H.E.S.S. during observations performed in 2004 and 2006 on the blazar PKS 2316-423. Additional data on 1ES 2322-409 were taken in 2011…

High Energy Astrophysical Phenomena · Physics 2018-10-17 H. E. S. S. Collaboration , : , H. Abdalla , F. Aharonian , F. Ait Benkhali , E. O. Angüner , M. Arakawa , C. Arcaro , C. Armand , M. Arrieta , M. Backes , M. Barnard , Y. Becherini , J. Becker Tjus , D. Berge , S. Bernhard , K. Bernlöhr , R. Blackwell , M. Böttcher , C. Boisson , J. Bolmont , S. Bonnefoy , P. Bordas , J. Bregeon , F. Brun , P. Brun , M. Bryan , M. Büchele , T. Bulik , T. Bylund , M. Capasso , S. Caroff , A. Carosi , S. Casanova , M. Cerruti , N. Chakraborty , S. Chandra , R. C. G. Chaves , A. Chen , S. Colafrancesco , B. Condon , I. D. Davids , C. Deil , J. Devin , P. deWilt , L. Dirson , A. Djannati-Ataï , A. Dmytriiev , A. Donath , L. O'C. Drury , J. Dyks , K. Egberts , G. Emery , J. -P. Ernenwein , S. Eschbach , S. Fegan , A. Fiasson , G. Fontaine , S. Funk , M. Füßling , S. Gabici , Y. A. Gallant , T. Garrigoux , F. Gaté , G. Giavitto , D. Glawion , J. F. Glicenstein , D. Gottschall , M. -H. Grondin , J. Hahn , M. Haupt , G. Heinzelmann , G. Henri , G. Hermann , J. A. Hinton , W. Hofmann , C. Hoischen , T. L. Holch , M. Holler , D. Horns , D. Huber , H. Iwasaki , A. Jacholkowska , M. Jamrozy , D. Jankowsky , F. Jankowsky , L. Jouvin , I. Jung-Richardt , M. A. Kastendieck , K. Katarzyński , M. Katsuragawa , U. Katz , D. Kerszberg , D. Khangulyan , B. Khélifi , J. King , S. Klepser , W. Kluźniak , Nu. Komin , K. Kosack , S. Krakau , M. Kraus , P. P. Krüger , G. Lamanna , J. Lau , J. Lefaucheur , A. Lemière , M. Lemoine-Goumard , J. -P. Lenain , E. Leser , T. Lohse , M. Lorentz , R. López-Coto , I. Lypova , D. Malyshev , V. Marandon , A. Marcowith , C. Mariaud , G. Guillem Martí-Devesa , R. Marx , G. Maurin , P. J. Meintjes , A. M. W. Mitchell , R. Moderski , M. Mohamed , L. Mohrmann , E. Moulin , T. Murach , S. Nakashima , M. de Naurois , H. Ndiyavala , F. Niederwanger , J. Niemiec , L. Oakes , P. O'Brien , H. Odaka , S. Ohm , M. Ostrowski , I. Oya , M. Padovani , M. Panter , R. D. Parsons , C. Perennes , P. -O. Petrucci , B. Peyaud , Q. Piel , S. Pita , V. Poireau , A. Priyana Noel , D. A. Prokhorov , H. Prokoph , G. Pühlhofer , M. Punch , A. Quirrenbach , S. Raab , R. Rauth , A. Reimer , O. Reimer , M. Renaud , F. Rieger , L. Rinchiuso , C. Romoli , G. Rowell , B. Rudak , E. Ruiz-Velasco , V. Sahakian , S. Saito , D. A. Sanchez , A. Santangelo , M. Sasaki , R. Schlickeiser , F. Schüssler , A. Schulz , U. Schwanke , S. Schwemmer , M. Seglar-Arroyo , M. Senniappan , A. S. Seyffert , N. Shafi , I. Shilon , K. Shiningayamwe , R. Simoni , A. Sinha , H. Sol , F. Spanier , A. Specovius , M. Spir-Jacob , Ł. Stawarz , R. Steenkamp , C. Stegmann , C. Steppa , I. Sushch , T. Takahashi , J. -P. Tavernet , T. Tavernier , A. M. Taylor , R. Terrier , L. Tibaldo , D. Tiziani , M. Tluczykont , C. Trichard , M. Tsirou , N. Tsuji , R. Tuffs , Y. Uchiyama , D. J. van der Walt , C. van Eldik , C. van Rensburg , B. van Soelen , G. Vasileiadis , J. Veh , C. Venter , A. Viana , P. Vincent , J. Vink , F. Voisin , H. J. Völk , T. Vuillaume , Z. Wadiasingh , S. J. Wagner , P. Wagner , R. M. Wagner , R. White , A. Wierzcholska , A. Wörnlein , R. Yang , D. Zaborov , M. Zacharias , R. Zanin , A. A. Zdziarski , A. Zech , F. Zefi , A. Ziegler , J. Zorn , N. Żywucka

