Related papers: Coordinated Multiwavelength Observations of BL Lac…

The Great Markarian 421 Flare of February 2010: Multiwavelength variability and correlation studies

We report on variability and correlation studies using multiwavelength observations of the blazar Mrk 421 during the month of February, 2010 when an extraordinary flare reaching a level of $\sim$27~Crab Units above 1~TeV was measured in…

High Energy Astrophysical Phenomena · Physics 2020-04-06 A. U. Abeysekara , W. Benbow , R. Bird , A. Brill , R. Brose , M. Buchovecky , J. H. Buckley , J. L. Christiansen , A. J. Chromey , M. K. Daniel , J. Dumm , A. Falcone , Q. Feng , J. P. Finley , L. Fortson , A. Furniss , N. Galante , A. Gent , G. H. Gillanders , C. Giuri , O. Gueta , T. Hassan , O. Hervet , J. Holder , G. Hughes , 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 , P. Moriarty , R. Mukherjee , T. Nelson , D. Nieto , M. Nievas-Rosillo , S. O'Brien , R. A. Ong , A. N. Otte , N. Park , A. Petrashyk , A. Pichel , M. Pohl , R. R. Prado , E. Pueschel , J. Quinn , K. Ragan , P. T. Reynolds , G. T. Richards , E. Roache , A. C. Rovero , C. Rulten , I. Sadeh , M. Santander , G. H. Sembroski , K. Shahinyan , B. Stevenson , I. Sushch , J. Tyler , V. V. Vassiliev , S. P. Wakely , A. Weinstein , R. M. Wells , P. Wilcox , A. Wilhelm , D. A. Williams , B. Zitzer , 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 , G. Busetto , R. Carosi , G. Ceribella , Y. Chai , 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 , F. Di Pierro , E. Do Souto Espiñera , D. Dominis Prester , D. Dorner , M. Doro , S. Einecke , D. Elsaesser , 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 , N. Godinović , D. Green , D. Guberman , D. Hadasch , A. Hahn , J. Herrera , J. Hoang , D. Hrupec , S. Inoue , K. Ishio , Y. Iwamura , H. Kubo , J. Kushida , A. Lamastra , D. Lelas , F. Leone , E. Lindfors , S. Lombardi , F. Longo , M. López , R. López-Coto , A. López-Oramas , 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 , S. Masuda , D. Mazin , D. Miceli , M. Minev , J. M. Miranda , R. Mirzoyan , E. Molina , A. Moralejo , D. Morcuende , V. Moreno , E. Moretti , P. Munar-Adrover , V. Neustroev , A. Niedzwiecki , M. Nievas Rosillo , C. Nigro , K. Nilsson , D. Ninci , K. Nishijima , K. Noda , L. Nogués , M. Nöthe , 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 , K. Satalecka , T. Schweizer , J. Sitarek , I. Šnidarić , D. Sobczynska , A. Somero , A. Stamerra , D. Strom , M. Strzys , S. Sun , T. Surić , F. Tavecchio , P. Temnikov , T. Terzić , M. Teshima , N. Torres-Albà , S. Tsujimoto , J. van Scherpenberg , G. Vanzo , M. Vazquez Acosta , I. Vovk , M. Will , D. Zarić , H. D. Aller , M. F. Aller , M. T. Carini , D. Horan , B. Jordan , Svetlana G. Jorstad , O. M. Kurtanidze , S. O. Kurtanidze , A. Lähteenmäki , V. M. Larionov , E. G. Larionova , G. Madejski , Alan P. Marscher , W. Max-Moerbeck , J. Ward Moody , D. A. Morozova , M. G. Nikolashvili , C. M. Raiteri , A. C. S. Readhead , J. L. Richards , Alberto C. Sadun , T. Sakamoto , L. A. Sigua , P. S. Smith , H. Talvikki , J. Tammi , M. Tornikoski , I. S. Troitsky , M. Villata

Cm-Wavelength Total Flux and Linear Polarization Properties of Radio-Loud BL Lacertae Objects

