VERITAS OBSERVATIONS OF A VERY HIGH ENERGY gamma-RAY FLARE FROM THE BLAZAR 3C 66A
- Acciari, V. A.
- Aliu, E.
- Arlen, T.
- Beilicke, M.
- Benbow, W.
- Boettcher, M.
- Bradbury, S. M.
- Buckley, J. H.
- Bugaev, V.
- Butt, Y.
- Byrum, K.
- Cannon, A.
- Celik, O.
- Cesarini, A.
- Chow, Y. C.
- Ciupik, L.
- Cogan, P.
- Cui, W.
- Daniel, M. K.
- Dickherber, R.
- Ergin, Tülün
- Falcone, A.
- Fegan, S. J.
- Finley, J. P.
- Fortin, P.
- Fortson, L.
- Furniss, A.
- Gall, D.
- Gibbs, K.
- Gillanders, G. H.
- Godambe, S.
- Grube, J.
- Guenette, R.
- Gyuk, G.
- Hanna, D.
- Hays, E.
- Holder, J.
- Horan, D.
- Hui, C. M.
- Humensky, T. B.
- Imran, A.
- Kaaret, P.
- Karlsson, N.
- Kertzman, M.
- Kieda, D.
- Kildea, J.
- Konopelko, A.
- Krawczynski, H.
- Krennrich, F.
- Lang, M. J.
- LeBohec, S.
- Maier, G.
- McCann, A.
- McCutcheon, M.
- Millis, J.
- Moriarty, P.
- Mukherjee, R.
- Nagai, T.
- Ong, R. A.
- Otte, N.
- Pandel, D.
- Perkins, J. S.
- Petry, D.
- Pizlo, F.
- Pohl, M.
- Quinn, J.
- Ragan, K.
- Reyes, L. C.
- Reynolds, T.
- Roache, E.
- Rose, H. J.
- Schroedter, M.
- Sembroski, G. H.
- Smith, A. W.
- Steele, D.
- Swordy, S. P.
- Theiling, M.
- Toner, J. A.
- Varlotta, A.
- Vassiliev, V. V.
- Wagner, R. G.
- Wakely, S. P.
- Ward, J. E.
- Weekes, T. C.
- Weinstein, A.
- Williams, D. A.
- Wissel, S.
- Wood, M.
- Zitzer, B.
Publication date
March 2009
DOI Publisher
IOP Publishing Journal
The Astrophysical JournalAbstract
The intermediate-frequency peaked BL Lacertae (IBL) object 3C 66A is detected during 2007-2008 in VHE ( very high energy; E > 100 GeV) gamma rays with the VERITAS stereoscopic array of imaging atmospheric Cherenkov telescopes. An excess of 1791 events is detected, corresponding to a significance of 21.2 standard deviations (sigma), in these observations (32.8 hr live time). The observed integral flux above 200 GeV is 6% of the Crab Nebula's flux and shows evidence for variability on the timescale of days. The measured energy spectrum is characterized by a soft power law with photon index Gamma = 4.1 +/- 0.4(stat) +/- 0.6(sys). The radio galaxy 3C 66B is excluded as a possible source of the VHE emission
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