Related papers: Markarian 501 in X-ray bright state - RXTE observa…

Multiwavelength Observations of a Flare from Markarian 501

We present multiwavelength observations of the BL Lacertae object Markarian 501 (Mrk 501) in 1997 between April 8 and April 19. Evidence of correlated variability is seen in very high energy (VHE, E > 350 GeV) gamma-ray observations taken…

Astrophysics · Physics 2009-10-30 M. Catanese , S. M. Bradbury , A. C. Breslin , J. H. Buckley , D. A. Carter-Lewis , M. F. Cawley , C. D. Dermer , D. J. Fegan , J. P. Finley , J. A. Gaidos , A. M. Hillas , W. N. Johnson , F. Krennrich , R. C. Lamb , R. W. Lessard , D. J. Macomb , J. E. McEnery , P. Moriarty , J. Quinn , A. J. Rodgers , H. J. Rose , F. W. Samuelson , G. H. Sembroski , R. Srinivasan , T. C. Weekes , J. Zweerink

A Rapid X-ray Flare from Markarian 501

We present X-ray observations of the BL Lacertae (BL Lac) object Markarian 501 (Mrk 501), taken with the Rossi X-ray Timing Explorer in 1998 May as part of a multi-wavelength campaign. The X-ray light curve shows a very rapid flare in which…

Astrophysics · Physics 2016-08-30 Michael Catanese , Rita M. Sambruna

Variable VHE gamma-ray emission from Markarian 501

The blazar Markarian 501 (Mrk 501) was observed at energies above 0.10 TeV with the MAGIC telescope from May through July 2005. The high sensitivity of the instrument enabled the determination of the flux and spectrum of the source on a…

Astrophysics · Physics 2010-11-11 J. Albert et al

Study of the Flux and Spectral Variations in the VHE Emission from the Blazar Markarian 501, with the MAGIC Telescope

The blazar Markarian 501 (Mrk 501) was observed above 100 GeV with the MAGIC Telescope during May, June and July 2005. The high sensitivity of the instrument made possible the detection of the source with high significance in each of the…

Astrophysics · Physics 2009-06-23 D. Paneque

X-ray/TeV-gamma-ray observations of several strong flares of Mkn 501 during 1997 and implications

During more than 6 months in 1997, the BL Lac object Mkn 501 was in an exceptionally bright state, both in the X-ray band and in the Very High Energy (VHE) band. In this paper we present a multiwavelength study of Mkn 501 during this…

Astrophysics · Physics 2007-05-23 H. Krawczynski , P. S. Coppi , T. Maccarone , F. A. Aharonian

VHE gamma-ray observations of Markarian 501

Markarian 501, a nearby (z=0.033) X-ray selected BL Lacertae object, is a well established source of Very High Energy (VHE, E>=300 GeV) gamma rays. Dramatic variability in its gamma-ray emission on time-scales from years to as short as two…

Astrophysics · Physics 2007-05-23 Whipple Collaboration , A. C. Breslin , I. H. Bond , S. M. Bradbury , J. H. Buckley , A. M. Burdett , M. J. Carson , D. A. Carter-Lewis , M. Catanese , M. F. Cawley , S. Dunlea , M. D'Vali , D. J. Fegan , S. J. Fegan , J. P. Finley , J. A. Gaidos , T. A. Hall , A. M. Hillas , D. Horan , J. Kildea , J. Knapp , F. Krennrich , S. LeBohec , R. W. Lessard , C. Masterson , B. McKernan , J. Quinn , H. J. Rose , F. W. Samuelson , G. H. Sembroski , V. V. Vassiliev , T. C. Weekes

We present exactly simultaneous X-ray and TeV monitoring with {\it RXTE} and HEGRA of the TeV blazar Mrk 501 during 15 days in 1998 June. After an initial period of very low flux at both wavelengths, the source underwent a remarkable flare…

Astrophysics · Physics 2009-10-31 Rita M. Sambruna

Multiwavelength Observations of Mrk 501 in 2008

The well-studied VHE (E >100 GeV) blazar Mrk 501 was observed between March and May 2008 as part of an extensive multiwavelength observation campaign including radio, optical, X-ray and VHE gamma-ray instruments. Mrk 501 was in a low state…

