MULTI-WAVELENGTH OBSERVATIONS OF THE FLARING GAMMA-RAY BLAZAR 3C 66A IN 2008 OCTOBER

A A Abdo,E Angelakis,A Konopelko,P Fusco,S Mcarthur,J E Ward,T Hovatta,N Giglietto,R Rando,T Kamae,F De Palma,M Kuss,L Costamante,T Belloni,E Cavazzuti,M Dolci,M N Mazziotta,E Orlando,J X Prochaska,J E Grove,T J Johnson,N Karlsson,A Furniss,C M Hui,M G Nikolashvili,H Ungerechts,E Koptelova,R A Cameron,J Cohen-Tanugi,R Mukherjee,S J Fegan,J B Thayer,R Dickherber,S Buson,D Da Rio,M S Strickman,A Sillanää,E Nuss,D Dumora,H Krawczynski,C Sgrò,C M Raiteri,R A Ong,J M Casandjian,E Forné,A P Waite,J S Perkins,K Nilsson,D Bastieri,F Piron,I Agudo,I A Grenier,A Reimer,C Trigilio,D A Williams,A Morselli,C D Dermer,J Chiang,T A Porter,S W Digel,J A Zensus,J Ripken,F Krennrich,B Lott,E Roache,M Ajello,I Nestoras,A S Johnson,M Beilicke,R Itoh,Z Yang,O M Kurtanidze,T Glanzman,J Dashti,P Moriarty,D Kieda,J Conrad,M Errando,E Hays,P A Caraveo,A Sievers,M F Aller,J Quinn,M Razzano,J L Christiansen,A Mccann,N Vilchez,J P Finley,L Fortson,V M Larionov,R Bellazzini,P S Drell,A Halkola,T Arlen,S Rainò,C Favuzzi,D Carosati,T Weisgarber,P Beltrame,M Böttcher,V V Vassiliev,F Longo,D Pandel,L Fuhrmann,J Heidt,S M Bradbury,M A Gurwell,D Gasparrini,F Loparco,D Boltuch,V A Hagen-Thorn,K Ragan,A Tramacere,G Gyuk,V Vasileiou,P Spinelli,S Cutini,S Murgia,L Guillemot,J Knödlseder,G Barbiellini,D Capezzali,U Bach,M Sorcia,A Okumura,L Latronico,L Tibaldo,V Vitale,S Thibadeau,R E Hughes,C Diltz,J Bregeon,E Charles,S P Wakely,B L Winer,F Gargano,E Do Couto E Silva,H Takahashi,T Ylinen,J F Ormes,F Giordano,E Lindfors,Ö Çelik,J Vandenbroucke,J Kataoka,P Fortin,M Giroletti,R D Blandford,P Kaaret,P Roustazadeh,S Vincent,A N Otte,L O Takalo,G Godfrey,C Cecchi,A Lähteenmäki,G N Kimeridze,G A Caliandro,V Bugaev,J Holder,V Pelassa,A Chekhtman,S Ritz,L Ciupik,M Theiling,G Finnegan,M E Monzani,N Palma,D Hiriart,A C Sadun,A Bouvier,S Godambe,M N Lovellette,S Carrigan,M Pasanen,I V Moskalenko,P T Reynolds,T Aune,J E Mcenery,M Frailis,D Hanna,M Kertzman,S Wissel,S Lebohec,W Benbow,D J Thompson,W P Chen,R Ligustri,K Bechtol,A Makeev,G H Gillanders,C Monte,P Lubrano,R Turchetti,J Ballet,A Falcone,G Tagliaferri,H Katagiri,M S Shaw,D Hadasch,J P Norris,K Byrum,J H Buckley,D J Suson,A Sander,J Grube,L A Sigua,M J Lang,G H Sembroski,P F Michelson,D Gall,A Cesarini,M Ziegler,A W Smith,P D Smith,T Ohsugi,H J Rose,D Parent,M Pesce-Rollins,R Bachev,N Omodei,T B Humensky,G Umana,M Roth,S Germani,S.-H Lee,A W Borgland,A Berduygin,M Schroedter,V A Acciari,E Aliu,D Horan,N Gehrels,M Hauser,S Funk,D Dultzin,R Claus,S Ciprini,M Hayashida,P Wang,D Steele,M Villata,A Cannon,S Guiriec,S P Swordy,P Calcidese,N Galante,M Tornikoski,J Saino,P Leto,P Giommi,W N Johnson,D F Torres,C S Buemi,E Bonamente,Y Fukazawa,A Pichel,E N Kopatskaya,A Brez,M Brigida,D Paneque,R Dubois,P L Nolan,G Spandre,G Tosti,M Mccutcheon,A Varlotta,T C Weekes,G Maier,T Mizuno,E Benítez,R Buehler,C C Cheung,H D Aller,M Ackermann,M Wood,D Riquelme,B Berenji,J Panetta ,R Mújica ,Takaaki Tanaka ,H Y Hsiao ,Javier Ros ,Cullen H Blake ,Michele Fumagalli ,J López ,D Starr ,G D Şentürk ,G Tešić ,Andrea Paola ,J Landé ,А А Архаров ,Svetlana G Jorstad ,M Naumann-Godó ,R Guénette ,K Wood ,I De La Calle Pérez ,Luis Reyes ,Wei Cui ,S J Wagner ,Luca Baldini ,J Méhault ,David Davis ,Masanobu Ozaki ,А А Моисеев ,Alan P Marscher ,José L Gómez ,Martin Pohl ,Jeffrey D Scargle ,M Pepé ,Roger W Romani ,J Bloom ,Т С Константинова ,Michael Mommert ,A J.r Weinstein ,Pascal Bruel ,David Sánchez ,Mar Roca-Sogorb ,Asif Imran ,Takeshi Nakamori ,G Jøhannesson ,H F-W Sadrozinski ,T Usher

doi:10.1088/0004-637x/726/1/43

Abstract

The BL Lacertae object 3C 66A was detected in a flaring state by the Fermi Large Area Telescope (LAT) and VERITAS in 2008 October. In addition to these gamma-ray observations, F-GAMMA, GASP-WEBT, PAIRITEL, MDM, ATOM, Swift, and Chandra provided radio to X-ray coverage. The available light curves show variability and, in particular, correlated flares are observed in the optical and Fermi-LAT gamma-ray band. The resulting spectral energy distribution can be well fit using standard leptonic models with and without an external radiation field for inverse-Compton scattering. It is found, however, that only the model with an external radiation field can accommodate the intra-night variability observed at optical wavelengths.

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