Related papers: Twelve-hour spikes from the Crab Pevatron

Gamma-ray flares from the Crab Nebula

A young and energetic pulsar powers the well-known Crab Nebula. Here we describe two separate gamma-ray (photon energy >100 MeV) flares from this source detected by the Large Area Telescope on board the Fermi Gamma-ray Space Telescope. The…

High Energy Astrophysical Phenomena · Physics 2011-01-11 LAT Collaboration

Gamma-ray Activity in the Crab Nebula: The Exceptional Flare of April 2011

The Large Area Telescope on board the Fermi satellite observed a gamma-ray flare in the Crab nebula lasting for approximately nine days in April of 2011. The source, which at optical wavelengths has a size of ~11 ly across, doubled its…

High Energy Astrophysical Phenomena · Physics 2015-06-03 R. Buehler , J. D. Scargle , R. D. Blandford , L. Baldini , M. G. Baring , A. Belfiore , E. Charles , J. Chiang , F. D'Ammando , C. D. Dermer , S. Funk , J. E. Grove , A. K. Harding , E. Hays , M. Kerr , F. Massaro , M. N. Mazziotta , R. W. Romani , P. M. Saz Parkinson , A. F. Tennant , M. C. Weisskopf

Variable gamma-ray emission from the Crab Nebula: short flares and long "waves"

Gamma-ray emission from the Crab Nebula has been recently shown to be unsteady. In this paper, we study the flux and spectral variability of the Crab above 100 MeV on different timescales ranging from days to weeks. In addition to the four…

High Energy Astrophysical Phenomena · Physics 2013-02-19 E. Striani , M. Tavani , V. Vittorini , I. Donnarumma , A. Giuliani , G. Pucella , A. Argan , A. Bulgarelli , S. Colafrancesco , M. Cardillo , E. Costa , E. Del Monte , A. Ferrari , S. Mereghetti , L. Pacciani , A. Pellizzoni , G. Piano , C. Pittori , M. Rapisarda , S. Sabatini , P. Soffitta , M. Trifoglio , A. Trois , S. Vercellone , F. Verrecchia

A systematic study of $\gamma$-ray flares from the Crab Nebula with Fermi-LAT: I. flare detection

Significant flares of GeV $\gamma$-ray emission from the Crab Nebula have been found by AGILE and Fermi-LAT years ago, indicating that extreme particle acceleration and radiation occurs in young pulsar wind nebulae. To enlarge the flare…

High Energy Astrophysical Phenomena · Physics 2021-02-24 Xiaoyuan Huang , Qiang Yuan , Yi-Zhong Fan

The Surprising Crab Nebula

We will present our study of the flux and spectral variability of the Crab above 100 MeV on different timescales ranging from days to weeks. In addition to the four main intense and day-long flares detected by AGILE and Fermi-LAT between…

High Energy Astrophysical Phenomena · Physics 2013-03-12 E. Striani , M. Tavani , V. Vittorini

Gamma-ray flux depressions of the Crab nebula in the high-energy range

The giant gamma-ray flares of the Crab nebula discovered by AGILE and Fermi observatories came as a surprise and have challenged the existing models of pulsar wind nebulae. We have carried out an analysis of 10.5 years of Fermi-LAT…

High Energy Astrophysical Phenomena · Physics 2020-11-23 M. S. Pshirkov , B. A. Nizamov , A. M. Bykov , Yu. A. Uvarov

Spectral Evolution of the September 2010 gamma-ray flare from the Crab Nebula (V2)

Strong gamma-ray flares from the Crab Nebula have been recently discovered by AGILE and confirmed by Fermi-LAT. We study here the spectral evolution in the gamma-ray energy range above 50 MeV of the September 2010 flare that was…

High Energy Astrophysical Phenomena · Physics 2015-05-27 V. Vittorini , M. Tavani , G. Pucella , I. Donnarumma

The Crab Nebula super-flare in April 2011: extremely fast particle acceleration and gamma-ray emission