High Energy Astrophysical Phenomena · Physics 2009-07-08 D. Kranich , D. Paneque , A. Cesarini , A. Falcone , M. Giroletti , E. Hoversten , T. Hovatta , Y. Y. Kovalev , A. Lahteenmaki , E. Nieppola , C. Pagani , A. Pichel , K. Satalecka , J. Scargle , D. Steele , F. Tavecchio , D. Tescaro , M. Tornikoski , M. Villata

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

Study of the variable broadband emission of Markarian 501 during the most extreme Swift X-ray activity

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 operation of the Neil Gehrels Swift Gamma-ray Burst…

High Energy Astrophysical Phenomena · Physics 2021-03-17 MAGIC Collaboration , V. A. Acciari , S. Ansoldi , L. A. Antonelli , A. Babić , B. Banerjee , U. Barres de Almeida , J. A. Barrio , J. Becerra González , W. Bednarek , E. Bernardini , A. Berti , J. Besenrieder , W. Bhattacharyya , C. Bigongiari , O. Blanch , G. Bonnoli , G. Busetto , R. Carosi , G. Ceribella , S. Cikota , S. M. Colak , P. 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 , F. Di Pierro , E. Do Souto Espiñera , A. Domínguez , D. Dominis Prester , M. Doro , V. Fallah Ramazani , A. Fattorini , A. Fernández-Barral , G. Ferrara , D. Fidalgo , L. Foffano , M. V. Fonseca , L. Font , C. Fruck , D. Galindo , S. Gallozzi , R. J. García López , M. Garczarczyk , S. Gasparyan , M. Gaug , P. Giammaria , N. Godinović , D. Guberman , D. Hadasch , A. Hahn , T. Hassan , J. Herrera , J. Hoang , D. Hrupec , S. Inoue , K. Ishio , Y. Iwamura , H. Kubo , J. Kushida , D. Kuveždić , A. Lamastra , D. Lelas , F. Leone , E. Lindfors , S. Lombardi , F. Longo , M. López , A. López-Oramas , B. Machado de Oliveira Fraga , C. Maggio , P. Majumdar , M. Makariev , M. Mallamaci , G. Maneva , M. Manganaro , L. Maraschi , M. Mariotti , M. Martínez , S. Masuda , D. Mazin , M. Minev , J. M. Miranda , R. Mirzoyan , E. Molina , A. Moralejo , V. Moreno , E. Moretti , P. Munar-Adrove r , V. Neustroev , A. Niedzwiecki , M. Nievas Rosillo , C. Nigro , K. Nilsson , D. Ninci , K. Nishijima , K. Noda , L. Nogués , S. Paiano , J. Palacio , D. Paneque , R. Paoletti , J. M. Paredes , G. Pedaletti , P. Peñil , M. Peresano , M. Persic , P. G. Prada Moroni , E. Prandini , I. Puljak , J. R. Garcia , M. Ribó , J. Rico , C. Righi , A. Rugliancich , L. Saha , N. Sahakyan , T. Saito , K. Satalecka , T. Schweizer , J. Sitarek , I. Šnidarić , D. Sobczynska , A. Somero , A. Stamerra , M. Strzys , T. Surić , F. Tavecchio , P. Temnikov , T. Terzić , M. Teshima , N. Torres-Albá , S. Tsujimoto , J. van Scherpenberg , G. Vanzo , M. Vazquez Acosta , I. Vovk , M. Will , D. Zarić , FACT Collaboration , : , A. Arbet-Engels , D. Baack , M. Balbo , A. Biland , M. Blank , T. Bretz , K. Bruegge , M. Bulinski , J. Buss , M. Doerr , D. Dorner , S. Einecke , D. Elsaesser , D. Hildebrand , L. Linhoff , K. Mannheim , S. Mueller , D. Neise , A. Neronov , M. Noethe , A. Paravac , W. Rhode , B. Schleicher , F. Schulz , K. Sedlaczek , A. Shukla , V. Sliusar , E. von Willert , R. Walter , C. Wendel , A. Tramacere , A. Lien , M. Perri , F. Verrecchia , M. Armas Padilla , C. Leto , A. Lähteenmäki , M. Tornikoski , J. Tammi