Results from a long-term program to quantify the range of behavior of the cm-wavelength total flux and linear polarization variability properties of a sample of 41 radio-loud BL Lac objects using weekly to tri-monthly observations with the…

Astrophysics · Physics 2009-10-31 Margo F. Aller , Hugh D. Aller , Philip A. Hughes , George E. Latimer

Radio-optical flux behavior and spectral energy distribution of the intermediate blazar GC 0109+224

About twenty years of radio observations in five bands (from 4.8 to 37 GHz) of the BL Lac object GC 0109+224 (S2 0109+22, RGB J0112+227), are presented and analysed together with the optical data. Over the past ten years this blazar has…

Astrophysics · Physics 2016-08-16 Stefano Ciprini , Gino Tosti , Harri Teräsranta , Hugh D. Aller

The complex time behaviour of the microquasar GRS 1915+105 in the \rho-class observed with BeppoSAX. III: The hard X-ray delay and limit cycle mapping

The microquasar GRS1915+105 was observed by BeppoSAX in October 2000 for about ten days while the source was in \rho-mode, which is characterized by a quasi-regular type I bursting activity. This paper presents a systematic analysis of the…

High Energy Astrophysical Phenomena · Physics 2013-07-02 F. Massa , E. Massaro , T. Mineo , A. D'Aì , M. Feroci , P. Casella , T. Belloni

The Discovery of gamma-Ray Emission From The Blazar RGB J0710+591

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 telescopes. The observations, taken between 2008 December and 2009…

High Energy Astrophysical Phenomena · Physics 2015-05-18 V. A. Acciari , E. Aliu , T. Arlen , T. Aune , M. Bautista , M. Beilicke , W. Benbow , M. Böttcher , D. Boltuch , S. M. Bradbury , J. H. Buckley , V. Bugaev , K. Byrum , A. Cannon , A. Cesarini , L. Ciupik , W. Cui , R. Dickherber , C. Duke , A. Falcone , J. P. Finley , G. Finnegan , L. Fortson , A. Furniss , N. Galante , D. Gall , K. Gibbs , G. H. Gillanders , S. Godambe , J. Grube , R. Guenette , G. Gyuk , D. Hanna , J. Holder , C. M. Hui , T. B. Humensky , A. Imran , P. Kaaret , N. Karlsson , M. Kertzman , D. Kieda , A. Konopelko , H. Krawczynski , F. Krennrich , M. J. Lang , A. Lamerato , S. LeBohec , G. Maier , S. McArthur , A. McCann , M. McCutcheon , P. Moriarty , R. Mukherjee , R. A. Ong , A. N. Otte , D. Pandel , J. S. Perkins , D. Petry , A. Pichel , M. Pohl , J. Quinn , K. Ragan , L. C. Reyes , P. T. Reynolds , E. Roache , H. J. Rose , P. Roustazadeh , M. Schroedter , G. H. Sembroski , G. Demet Senturk , A. W. Smith , D. Steele , S. P. Swordy , G. Tešić , M. Theiling , S. Thibadeau , A. Varlotta , V. V. Vassiliev , S. Vincent , R. G. Wagner , S. P. Wakely , J. E. Ward , T. C. Weekes , A. Weinstein , T. Weisgarber , D. A. Williams , S. Wissel , M. Wood , B. Zitzer , M. Ackermann , M. Ajello , E. Antolini , L. Baldini , J. Ballet , G. Barbiellini , D. Bastieri , K. Bechtol , R. Bellazzini , B. Berenji , R. D. Blandford , E. D. Bloom , E. Bonamente , A. W. Borgland , A. Bouvier , J. Bregeon , M. Brigida , P. Bruel , R. Buehler , S. Buson , G. A. Caliandro , R. A. Cameron , P. A. Caraveo , S. Carrigan , J. M. Casandjian , E. Cavazzuti , C. Cecchi , Ö. Çelik , E. Charles , A. Chekhtman , C. C. Cheung , J. Chiang , S. Ciprini , R. Claus , J. Cohen-Tanugi , J. Conrad , C. D. Dermer , F. de Palma , E. do Couto e Silva , P. S. Drell , R. Dubois , D. Dumora , C. Farnier , C. Favuzzi , S. J. Fegan , P. Fortin , M. Frailis , Y. Fukazawa , S. Funk , P. Fusco , F. Gargano , D. Gasparrini , N. Gehrels , S. Germani , B. Giebels , N. Giglietto , F. Giordano , M. Giroletti , T. Glanzman , G. Godfrey , I. A. Grenier , J. E. Grove , S. Guiriec , E. Hays , D. Horan , R. E. Hughes , G. Jóhannesson , A. S. Johnson , W. N. Johnson , T. Kamae , H. Katagiri , J. Kataoka , J. Knödlseder , M. Kuss , J. Lande , L. Latronico , S. -H. Lee , M. Llena Garde , F. Longo , F. Loparco , B. Lott , M. N. Lovellette , P. Lubrano , A. Makeev , M. N. Mazziotta , P. F. Michelson , W. Mitthumsiri , T. Mizuno , A. A. Moiseev , C. Monte , M. E. Monzani , A. Morselli , I. V. Moskalenko , S. Murgia , P. L. Nolan , J. P. Norris , E. Nuss , M. Ohno , T. Ohsugi , N. Omodei , E. Orlando , J. F. Ormes , D. Paneque , J. H. Panetta , V. Pelassa , M. Pepe , M. Pesce-Rollins , F. Piron , T. A. Porter , S. Rainò , R. Rando , M. Razzano , A. Reimer , O. Reimer , J. Ripken , A. Y. Rodriguez , M. Roth , H. F. -W. Sadrozinski , D. Sanchez , A. Sander , J. D. Scargle , C. Sgrò , E. J. Siskind , P. D. Smith , G. Spandre , P. Spinelli , M. S. Strickman , D. J. Suson , H. Takahashi , T. Tanaka , J. B. Thayer , J. G. Thayer , D. J. Thompson , L. Tibaldo , D. F. Torres , G. Tosti , A. Tramacere , T. L. Usher , V. Vasileiou , N. Vilchez , V. Vitale , A. P. Waite , P. Wang , B. L. Winer , K. S. Wood , Z. Yang , T. Ylinen , M. Ziegler