We report on the extremely intense and fast gamma-ray are above 100 MeV detected by AGILE from the Crab Nebula in mid-April 2011. This event is the fourth of a sequence of reported major gamma-ray flares produced by the Crab Nebula in the…

High Energy Astrophysical Phenomena · Physics 2015-05-28 E. Striani , M. Tavani , G. Piano , I. Donnarumma , G. Pucella , V. Vittorini , A. Bulgarelli , A. Trois , C. Pittori , F. Verrecchia , E. Costa , M. Weisskopf , A. Tennant , A. Argan , G. Barbiellini , P. Caraveo , M Cardillo , P. W. Cattaneo , A. W. Chen , G. De Paris , E. Del Monte , G. Di Cocco , Y. Evangelista , A. Ferrari , M. Feroci , F. Fuschino , M. Galli , F. Gianotti , A. Giuliani , C. Labanti , I. Lapshov , F. Lazzarotto , F. Longo , M. Marisaldi , S. Mereghetti , A. Morselli , L. Pacciani , A. Pellizzoni , F. Perotti , P. Picozza , M. Pilia , M. Rapisarda , A. Rappoldi , S. Sabatini , P. Soffitta , M. Trifoglio , S. Vercellone , F. Lucarelli , P. Santolamazza , P. Giommi

Rapid Gamma-ray flux variability during the 2013 March Crab Nebula flare

We report on a bright flare in the Crab Nebula detected by the Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope. The period of significantly increased luminosity occurred in 2013 March and lasted for approximately 2…

High Energy Astrophysical Phenomena · Physics 2013-09-13 M. Mayer , R. Buehler , E. Hays , M. Dutka , C. C. Cheung , M. S. Dutka , J. E. Grove , M. Kerr , R. Ojha

A statistical model to explain the gamma-ray variability and flares of the Crab nebula

Recently the AGILE and Fermi/LAT detectors uncovered giant $\gamma$-ray flares from the Crab nebula. The duration of these flares is a few days. The Fermi/LAT data with monthly time binning further showed significant variability of the…

High Energy Astrophysical Phenomena · Physics 2015-05-30 Qiang Yuan , Peng-Fei Yin , Xue-Feng Wu , Xiao-Jun Bi , Siming Liu , Bing Zhang

MAXI GSC monitoring of the Crab nebula and pulsar during the GeV gamma-ray flare in September 2010

We report on the MAXI GSC X-ray monitoring of the Crab nebula and pulsar during the GeV gamma-ray flare for the period of 2010 September 18-24 (MJD 55457-55463) detected by AGILE and Fermi-LAT. There were no significant variations on the…

High Energy Astrophysical Phenomena · Physics 2015-05-28 Mikio Morii , Mutsumi Sugizaki , Nobuyuki Kawai , Motoko Serino , Takayuki Yamamoto , Ryuichi Usui , Arata Daikyuji , Ken Ebisawa , Satoshi Eguchi , Kazuo Hiroi , Masaki Ishikawa , Naoki Isobe , Kazuyoshi Kawasaki , Masashi Kimura , Hiroki Kitayama , Mitsuhiro Kohama , Takanori Matsumura , Masaru Matsuoka , Tatehiro Mihara , Yujin E. Nakagawa , Satoshi Nakahira , Motoki Nakajima , Hitoshi Negoro , Hiroshi Ozawa , Megumi Shidatsu , Tetsuya Sootome , Kousuke Sugimori , Fumitoshi Suwa , Hiroshi Tomida , Yohko Tsuboi , Hiroshi Tsunemi , Yoshihiro Ueda , Shiro Ueno , Akiko Uzawa , Kazutaka Yamaoka , Kyohei Yamazaki , Atsumasa Yoshida

Peta-electron volt gamma-ray emission from the Crab Nebula

The Crab pulsar and the surrounding nebula powered by the pulsar's rotational energy through the formation and termination of a relativistic electron-positron wind is a bright source of gamma-rays carrying crucial information about this…

