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Discovery of very high energy gamma-rays from Markarian 180 triggered by an optical outburst

By Albert J, Aliu E, Anderhub H, Antoranz P, Armada A, Asensio M, Baixeras C, Barrio JA, Bartko H, Bastieri D, Becker J, Bednarek W, Berger K, Bigongiari C, Biland A, Bisesi E, Bock RK, Bordas P, Bosch-Ramon V, Bretz T, Britvitch I, Camara M, Carmona E, Chilingarian A, Ciprini S, Coarasa JA, Commichau S, Contreras JL, Cortina J, Curtef V, Danielyan V, Dazzi F, De Angelis A, de los Reyes R, De Lotto B, Domingo-Santamaria E, Dorner D, Doro M, Errando M, Fagiolini M, Ferenc D, Fernandez E, Firpo R, Flix J, Fonseca MV, Font L, Fuchs M, Galante N, Garczarczyk M, Gaug M, Giller M, Goebel F, Hakobyan D, Hayashida M, Hengstebeck T, Hohne D, Hose J, Hsu CC, Jacon P, Kalekin O, Kosyra R, Kranich D, Laatiaoui M, Laille A, Lenisa T, Liebing P, Lindfors E, Lombardi S, Longo F, Lopez J, Lopez M, Lorenz E, Majumdar P, Maneva G, Mannheim K, Mansutti O, Mariotti M, Martinez M, Mazin D, Merck C, Meucci M, Meyer M, Miranda JM, Mirzoyan R, Mizobuchi S, Moralejo A, Nilsson K, Ninkovic J, Ona-Wilhelmi E, Orduna R, Otte N, Oya I, Paneque D, Paoletti R, Paredes JM, Pasanen M, Pascoli D, Pauss F, Pegna R, Persic M, Peruzzo L, Piccioli A, Poller M, Prandini E, Raymers A, Rhode W, Ribo M, Rico J, Riegel B, Rissi M, Robert A, Rugamer S, Saggion A, Sanchez A, Sartori P, Scalzotto V, Scapin V, Schmitt R, Schweizer T, Shayduk M, Shinozaki K, Shore SN, Sidro N, Sillanpaa A, Sobczynska D, Stamerra A, Stark LS, Takalo L, Temnikov P, Tescaro D, Teshima M, Tonello N, Torres A, Torres DF, Turini N, Vankov H, Vitale V, Wagner RM, Wibig T, Wittek W, Zanin R and Zapatero J

Abstract

The high-frequency-peaked BL Lacertae object Markarian 180 (Mrk 180) was observed to have an optical outburst in 2006 March, triggering a Target of Opportunity observation with the MAGIC telescope. The source was observed for 12.4 hr, and very high energy gamma-ray emission was detected with a significance of 5.5 sigma. An integral flux above 200 GeV of (2.3 +/- 0.7) x 10(-11) cm(-2) s(-1) was measured, corresponding to 11% of the Crab Nebula flux. A rather soft spectrum with a photon index of has been determined. No significant flux -3.3 x 0.7 variation was found

Publisher: 'University of Chicago Press'
Year: 2006
DOI identifier: 10.1086/508020
OAI identifier: oai:air.uniud.it:11390/878853
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