A Monitoring Campaign for Luhman 16AB. I. Detection of Resolved Near-Infrared Spectroscopic Variability

[abbreviated] We report resolved near-infrared spectroscopic monitoring of the nearby L dwarf/T dwarf binary WISE J104915.57-531906.1AB (Luhman 16AB), as part of a broader campaign to characterize the spectral energy distribution and…

Solar and Stellar Astrophysics · Physics 2015-06-18 Adam J. Burgasser , Michael Gillon , Jacqueline K. Faherty , Jacqueline Radigan , Amaury H. M. J. , Peter Plavchan , Rachel Street , E. Jehin , L. Delrez , C. Opitom

News from a Multi-Wavelength Monitoring Campaign on Mrk 421

We conducted a daily monitoring campaign on Mrk 421 in 2003 and 2004 with the Whipple 10 m telescope and the large-area instruments aboard RXTE, simultaneously covering TeV and X-ray energies. Supporting observations at optical and radio…

Astrophysics · Physics 2019-08-14 Wei Cui

SMBH binary candidate PKS J2134-0153: Possible multi-band periodic variability and inter-band time lags

Studying the periodic flux-variation behavior of blazars is vital for probing supermassive black hole binaries and the kinematics of relativistic jets. In this work, we report the detection of the multi-band possible periodic variations of…

High Energy Astrophysical Phenomena · Physics 2024-11-12 Guowei Ren , Mouyuan Sun , Nan Ding , Xing Yang , Zhixiang Zhang

Optical Monitoring of BL Lacertae Object OJ 287: a 40-Day Period?