High Energy Astrophysical Phenomena · Physics 2021-11-15 The LHAASO Collaboration , Zhen Cao , F. Aharonian , Q. An , Axikegu , L. X. Bai , Y. X. Bai , Y. W. Bao , D. Bastieri , X. J. Bi , Y. J. Bi , H. Cai , J. T. Cai , Zhe Cao , J. Chang , J. F. Chang , B. M. Chen , E. S. Chen , J. Chen , Liang Chen , Liang Chen , Long Chen , M. J. Chen , M. L. Chen , Q. H. Chen , S. H. Chen , S. Z. Chen , T. L. Chen , X. L. Chen , Y. Chen , N. Cheng , Y. D. Cheng , S. W. Cui , X. H. Cui , Y. D. Cui , B. D'Ettorre Piazzoli , B. Z. Dai , H. L. Dai , Z. G. Dai , Danzengluobu , D. della Volpe , X. J. Dong , K. K. Duan , J. H. Fan , Y. Z. Fan , Z. X. Fan , J. Fang , K. Fang , C. F. Feng , L. Feng , S. H. Feng , Y. L. Feng , B. Gao , C. D. Gao , L. Q. Gao , Q. Gao , W. Gao , M. M. Ge , L. S. Geng , G. H. Gong , Q. B. Gou , M. H. Gu , F. L. Guo , J. G. Guo , X. L. Guo , Y. Q. Guo , Y. Y. Guo , Y. A. Han , H. H. He , H. N. He , J. C. He , S. L. He , X. B. He , Y. He , M. Heller , Y. K. Hor , C. Hou , X. Hou , H. B. Hu , S. Hu , S. C. Hu , X. J. Hu , D. H. Huang , Q. L. Huang , W. H. Huang , X. T. Huang , X. Y. Huang , Z. C. Huang , F. Ji , X. L. Ji , H. Y. Jia , K. Jiang , Z. J. Jiang , C. Jin , T. Ke , D. Kuleshov , K. Levochkin , B. B. Li , Cheng Li , Cong Li , F. Li , H. B. Li , H. C. Li , H. Y. Li , Jie Li , Jian Li , K. Li , W. L. Li , X. R. Li , Xin Li , Xin Li , Y. Li , Y. Z. Li , Zhe Li , Zhuo Li , E. W. Liang , Y. F. Liang , S. J. Lin , B. Liu , C. Liu , D. Liu , H. Liu , H. D. Liu , J. Liu , J. L. Liu , J. S. Liu , J. Y. Liu , M. Y. Liu , R. Y. Liu , S. M. Liu , W. Liu , Y. Liu , Y. N. Liu , Z. X. Liu , W. J. Long , R. Lu , H. K. Lv , B. Q. Ma , L. L. Ma , X. H. Ma , J. R. Mao , A. Masood , Z. Min , W. Mitthumsiri , T. Montaruli , Y. C. Nan , B. Y. Pang , P. Pattarakijwanich , Z. Y. Pei , M. Y. Qi , Y. Q. Qi , B. Q. Qiao , J. J. Qin , D. Ruffolo , V. Rulev , A. Sáiz , L. Shao , O. Shchegolev , X. D. Sheng , J. Y. Shi , H. C. Song , Yu. V. Stenkin , V. Stepanov , Y. Su , Q. N. Sun , X. N. Sun , Z. B. Sun , P. H. T. Tam , Z. B. Tang , W. W. Tian , B. D. Wang , C. Wang , H. Wang , H. G. Wang , J. C. Wang , J. S. Wang , L. P. Wang , L. Y. Wang , R. N. Wang , Wei Wang , Wei Wang , X. G. Wang , X. J. Wang , X. Y. Wang , Y. Wang , Y. D. Wang , Y. J. Wang , Y. P. Wang , Z. H. Wang , Z. X. Wang , Zhen Wang , Zheng Wang , D. M. Wei , J. J. Wei , Y. J. Wei , T. Wen , C. Y. Wu , H. R. Wu , S. Wu , W. X. Wu , X. F. Wu , S. Q. Xi , J. Xia , J. J. Xia , G. M. Xiang , D. X. Xiao , G. Xiao , H. B. Xiao , G. G. Xin , Y. L. Xin , Y. Xing , D. L. Xu , R. X. Xu , L. Xue , D. H. Yan , J. Z. Yan , C. W. Yang , F. F. Yang , J. Y. Yang , L. L. Yang , M. J. Yang , R. Z. Yang , S. B. Yang , Y. H. Yao , Z. G. Yao , Y. M. Ye , L. Q. Yin , N. Yin , X. H. You , Z. Y. You , Y. H. Yu , Q. Yuan , H. D. Zeng , T. X. Zeng , W. Zeng , Z. K. Zeng , M. Zha , X. X. Zhai , B. B. Zhang , H. M. Zhang , H. Y. Zhang , J. L. Zhang , J. W. Zhang , L. X. Zhang , Li Zhang , Lu Zhang , P. F. Zhang , P. P. Zhang , R. Zhang , S. R. Zhang , S. S. Zhang , X. Zhang , X. P. Zhang , Y. F. Zhang , Y. L. Zhang , Yi Zhang , Yong Zhang , B. Zhao , J. Zhao , L. Zhao , L. Z. Zhao , S. P. Zhao , F. Zheng , Y. Zheng , B. Zhou , H. Zhou , J. N. Zhou , P. Zhou , R. Zhou , X. X. Zhou , C. G. Zhu , F. R. Zhu , H. Zhu , K. J. Zhu , X. Zuo