Multiwavelength Observations of Markarian 421 in 2005 - 2006

Since September 2005, the Whipple 10m Gamma-ray Telescope has been operated primarily as a blazar monitor. The five Northern Hemisphere blazars that have already been detected at the Whipple Observatory, Markarian 421, H1426+428, Markarian…

High Energy Astrophysical Phenomena · Physics 2011-02-11 D. Horan , V. A. Acciari , S. M. Bradbury , J. H. Buckley , V. Bugaev , K. L. Byrum , A. Cannon , O. Celik , A. Cesarini , Y. C. K. Chow , L. Ciupik , P. Cogan , A. D. Falcone , S. J. Fegan , J. P. Finley , P. Fortin , L. F. Fortson , D. Gall , G. H. Gillanders , J. Grube , G. Gyuk , D. Hanna , E. Hays , M. Kertzman , J. Kildea , A. Konopelko , H. Krawczynski , F. , M. J. Lang , K. Lee , P. Moriarty , T. Nagai , J. Niemiec , R. A. Ong , J. S. Perkins , M. Pohl , J. Quinn , P. T. Reynolds , H. J. Rose , G. H. Sembroski , A. W. Smith , D. Steele , S. P. Swordy , J. A. Toner , V. V. Vassiliev , S. P. Wakely , T. C. Weekes , R. J. White , D. A. Williams , M. D. Wood , B. Zitzer , H. D. Aller , M. F. Aller , M. Baker , D. Barnaby , M. T. Carini , P. Charlot , J. P. Dumm , N. E. Fields , T. Hovatta , B. Jordan , Y. A. Kovalev , Y. Y. Kovalev , H. A. Krimm , O. M. Kurtanidze , A. Lahteenmaki , J. F. Le Campion , J. Maune , T. Montaruli , A. C. Sadun , S. Smith , M. Tornikoski , M. Turunen , R. Walters

TeV Gamma-ray Observations of Markarian 421 using TACTIC during 2009-10

We have observed the blazar Markarian 421 with the TACTIC $\gamma$-ray telescope at Mt. Abu, India, from 22 November 2009 to 16 May 2010 for 265 hours. Detailed analysis of the data so recorded revealed presence of a TeV $\gamma$-ray signal…

High Energy Astrophysical Phenomena · Physics 2015-06-04 P. Chandra , R. C. Rannot , K. K. Yadav , A. K. Tickoo , K. K. Singh , K. Chanchalani , M. Kothari , N. K. Agarwal , A. Goyal , H. C. Goyal , S. Kotwal , N. Kumar , P. Marandi , K. Venugopal , C. K. Bhat , N. Bhatt , S. Bhattacharya , C. Borwankar , N. Chouhan , V. K. Dhar , S. R. Kaul , S. K. Koul , M. K. Koul , R. Koul , A. K. Mitra , S. Sahayanathan , M. Sharma

The NuSTAR view on Hard-TeV BL Lacs

Hard-TeV BL Lacs are a new type of blazars characterized by a hard intrinsic TeV spectrum, locating the peak of their gamma-ray emission in the spectral energy distribution (SED) above 2-10 TeV. Such high energies are problematic for the…