We present the results of our optical monitoring of the BL Lacertae object OJ 287 during the first half of 2005. The source did not show large-amplitude variations during this period and was in a relatively quiescent state. A possible…

Astrophysics · Physics 2008-11-26 Jianghua Wu , Xu Zhou , Xuebing Wu , Fukun Liu , Bo Peng , Jun Ma , Zhenyu Wu , Zhaoji Jiang , Jiansheng Chen

High optical to X-ray polarization ratio reveals Compton scattering in BL Lacertae's jet

Blazars, supermassive black hole systems (SMBHs) with highly relativistic jets aligned with the line of sight, are the most powerful long-lived emitters of electromagnetic emission in the Universe. We report here on a radio to gamma-ray…

High Energy Astrophysical Phenomena · Physics 2025-05-06 Ivan Agudo , Ioannis Liodakis , Jorge Otero-Santos , Riccardo Middei , Alan Marscher , Svetlana Jorstad , Haocheng Zhang , Hui Li , Laura Di Gesu , Roger W. Romani , Dawoon E. Kim , Francesco Fenu , Herman L. Marshall , Luigi Pacciani , Juan Escudero Pedrosa , Francisco Jose Aceituno , Beatriz Agis-Gonzalez , Giacomo Bonnoli , Victor Casanova , Daniel Morcuende , Vilppu Piirola , Alfredo Sota , Pouya M. Kouch , Elina Lindfors , Callum McCall , Helen E. Jermak , Iain A. Steele , George A. Borman , Tatiana S. Grishina , Vladimir A. Hagen-Thorn , Evgenia N. Kopatskaya , Elena G. Larionova , Daria A. Morozova , Sergey S. Savchenko , Ekaterina V. Shishkina , Ivan S. Troitskiy , Yulia V. Troitskaya , Andrey A. Vasilyev , Alexey V. Zhovtan , Ioannis Myserlis , Mark Gurwell , Garrett Keating , Ramprasad Rao , Sincheol Kang , Sang-Sung Lee , Sanghyun Kim , Whee Yeon Cheong , Hyeon-Woo Jeong , Emmanouil Angelakis , Alexander Kraus , Dmitry Blinov , Siddharth Maharana , Rumen Bachev , Jenni Jormanainen , Kari Nilsson , Vandad Fallah Ramazani , Carolina Casadio , Antonio Fuentes , Efthalia Traianou , Clemens Thum , Jose L. Gomez , Lucio Angelo Antonelli , Matteo Bachetti , Luca Baldini , Wayne H. Baumgartner , Ronaldo Bellazzini , Stefano Bianchi , Stephen D. Bongiorno , Raffaella Bonino , Alessandro Brez , Niccolo Bucciantini , Fiamma Capitanio , Simone Castellano , Elisabetta Cavazzuti , Chien-Ting Chen , Stefano Ciprini , Enrico Costa , Alessandra De Rosa , Ettore Del Monte , Niccolo Di Lalla , Alessandro Di Marco , Immacolata Donnarumma , Victor Doroshenko , Michal Dovciak , Steven R. Ehlert , Teruaki Enoto , Yuri Evangelista , Sergio Fabiani , Riccardo Ferrazzoli , Javier A. Garcia , Shuichi Gunji , Kiyoshi Hayashida , Jeremy Heyl , Wataru Iwakiri , Philip Kaaret , Vladimir Karas , Fabian Kislat , Takao Kitaguchi , Jeffery J. Kolodziejczak , Henric Krawczynski , Fabio La Monaca , Luca Latronico , Simone Maldera , Alberto Manfreda , Frederic Marin , Andrea Marinucci , Francesco Massaro , Giorgio Matt , Ikuyuki Mitsuishi , Tsunefumi Mizuno , Fabio Muleri , Michela Negro , Chi-Yung Ng , Stephen L. O'Dell , Nicola Omodei , Chiara Oppedisano , Alessandro Papitto , George G. Pavlov , Abel L. Peirson , Matteo Perri , Melissa Pesce-Rollins , Pierre-Olivier Petrucci , Maura Pilia , Andrea Possenti , Juri Poutanen , Simonetta Puccetti , Brian D. Ramsey , John Rankin , Ajay Ratheesh , Oliver J. Roberts , Carmelo Sgro , Patrick Slane , Paolo Soffitta , Gloria Spandre , Douglas A. Swartz , Toru Tamagawa , Fabrizio Tavecchio , Roberto Taverna , Yuzuru Tawara , Allyn F. Tennant , Nicholas E. Thomas , Francesco Tombesi , Alessio Trois , Sergey S. Tsygankov , Roberto Turolla , Jacco Vink , Martin C. Weisskopf , Kinwah Wu , Fei Xie , Silvia Zane