Insights Into the High-Energy Gamma-ray Emission of Markarian 501 from Extensive Multifrequency Observations in the Fermi Era

We report on the gamma-ray activity of the blazar Mrk 501 during the first 480 days of Fermi operation. We find that the average LAT gamma-ray spectrum of Mrk 501 can be well described by a single power-law function with a photon index of…

High Energy Astrophysical Phenomena · Physics 2015-05-20 LAT collaboration , A. A. Abdo et al. , the MAGIC collaboration , : , J. Aleksić et al. , the VERITAS collaboration , : , V. A. Acciari et al. , the GASP-WEBT consortium , multi-wavelength partners

Spectral characteristics of Mrk 501 during the 2012 and 2014 flaring states

Observations at Very High Energies (VHE, E > 100 GeV) of the BL Lac object Mrk 501 taken with the High Energy Stereoscopic System (H.E.S.S.) in four distinct periods between 2004 and 2014 are presented, with focus on the 2012 and 2014…

High Energy Astrophysical Phenomena · Physics 2019-08-15 Gabriele Cologna , Nachiketa Chakraborty , Mahmoud Mohamed , Frank Rieger , Carlo Romoli , Andrew Taylor , Stefan J. Wagner , Alicja Wierzcholska , Agnieszka Jacholkowska

Extreme synchrotron blazars: the case of Mkn 501

BeppoSAX observations of Mkn501 in April 1997 (Pian et al. 1998), have revealed an extraordinary X-ray emission from this BL Lac object, during a phase of high activity at TeV energies, as monitored with the Whipple, HEGRA and CAT Cerenkov…

Astrophysics · Physics 2015-06-24 G. Ghisellini

The Flux Variability of Markarian 501 in Very High Energy Gamma Rays

The BL Lacertae object Markarian 501 was identified as a source of gamma-ray emission at the Whipple Observatory in March 1995. Here we present a flux variability analysis on several times-scales of the 233 hour data set accumulated over…

Astrophysics · Physics 2009-10-31 J. Quinn , I. H. Bond , P. J. Boyle , S. M. Bradbury , A. C. Breslin , J. H. Buckley , A. M. Burdett , J. Bussons Gordo , D. A. Carter-Lewis , M. Catanese , M. F. Cawley , D. J. Fegan , J. P. Finley , J. A. Gaidos , T. Hall , A. M. Hillas , F. Krennrich , R. C. Lamb , R. W. Lessard , C. Masterson , J. E. McEnery , P. Moriarty , A. J. Rodgers , H. J. Rose , F. W. Samuelson , G. H. Sembroski , R. Srinivasan , V. V. Vassiliev , T. C. Weekes

Multiwavelength observations of Mrk 501 in 2008

Mrk 501 is one of the brightest blazars at TeV energies and has been extensively studied since its first VHE detection in 1996. Our goal is to characterize in detail the source gamma-ray emission, together with the radio-to-X-ray emission,…