High Energy Astrophysical Phenomena · Physics 2018-05-16 L. Costamante , G. Bonnoli , F. Tavecchio , G. Ghisellini , G. Tagliaferri , D. Khangulyan

A Study of High Energy Emission from the TeV blazar Mrk 501 during Multiwavelength Observations in 1996

We present the results of a multiwavelength campaign for Mrk 501 performed in March 1996 with ASCA, EGRET, Whipple, and optical telescopes. In the X-ray band, a spectral break was observed around 2 keV. We report here for the first time the…

Astrophysics · Physics 2009-10-31 J. Kataoka , J. R. Mattox , J. Quinn , H. Kubo , F. Makino , T. Takahashi , S. Inoue , R. C. Hartman , G. M. Madejski , P. Sreekumar , S. J. Wagner

Long-term Monitoring on Mrk 501 for Its VHE gamma Emission and a Flare in October 2011

As one of the brightest active blazars in both X-ray and very high energy $\gamma$-ray bands, Mrk 501 is very useful for physics associated with jets from AGNs. The ARGO-YBJ experiment is monitoring it for $\gamma$-rays above 0.3 TeV since…

High Energy Astrophysical Phenomena · Physics 2012-09-20 YBJ Collaboration , B. Bartoli , P. Bernardini , X. J. Bi , C. Bleve , I. Bolognino , P. Branchini , A. Budano , A. K. Calabrese Melcarne , P. Camarri , Z. Cao , R. Cardarelli , S. Catalanotti , C. Cattaneo , S. Z. Chen , T. L. Chen , Y. Chen , P. Creti , S. W. Cui , B. Z. Dai , G. DAl Staiti , Danzengluobu , M. Dattoli , I. De Mitri , B. D Ettorre Piazzoli , T. Di Girolamo , X. H. Ding , G. Di Sciascio , C. F. Feng , Zhaoyang Feng , Zhenyong Feng , F. Galeazzi , E. Giroletti , Q. B. Gou , Y. Q. Guo , H. H. He , Haibing Hu , Hongbo Hu , Q. Huang , M. Iacovacci , R. Iuppa , I. James , H. Y. Jia , Labaciren , H. J. Li , J. Y. Li , X. X. Li , G. Liguori , C. Liu , C. Q. Liu , J. Liu , M. Y. Liu , H. Lu , L. L. Ma , X. H. Ma , G. Mancarella , S. M. Mari , G. Marsella , D. Martello , S. Mastroianni , P. Montini , C. C. Ning , A. Pagliaro , M. Panareo , B. Panico , L. Perrone , P. Pistilli , F. Ruggieri , P. Salvini , R. Santonico , P. R. Shen , X. D. Sheng , F. Shi , C. Stanescu , A. Surdo , Y. H. Tan , P. Vallania , S. Vernetto , C. Vigorito , B. Wang , H. Wang , C. Y. Wu , H. R. Wu , B. Xu , L. Xue , Q. Y. Yang , X. C. Yang , Z. G. Yao , A. F. Yuan , M. Zha , H. M. Zhang , Jilong Zhang , Jianli Zhang , L. Zhang , P. Zhang , X. Y. Zhang , Y. Zhang , J. Zhao , Zhaxiciren , Zhaxisangzhu , X. X. Zhou , F. R. Zhu , Q. Q. Zhu , G. Zizzi

Self-consistent neutrino and UHE cosmic ray spectra from Mrk 421

We examine the neutrino and cosmic ray spectra resulting from two models of fitting the spectral energy distribution (SED) of the blazar Mrk~421 using a self-consistent leptohadronic code. The $\gamma$-ray emission is attributed to either…

High Energy Astrophysical Phenomena · Physics 2015-06-17 Stavros Dimitrakoudis , Maria Petropoulou , Apostolos Mastichiadis

Multi-wavelength study of the short term TeV flaring activity from the blazar Mrk 501 observed in June 2014