Long-term variability of radio-bright BL Lacertae objects

Radio-bright BL Lacertae objects (BLOs) are typically variable and exhibit prominent flaring. We use a sample of 24 BLOs to get a clear idea of their flaring behavior and to find possible commonalities in their variability patterns. Our…

Cosmology and Nongalactic Astrophysics · Physics 2014-11-20 E. Nieppola , T. Hovatta , M. Tornikoski , E. Valtaoja , M. F. Aller , H. D. Aller

A wiggling filamentary jet at the origin of the blazar multi-wavelength behaviour

Blazars are beamed active galactic nuclei known for their strong multi-wavelength variability on timescales from years down to minutes. We aim to investigate the suitability of the twisting jet model presented in previous works to explain…

High Energy Astrophysical Phenomena · Physics 2024-12-03 C. M. Raiteri , M. Villata , M. I. Carnerero , S. O. Kurtanidze , D. O. Mirzaqulov , E. Benítez , G. Bonnoli , D. Carosati , J. A. Acosta-Pulido , I. Agudo , T. S. Andreeva , G. Apolonio , R. Bachev , G. A. Borman , V. Bozhilov , L. F. Brown , W. Carbonell , C. Casadio , W. P. Chen , G. Damljanovic , S. A. Ehgamberdiev , D. Elsaesser , J. Escudero , M. Feige , A. Fuentes , D. Gabellini , K. Gazeas , M. Giroletti , T. S. Grishina , A. C. Gupta , M. A. Gurwell , V. A. Hagen-Thorn , G. M. Hamed , D. Hiriart , M. Hodges , R. Z. ivanidze , D. V. Ivanov , M. D. Joner , S. G. Jorstad , M. D. Jovanovic , S. Kiehlmann , G. N. Kimeridze , E. N. Kopatskaya , Yu. A. Kovalev , Y. Y. Kovalev , O. M. Kurtanidze , A. Kurtenkov , E. G. Larionova , A. Lessing , H. C. Lin , J. M. López , C. Lorey , J. Ludwig , N. Marchili , A. Marchini , A. P. Marscher , K. Matsumoto , W. Max-Moerbeck , B. Mihov , M. Minev , M. G. Mingaliev , A. Modaressi , D. A. Morozova , F. Mortari , T. V. Mufakharov , I. Myserlis , M. G. Nikolashvili , T. J. Pearson , A. V. Popkov , I. A. Rahimov , A. C. S. Readhead , D. Reinhart , R. Reeves , S. Righini , F. D. Romanov , S. S. Savchenko , E. Semkov , E. V. Shishkina , L. A. Sigua , L. Slavcheva-Mihova , Yu. V. Sotnikova , R. Steineke , M. Stojanovic , A. Strigachev , A. Takey , E. Traianou , Yu. V. Troitskaya , I. S. Troitskiy , A. L. Tsai , A. Valcheva , A. A. Vasilyev , G. Verna , O. Vince , K. Vrontaki , Z. R. Weaver , J. Webb , Q. X. Yuldoshev , E. Zaharieva , A. V. Zhovtan

Study of the Largest Multiwavelength Campaign of the Microquasar GRS 1915+105

We present the results from a multiwavelength campaign of GRS 1915+105 performed from 2000 April 16 to 25. This is one of the largest coordinated set of observations ever performed for this source, covering the wide energy band in radio…

Astrophysics · Physics 2009-11-07 Y. Ueda , K. Yamaoka , C. Sanchez-Fernandez , V. Dhawan , S. Chaty , J. E. Grove , M. McCollough , A. J. Castro-Tirado , F. Mirabel , K. Kohno , M. Feroci , P. Casella , S. A. Trushkin , H. Castaneda , J. Rodriguez , P. Durouchoux , K. Ebisawa , T. Kotani , J. Swank , H. Inoue