High Energy Astrophysical Phenomena · Physics 2015-06-23 MAGIC Collaboration , J. Aleksić , S. Ansoldi , L. A. Antonelli , P. Antoranz , A. Babic , P. Bangale , U. Barres de Almeida , J. A. Barrio , J. Becerra González , W. Bednarek , K. Berger , E. Bernardini , A. Biland , O. Blanch , R. K. Bock , S. Bonnefoy , G. Bonnoli , F. Borracci , T. Bretz , E. Carmona , A. Carosi , D. Carreto Fidalgo , P. Colin , E. Colombo , J. L. Contreras , J. Cortina , S. Covino , P. Da Vela , F. Dazzi , A. De Angelis , G. De Caneva , B. De Lotto , C. Delgado Mendez , M. Doert , A. Domínguez , D. Dominis Prester , D. Dorner , M. Doro , S. Einecke , D. Eisenacher , D. Elsaesser , E. Farina , D. Ferenc , M. V. Fonseca , L. Font , K. Frantzen , 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 , A. Herrero , D. Hildebrand , J. Hose , D. Hrupec , W. Idec , V. Kadenius , H. Kellermann , M. L. Knoetig , J. Krause , J. Kushida , A. La Barbera , D. Lelas , N. Lewandowska , E. Lindfors , S. Lombardi , M. López , R. López-Coto , A. López-Oramas , E. Lorenz , I. Lozano , M. Makariev , K. Mallot , G. Maneva , N. Mankuzhiyil , K. Mannheim , L. Maraschi , B. Marcote , M. Mariotti , M. Martínez , D. Mazin , U. Menzel , M. Meucci , J. M. Miranda , R. Mirzoyan , A. Moralejo , P. Munar-Adrover , D. Nakajima , A. Niedzwiecki , K. Nilsson , N. Nowak , R. Orito , A. Overkemping , S. Paiano , M. Palatiello , D. Paneque , R. Paoletti , J. M. Paredes , X. Paredes-Fortuny , S. Partini , M. Persic , F. Prada , P. G. Prada Moroni , E. Prandini , S. Preziuso , I. Puljak , R. Reinthal , W. Rhode , M. Ribó , J. Rico , J. Rodriguez Garcia , S. Rügamer , A. Saggion , T. Saito , K. 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 , V. Stamatescu , A. Stamerra , T. Steinbring , J. Storz , S. Sun , T. Surić , L. Takalo , F. Tavecchio , P. Temnikov , T. Terzić , D. Tescaro , M. Teshima , J. Thaele , O. Tibolla , D. F. Torres , T. Toyama , A. Treves , M. Uellenbeck , P. Vogler , R. M. Wagner , F. Zandanel , R. Zanin , VERITAS Collaboration , : , B. Behera , M. Beilicke , W. Benbow , K. Berger , R. Bird , A. Bouvier , V. Bugaev , M. Cerruti , X. Chen , L. Ciupik , E. Collins-Hughes , W. Cui , C. Duke , J. Dumm , A. Falcone , S. Federici , Q. Feng , J. P. Finley , L. Fortson , A. Furniss , N. Galante , G. H. Gillanders , S. Griffin , S. T. Griffiths , J. Grube , G. Gyuk , D. Hanna , J. Holder , C. A. Johnson , P. Kaaret , M. Kertzman , D. Kieda , H. Krawczynski , M. J. Lang , A. S Madhavan , G. Maier , P. Majumdar , K. Meagher , P. Moriarty , R. Mukherjee , D. Nieto , A. O'Faoláin de Bhróithe , R. A. Ong , A. N. Otte , A. Pichel , M. Pohl , A. Popkow , H. Prokoph , J. Quinn , J. Rajotte , G. Ratliff , L. C. Reyes , P. T. Reynolds , G. T. Richards , E. Roache , G. H. Sembroski , K. Shahinyan , F. Sheidaei , A. W. Smith , D. Staszak , I. Telezhinsky , M. Theiling , J. Tyler , A. Varlotta , S. Vincent , S. P. Wakely , T. C. Weekes , R. Welsing , D. A. Williams , A. Zajczyk , B. Zitzer , External Collaborators , : , M. Villata , C. M. Raiteri , M. Ajello , M. Perri , H. D. Aller , M. F. Aller , V. M. Larionov , N. V. Efimova , T. S. Konstantinova , E. N. Kopatskaya , W. P. Chen , E. Koptelova , H. Y. Hsiao , O. M. Kurtanidze , M. G. Nikolashvili , G. N. Kimeridze , B. Jordan , P. Leto , C. S. Buemi , C. Trigilio , G. Umana , A. Lahtenmaki , E. Nieppola , M. Tornikoski , J. Sainio , V. Kadenius , M. Giroletti , A. Cesarini , L. Fuhrmann , Yu. A. Kovalev , Y. Y. Kovalev

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

Very High Energy Gamma-ray spectral properties of Mrk 501 from CAT Cerenkov telescope observations in 1997

The BL Lac object Mrk 501 went into a very high state of activity during 1997, both in VHE gamma-rays and X-rays. We present here results from observations at energies above 250 GeV carried out between March and October 1997 with the CAT…