In this work, we study the short term flaring activity from the high synchrotron peaked blazar Mrk 501 detected by the FACT and H.E.S.S. telescopes in the energy range 2-20 TeV during June 23-24, 2014 (MJD 56831.86-56831.94). We revisit…

High Energy Astrophysical Phenomena · Physics 2018-12-26 K K Singh , H Bhatt , S Bhattacharyya , N Bhatt , A K Tickoo , R C Rannot

Multiwavelength picture of the blazar S5 0716+714 during its brightest outburst

S5 0716+714 is a well known BL Lac object, one of the brightest and most active blazars. The discovery in the Very High Energy band (VHE, E > 100 GeV) by MAGIC happened in 2008. In January 2015 the source went through the brightest optical…

High Energy Astrophysical Phenomena · Physics 2017-04-12 Marina Manganaro , Giovanna Pedaletti , Marlene Doert , Denis Bastieri , Vandad Fallah Ramazani , Dario Gasparrini , Elina Lindfors , Benoit Lott , Mireia Nievas , Bindu Rani , David J. Thompson , Emmanouil Angelakis , George Borman , Mark Gurwell , Talvikki Hovatta , Ryosuke Itoh , Svetlana Jorstad , Alex Kraus , Thomas P. Krichbaum , Paul Kuin , Anne Lähteenmäki , Valeri Larionov , Amy Yarleen Lien , Ioannis Myserlis , Merja Tornikoski , Ivan Troitsky , J. Anton Zensus

Reconcilement of VHE $\gamma$-ray/X-ray correlation studies in Mrk 421 and break-down at high fluxes

Multi-wavelength campaigns have been carried out to study the correlation between the very high energy (VHE) $\gamma$-ray and the X-ray emissions in blazars but, no conclusive results have been achieved yet. In this paper, we add Milagro…

High Energy Astrophysical Phenomena · Physics 2019-01-30 M. M. González , B. Patricelli , N. Fraija , J. A. García-González

Dissecting the radiation mechanism of short GRB~160821B through multi-wavelength modelling

GRB~160821B is the only short GRB detected to date at very high energy (VHE, $\gtrsim 100$ GeV). At a redshift $z=0.161$, it was detected by MAGIC telescopes approximately four hours since the trigger. VHE dataset was complied with the…

High Energy Astrophysical Phenomena · Physics 2025-10-02 Ankur Ghosh , Monica Barnard , Jagdish C. Joshi , Soebur Razzaque

VHE gamma-ray spectral properties of the blazars Mrk 501 and Mrk 421 from CAT observations in 1997 and 1998

The Very High Energy (VHE) gamma-ray emission of the BL Lacertae objects Markarian 501 and Markarian 421 has been observed by the CAT Imaging Atmospheric Cherenkov Telescope in 1997 and 1998. The spectrum extraction method is presented, and…

Astrophysics · Physics 2019-08-14 Frederic Piron

MAGIC discovery of VHE Emission from the FSRQ PKS 1222+21

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 observation (~0.5 hr) performed on 2010 June 17. The MAGIC…