Short term optical variability in broad absorption line QSOs

We present the first results from a pilot programme to monitor the short term optical variability in Broad Absorption Line system QSOs. Intra-night optical variations of ~5% were detected on time scales of ~ one hour in QSOs 0846+156 and…

Astrophysics · Physics 2009-10-30 G. C. Anupama , Arati Chokshi

ROSAT Observations of BL Lacertae Objects

We present soft X-ray spectra of 74 BL Lacertae objects observed with the PSPC detector on board of the ROSAT satellite. The sample contains all BL Lac objects detected during the pointed observation phase as a target or serendipitously. We…

Astrophysics · Physics 2007-05-23 G. Lamer , H. Brunner , R. Staubert

A multifrequency analysis of radio variability of blazars

We have carried out a multifrequency analysis of the radio variability of blazars, exploiting the data obtained during the extensive monitoring programs carried out at the University of Michigan Radio Astronomy Observatory (UMRAO, at 4.8,…

Astrophysics · Physics 2009-11-10 A. Ciaramella , C. Bongardo , H. D. Aller , M. F. Aller , G. De Zotti , A. Lahteenmaki , G. Longo , L. Milano , R. Tagliaferri , H. Terasranta , M. Tornikoski , S. Urpo

Rapid Variability of Mrk 421 During Extreme Flaring as Seen Through the Eyes of XMM-Newton

By studying the variability of blazars across the electromagnetic spectrum, it is possible to resolve the underlying processes responsible for rapid flux increases, so-called flares. We report on an extremely bright X-ray flare in the…

High Energy Astrophysical Phenomena · Physics 2024-03-01 A. Gokus , J. Wilms , M. Kadler , D. Dorner , M. A. Nowak , A. Kreikenbohm , K. Leiter , T. Bretz , B. Schleicher , A. G. Markowitz , K. Pottschmidt , K. Mannheim , I. Kreykenbohm , M. Langejahn , F. McBride , T. Beuchert , T. Dauser , M. Kreter , J. Abhir , D. Baack , M. Balbo , A. Biland , K. Brand , J. Buss , L. Eisenberger , D. Elsaesser , P. Guenther , D. Hildebrand , M. Linhoff , A. Paravac , W. Rhode , V. Sliusar , S. Hasan , R. Walter

Radio Luminosities and Classificatory Criteria of BL Lacertae Objects

Using the sample of radio selected BL Lacertae objects (RBLs) and X-ray selected BL Lacertae objects (XBLs) presented by Sambruna et al. (1996), we calculated the luminosities of radio, optical and X-ray of each source and made the…

Astrophysics · Physics 2009-11-07 D. C. Mei , L. Zhang , Z. J. Jiang , B. Z. Dai

Simultaneous X-ray and optical observations of S5 0716+714 after the outburst of March 2004

At the end of March 2004, the blazar S5 0716+714 underwent an optical outburst that prompted for quasi-simultaneous target-of-opportunity observations with the INTEGRAL and XMM-Newton satellites. In this paper, we report the results of the…

Astrophysics · Physics 2009-11-11 L. Foschini , G. Tagliaferri , E. Pian , G. Ghisellini , A. Treves , L. Maraschi , F. Tavecchio , G. Di Cocco , S. R. Rosen

INTEGRAL observations of the blazar Mrk 421 in outburst (Results of a multi-wavelength campaign)

We report the results of a multi-wavelength campaign on the blazar Mrk 421 during outburst. We observed four strong flares at X-ray energies that were not seen at other wavelengths (partially because of missing data). From the fastest rise…

Astrophysics · Physics 2009-11-13 G. G. Lichti , E. Bottacini , M. Ajello , P. Charlot , W. Collmar , A. Falcone , D. Horan , S. Huber , A. von Kienlin , A. Lähteenmäki , E. Lindfors , D. Morris , K. Nilsson , D. Petry , M. Rüger , A. Sillanpää , F. Spanier , M. Tornikoski