Astrophysics · Physics 2007-05-23 A. Djannati-Atai , F. Piron , A. Barrau , L. Iacoucci , M. Punch , J. -P. Tavernet , R. Bazer-Bachi , H. Cabot , L. -M. Chounet , G. Debiais , B. Degrange , J. -P. Dezalay , D. Dumora , P. Espigat , B. Fabre , P. Fleury , G. Fontaine , C. Ghesquière , P. Goret , C. Gouiffes , I. A. Grenier , S. Le Bohec , I. Malet , C. Meynadier , G. Mohanty , E. Nuss , E. Paré , J. Québert , K. Ragan , C. Renault , M. Rivoal , L. Rob , K. Schahmaneche , D. A. Smith

Very High Energy outburst of Markarian 501 in May 2009

The very high energy (VHE; E $>$ 100 GeV) blazar Markarian 501 was observed between April 17 and May 5 (MJD 54938--54956), 2009, as part of an extensive multi-wavelength campaign from radio to VHE. Strong VHE $\gamma$-ray activity was…

High Energy Astrophysical Phenomena · Physics 2016-10-19 E. Aliu , S. Archambault , A. Archer , T. Arlen , T. Aune , A. Barnacka , B. Behera , M. Beilicke , W. Benbow , K. Berger , R. Bird , A. Bouvier , M. Böttcher , M. Buchovecky , J. H. Buckley , V. Bugaev , J. V Cardenzana , M. Cerruti , A. Cesarini , X. Chen , L. Ciupik , E. Collins-Hughes , M. P. Connolly , W. Cui , J. Dumm , J. D. Eisch , A. Falcone , S. Federici , Q. Feng , J. P. Finley , H. Fleischhack , P. Fortin , L. Fortson , A. Furniss , N. Galante , D. Gall , G. H. Gillanders , S. Griffin , S. T. Griffiths , J. Grube , G. Gyuk , M. Hütten , N. Håkansson , J. Holder , G. Hughes , T. B. Humensky , C. A. Johnson , P. Kaaret , P. Kar , N. Kelley-Hoskins , M. Kertzman , Y. Khassen , D. Kieda , M. Krause , H. Krawczynski , F. Krennrich , M. J. Lang , A. S Madhavan , G. Maier , S. McArthur , A. McCann , K. Meagher , J. Millis , P. Moriarty , R. Mukherjee , D. Nieto , A. O'Faoláin de Bhróithe , R. A. Ong , M. Orr , A. N. Otte , D. Pandel , N. Park , V. Pelassa , J. S. Perkins , A. Pichel , M. Pohl , A. Popkow , J. Quinn , K. Ragan , L. C. Reyes , P. T. Reynolds , E. Roache , J. Rousselle , A. C. Rovero , D. B. Saxon , G. H. Sembroski , K. Shahinyan , F. Sheidaei , C. Skole , A. W. Smith , D. Staszak , I. Telezhinsky , M. Theiling , N. W. Todd , J. V. Tucci , J. Tyler , A. Varlotta , V. V. Vassiliev , S. Vincent , S. P. Wakely , O. M. Weiner , A. Weinstein , R. Welsing , A. Wilhelm , D. A. Williams , B. Zitzer , M. G. Baring , J. Becerra Gónzalez , A. N. Cillis , D. Horan , D. Paneque

Periodicity in the TeV gamma rays and X rays from Markarian 501

Historical TeV gamma-ray flares from Markarian 501 was observed using Utah Seven Telescope Array (7TA) from the end of March to the end of July of 1997. The Rossi X-ray Timing Explorer All Sky Monitor (RXTE ASM) has been observing X rays…

Astrophysics · Physics 2012-08-27 The Utah Seven Telescope Array collaboration

The June 2008 flare of Markarian 421 from optical to TeV energies

We present optical to very-high energy (VHE) gamma-ray observations of Mrk 421 between 2008 May 24 and June 23. A high-energy (HE) gamma-ray signal was detected by AGILE-GRID during June 9-15, brighter than the average flux observed by…

Cosmology and Nongalactic Astrophysics · Physics 2019-08-15 R. M. Wagner , I. Donnarumma , J. Grube , M. Villata , C. M. Raiteri , C. -C. Hsu , K. Satalecka , E. Bernardini , P. Majumdar