High Energy Astrophysical Phenomena · Physics 2011-03-07 J. Aleksić , L. Antonelli , P. Antoranz , M. Backes , J. Barrio , D. Bastieri , J. Becerra González , W. Bednarek , A. Berdyugin , K. Berger , E. Bernardini , A. Biland , O. Blanch , R. Bock , A. Boller , G. Bonnoli , D. Borla Tridon , I. Braun , Dr. Thomas Bretz , A. Cañellas , E. Carmona , A. Carosi , P. Colin , E. Colombo , J. Contreras , J. Cortina , L. Cossio , S. Covino , F. Dazzi , A. De Angelis , E. De Cea del Pozo , Dr. Barbara De Lotto , Dr. Carlos Delgado Mendez , A. Diago Ortega , M. Doert , A. Domìnguez , D. Dominis Prester , D. Dorner , M. Doro , D. Elsaesser , D. Ferenc , M. Fonseca , L. Font , C. Fruck , R. Garcìa Lòpez , M. Garczarczyk , D. Garrido , G. Giavitto , N. Godinović , D. Hadasch , D. Häfner , A. Herrero , D. Hildebrand , D. Höhne-Mönch , J. Hose , D. Hrupec , B. Huber , T. Jogler , S. Klepser , T. Krahenbuhl , J. Krause , A. La Barbera , D. Lelas , E. Leonardo , E. Lindfors , S. Lombardi , M. López , E. Lorenz , M. Makariev , G. Maneva , N. Mankuzhiyil , K. Mannheim , L. Maraschi , M. Mariotti , M. Martínez , Dr. Daniel Mazin , M. Meucci , J. Miranda , R. Mirzoyan , H. Miyamoto , Mr. Javier Moldón , A. Moralejo , D. Nieto , Dr. Kari Nilsson , R. Orito , I. Oya , D. Paneque , R. Paoletti , S. Pardo , J. Paredes , S. Partini , M. Pasanen , F. Pauss , M. Perez-Torres , Dr. Massimo Persic , L. Peruzzo , M. Pilia , J. Pochon , F. Prada , Dr. P. G. Prada Moroni , E. Prandini , I. Puljak , I. Reichardt , R. Reinthal , W. Rhode , Marc Ribó , Dr. Javier Rico , S. Rügamer , A. Saggion , Mr. Koji Saito , T. Saito , M. Salvati , K. Satalecka , V. Scalzotto , V. Scapin , C. Schultz , T. Schweizer , M. Shayduk , S. Shore , A. Sillanpää , J. Sitarek , D. Sobczynska , F. Spanier , S. Spiro , A. Stamerra , B. Steinke , J. Storz , N. Strah , T. Surić , L. Takalo , F. Tavecchio , P. Temnikov , T. Terzić , D. Tescaro , M. Teshima , M. Thom , O. Tibolla , Dr. Miguel-Angel Perez-Torres , A. Treves , H. Vankov , P. Vogler , R. Wagner , Q. Weitzel , V. Zabalza , F. Zandanel , R. Zanin , Y. Tanaka , D. Wood , S. Buson

Inverse Compton X-ray Emissions from TeV blazar Mrk421 during a Historical Low-Flux State Observed with NuSTAR

We report on the detection of excess hard X-ray emission from the TeV BL Lac object Mrk421 during the historical low-flux state of the source in January 2013. NuSTAR observations were conducted four times between MJD56294 and MJD56312 with…

High Energy Astrophysical Phenomena · Physics 2016-08-17 Jun Kataoka , Lukasz Stawarz

Study of the long-term Very High Energy emission of the blazars 1ES 1215+3031 and VER J0521+211 with the HAWC gamma-ray observatory

Blazars are the most abundant type of extragalactic gamma-ray source, usually presenting high variability across the electromagnetic spectrum. Their Very High Energy (VHE, above 0.1 TeV) emission has been studied in detail using Air…

High Energy Astrophysical Phenomena · Physics 2023-10-05 Fernando Ureña-Mena , Alberto Carramiñana , Anna Lia Longinotti , Daniel Rosa-González , HAWC Collaboration

Multiwavelength observations of a VHE gamma-ray flare from PKS 1510-089 in 2015

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 temporal properties of the PKS 1510-089 emission during a…