The variable Crab Nebula

The remarkable Crab Nebula is powered by an energetic pulsar whose relativistic wind interacts with the inner parts of the Supernova Remnant SN1054. Despite low-intensity optical and X-ray variations in the inner Nebula, the Crab has been…

High Energy Astrophysical Phenomena · Physics 2011-06-07 Marco Tavani

Inductive spikes in the Crab Nebula - a theory of gamma-ray flares

We show that the mysterious, rapidly variable emission at ~400 MeV observed from the Crab Nebula by the AGILE and Fermi experiments could be the result of a sudden drop in the mass-loading of the pulsar wind. The current required to…

High Energy Astrophysical Phenomena · Physics 2017-11-29 John G. Kirk , Gwenael Giacinti

H.E.S.S. Observations of the Crab during its March 2013 GeV Gamma-Ray Flare

Context. On March 4, 2013, the Fermi-LAT and AGILE reported a flare from the direction of the Crab Nebula in which the high-energy (HE; E > 100 MeV) flux was six times above its quiescent level. Simultaneous observations in other energy…

High Energy Astrophysical Phenomena · Physics 2014-02-20 H. E. S. S. Collaboration , A. Abramowski , F. Aharonian , F. Ait Benkhali , A. G. Akhperjanian , E. Angüner , G. Anton , S. Balenderan , A. Balzer , A. Barnacka , Y. Becherini , J. Becker Tjus , K. Bernlöhr , E. Birsin , E. Bissaldi , J. Biteau , M. Böttcher , C. Boisson , J. Bolmont , P. Bordas , J. Brucker , F. Brun , P. Brun , T. Bulik , S. Carrigan , S. Casanova , M. Cerruti , P. M. Chadwick , R. Chalme-Calvet , R. C. G. Chaves , A. Cheesebrough , M. Chrétien , S. Colafrancesco , G. Cologna , J. Conrad , C. Couturier , Y. Cui , M. Dalton , M. K. Daniel , I. D. Davids , B. Degrange , C. Deil , P. deWilt , H. J. Dickinson , A. Djannati-Ataï , W. Domainko , L. O'C. Drury , G. Dubus , K. Dutson , J. Dyks , M. Dyrda , T. Edwards , K. Egberts , P. Eger , P. Espigat , C. Farnier , S. Fegan , F. Feinstein , M. V. Fernandes , D. Fernandez , A. Fiasson , G. Fontaine , A. Förster , M. Füßling , M. Gajdus , Y. A. Gallant , T. Garrigoux , G. Giavitto , B. Giebels , J. F. Glicenstein , M. -H. Grondin , M. Grudzińska , S. Häffner , J. Hahn , J. Harris , G. Heinzelmann , G. Henri , G. Hermann , O. Hervet , A. Hillert , J. A. Hinton , W. Hofmann , P. Hofverberg , M. Holler , D. Horns , A. Jacholkowska , C. Jahn , M. Jamrozy , M. Janiak , F. Jankowsky , I. Jung , M. A. Kastendieck , K. Katarzyński , U. Katz , S. Kaufmann , B. Khélifi , M. Kieffer , S. Klepser , D. Klochkov , W. Kluźniak , T. Kneiske , D. Kolitzus , Nu. Komin , K. Kosack , S. Krakau , F. Krayzel , P. P. Krüger , H. Laffon , G. Lamanna , J. Lefaucheur , A. Lemière , M. Lemoine-Goumard , J. -P. Lenain , D. Lennarz , T. Lohse , A. Lopatin , C. -C. Lu , V. Marandon , A. Marcowith , R. Marx , G. Maurin , N. Maxted , M. Mayer , T. J. L. McComb , J. Méhault , P. J. Meintjes , U. Menzler , M. Meyer , R. Moderski , M. Mohamed , E. Moulin , T. Murach , C. L. Naumann , M. de Naurois , J. Niemiec , S. J. Nolan , L. Oakes , S. Ohm , E. de Oña Wilhelmi , B. Opitz , M. Ostrowski , I. Oya , M. Panter , R. D. Parsons , M. Paz Arribas , N. W. Pekeur , G. Pelletier , J. Perez , P. -O. Petrucci , B. Peyaud , S. Pita , H. Poon , G. Pühlhofer , M. Punch , A. Quirrenbach , S. Raab , M. Raue , A. Reimer , O. Reimer , M. Renaud , R. de los Reyes , F. Rieger , L. Rob , C. Romoli , S. Rosier-Lees , G. Rowell , B. Rudak , C. B. Rulten , V. Sahakian , D. A. Sanchez , A. Santangelo , R. Schlickeiser , F. Schüssler , A. Schulz , U. Schwanke , S. Schwarzburg , S. Schwemmer , H. Sol , G. Spengler , F. Spies , Ł. Stawarz , R. Steenkamp , C. Stegmann , F. Stinzing , K. Stycz , I. Sushch , A. Szostek , J. -P. Tavernet , T. Tavernier , A. M. Taylor , R. Terrier , M. Tluczykont , C. Trichard , K. Valerius , C. van Eldik , B. van Soelen , G. Vasileiadis , C. Venter , A. Viana , P. Vincent , H. J. Völk , F. Volpe , M. Vorster , T. Vuillaume , S. J. Wagner , P. Wagner , M. Ward , M. Weidinger , Q. Weitzel , R. White , A. Wierzcholska , P. Willmann , A. Wörnlein , D. Wouters , V. Zabalza , M. Zacharias , A. Zajczyk , A. A. Zdziarski , A. Zech , H. -S. Zechlin

Discovery of Powerful Gamma-Ray Flares from the Crab Nebula

The well known Crab Nebula is at the center of the SN1054 supernova remnant. It consists of a rotationally-powered pulsar interacting with a surrounding nebula through a relativistic particle wind. The emissions originating from the pulsar…

High Energy Astrophysical Phenomena · Physics 2011-01-13 M. Tavani , A. Bulgarelli , V. Vittorini , A. Pellizzoni , E. Striani , P. Caraveo , M. C. Weisskopf , A. Tennant , G. Pucella , A. Trois , E. Costa , Y. Evangelista , C. Pittori , F. Verrecchia , E. Del Monte , R. Campana , M. Pilia , A. De Luca , I. Donnarumma , D. Horns , C. Ferrigno , C. O. Heinke , M. Trifoglio , F. Gianotti , S. Vercellone , A. Argan , G. Barbiellini , P. W. Cattaneo , A. W. Chen , T. Contessi , F. D'Ammando , G. DeParis , G. Di Cocco , G. Di Persio , M. Feroci , A. Ferrari , M. Galli , A. Giuliani , M. Giusti , C. Labanti , I. Lapshov , F. Lazzarotto , P. Lipari , F. Longo , F. Fuschino , M. Marisaldi , S. Mereghetti , E. Morelli , E. Moretti , A. Morselli , L. Pacciani , F. Perotti , G. Piano , P. Picozza , M. Prest , M. Rapisarda , A. Rappoldi , A. Rubini , S. Sabatini , P. Soffitta , E. Vallazza , A. Zambra , D. Zanello , F. Lucarelli , P. Santolamazza , P. Giommi , L. Salotti , G. F. Bignami