High Energy Astrophysical Phenomena · Physics 2020-01-09 MAGIC Collaboration , M. L. Ahnen , S. Ansoldi , L. A. Antonelli , C. Arcaro , A. Babić , B. Banerjee , P. Bangale , U. Barres de Almeida , J. A. Barrio , J. Becerra González , W. Bednarek , E. Bernardini , A. Berti , B. Biasuzzi , A. Biland , O. Blanch , S. Bonnefoy , G. Bonnoli , F. Borracci , T. Bretz , R. Carosi , A. Carosi , A. Chatterjee , P. Colin , E. Colombo , J. L. Contreras , J. Cortina , S. Covino , P. Cumani , P. Da Vela , F. Dazzi , A. De Angelis , B. De Lotto , E. de Oña Wilhelmi , F. Di Pierro , M. Doert , A. Domínguez , D. Dominis Prester , D. Dorner , M. Doro , S. Einecke , D. Eisenacher Glawion , D. Elsaesser , M. Engelkemeier , V. Fallah Ramazani , A. Fernández-Barral , D. Fidalgo , M. V. Fonseca , L. Font , C. Fruck , D. Galindo , R. J. García López , M. Garczarczyk , M. Gaug , P. Giammaria , N. Godinović , D. Gora , D. Guberman , D. Hadasch , A. Hahn , T. Hassan , M. Hayashida , J. Herrera , J. Hose , D. Hrupec , G. Hughes , K. Ishio , Y. Konno , H. Kubo , J. Kushida , D. Kuveždić , D. Lelas , E. Lindfors , S. Lombardi , F. Longo , M. López , P. Majumdar , M. Makariev , G. Maneva , M. Manganaro , K. Mannheim , L. Maraschi , M. Mariotti , M. Martínez , D. Mazin , U. Menzel , R. Mirzoyan , A. Moralejo , E. Moretti , D. Nakajima , V. Neustroev , A. Niedzwiecki , M. Nievas Rosillo , K. Nilsson , K. Nishijima , K. Noda , L. Nogués , S. Paiano , J. Palacio , M. Palatiello , D. Paneque , R. Paoletti , J. M. Paredes , X. Paredes-Fortuny , G. Pedaletti , M. Peresano , L. Perri , M. Persic , J. Poutanen , P. G. Prada Moroni , E. Prandini , I. Puljak , J. R. Garcia , I. Reichardt , W. Rhode , M. Ribó , J. Rico , T. Saito , K. Satalecka , S. Schroeder , T. Schweizer , S. N. Shore , A. Sillanpää , J. Sitarek , I. Šnidarić , D. Sobczynska , A. Stamerra , M. Strzys , T. Surić , L. Takalo , F. Tavecchio , P. Temnikov , T. Terzić , D. Tescaro , M. Teshima , D. F. Torres , N. Torres-Albà , T. Toyama , A. Treves , G. Vanzo , M. Vazquez Acosta , I. Vovk , J. E. Ward , M. Will , M. H. Wu , D. Zarić , R. Desiante , J. Becerra González , F. D'Ammando , S. Larsson , C. M. Raiteri , R. Reinthal , A. Lähteenmäki , E. Järvelä , M. Tornikoski , V. Ramakrishnan , S. G. Jorstad , A. P. Marscher , V. Bala , N. R. MacDonald , N. Kaur , Sameer , K. Baliyan , J. A. Acosta-Pulido , C. Lazaro , C. Martínez-Lombilla , A. B. Grinon-Marin , A. Pastor Yabar , C. Protasio , M. I. Carnerero , H. Jermak , I. A. Steele , V. M. Larionov , G. A. Borman , T. S. Grishina

Long-term multiwavelength observations of 1ES 1218+304: physical implications of the flux and spectral variability

This paper presents the results of a detailed timing and spectral analysis of the TeV-detected blazar 1ES 1218+304, focused on the observations performed with the different instruments onboard the Neil Gehrels Swift Observatory in the…

Astrophysics of Galaxies · Physics 2025-04-22 B. Kapanadze , A. Gurchumelia , M. Aller

Fermi-LAT Observations of Markarian 421: the Missing Piece of its Spectral Energy Distribution

We report on the gamma-ray activity of the high-synchrotron-peaked BL Lacertae object Mrk 421 during the first 1.5 years of Fermi operation, from 2008 August 5 to 2010 March 12. We find that the Large Area Telescope (LAT) gamma-ray spectrum…

High Energy Astrophysical Phenomena · Physics 2015-05-28 LAT collaboration , A. A. Abdo et al. , the MAGIC collaboration , : , J. Aleksić , the GASP-WEBT consortium , multi-wavelength partners