A search for enhanced very high energy gamma-ray emission from the March 2013 Crab Nebula flare

In March 2013, a flaring episode from the Crab Nebula lasting ~2 weeks was detected by the Fermi-LAT (Large Area Telescope on board the Fermi Gamma-ray Space Telescope). VERITAS provides simultaneous observations throughout this period.…

High Energy Astrophysical Phenomena · Physics 2014-01-09 The VERITAS Collaboration , E. Aliu , S. Archambault , T. Aune , W. Benbow , K. Berger , R. Bird , A. Bouvier , J. H. Buckley , V. Bugaev , K. Byrum , M. Cerruti , X. Chen , L. Ciupik , M. P. Connolly , W. Cui , J. Dumm , M. Errando , A. Falcone , S. Federici , Q. Feng , J. P. Finley , P. Fortin , L. Fortson , A. Furniss , N. Galante , G. H. Gillanders , S. Griffin , S. T. Griffiths , J. Grube , G. Gyuk , D. Hanna , J. Holder , G. Hughes , T. B. Humensky , P. Kaaret , M. Kertzman , Y. Khassen , D. Kieda , F. Krennrich , S. Kumar , M. J. Lang , M. Lyutikov , G. Maier , S. McArthur , A. McCann , K. Meagher , J. Millis , P. Moriarty , R. Mukherjee , A. O'Faolain de Bhroithe , R. A. Ong , A. N. Otte , J. S. Perkins , M. Pohl , A. Popkow , J. Quinn , K. Ragan , J. Rajotte , L. C. Reyes , P. T. Reynolds , G. T. Richards , E. Roache , G. H. Sembroski , F. Sheidaei , A. W. Smith , D. Staszak , I. Telezhinsky , M. Theiling , J. V. Tucci , J. Tyler , A. Varlotta , S. P. Wakely , T. C. Weekes , A. Weinstein , R. Welsing , D. A. Williams , A. Zajczyk , B. Zitzer

Detection of Small Flares from the Crab Nebula with Fermi-LAT

Gamma radiation from the Crab pulsar wind nebula (PWN) shows significant variability at $\sim100$ MeV energies, recently revealed with spaceborne gamma-ray telescopes. Here we report the results of a systematic search for gamma-ray flares…

High Energy Astrophysical Phenomena · Physics 2020-07-08 Masanori Arakawa , Masaaki Hayashida , Dmitry Khangulyan , Yasunobu Uchiyama

Fermi Large Area Telescope Observations of the Crab Pulsar and Nebula

We report on gamma-ray observations of the Crab Pulsar and Nebula using 8 months of survey data with the Fermi Large Area Telescope (LAT). The high quality light curve obtained using the ephemeris provided by the Nancay and Jodrell Bank…

High Energy Astrophysical Phenomena · Physics 2012-08-27 The Fermi LAT collaboration , the Fermi Pulsar Timing Consortium , : , A. A. Abdo

Gamma-Ray Spectra & Variability of the Crab Nebula Emission Observed by BATSE

We report ~ 600 days of BATSE earth-occultation observations of the total gamma-ray (30 keV to 1.7 MeV) emission from the Crab nebula, between 1991 May 24 (TJD 8400) and 1994 October 2 (TJD 9627). Lightcurves from 35-100, 100-200, 200-300,…

Astrophysics · Physics 2009-11-10 J. C. Ling , Wm. A. Wheaton