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Acciari, VA,Aliu, E,Arlen, T,Beilicke, M,Benbow, W,Bottcher, M,Bradbury, SM,Buckley, JH,Bugaev, V,Butt, Y,Byrum, K,Cannon, A,Celik, O,Cesarini, A,Chow, YC,Ciupik, L,Cogan, P,Cui, W,Daniel, MK,Dickherber, R,Ergin, T,Falcone, A,Fegan, SJ,Finley, JP,Fortin, P,Fortson, L,Furniss, A,Gall, D,Gibbs, K,Gillanders, GH,Godambe, S,Grube, J,Guenette, R,Gyuk, G,Hanna, D,Hays, E,Holder, J,Horan, D,Hui, CM,Humensky, TB,Imran, A,Kaaret, P,Karlsson, N,Kertzman, M,Kieda, D,Kildea, J,Konopelko, A,Krawczynski, H,Krennrich, F,Lang, MJ,LeBohec, S,Maier, G,McCann, A,McCutcheon, M,Millis, J,Moriarty, P,Mukherjee, R,Nagai, T,Ong, RA,Otte, N,Pandel, D,Perkins, JS,Petry, D,Pizlo, F,Pohl, M,Quinn, J,Ragan, K,Reyes, LC,Reynolds, T,Roache, E,Rose, HJ,Schroedter, M,Sembroski, GH,Smith, AW,Steele, D,Swordy, SP,Theiling,
2009
March
Astrophysical Journal Letters
VERITAS OBSERVATIONS OF A VERY HIGH ENERGY gamma-RAY FLARE FROM THE BLAZAR 3C 66A
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()
Optional Fields
BL Lacertae objects: individual (3C 66A) galaxies: active gamma rays: observations BL LACERTAE OBJECTS ATMOSPHERIC CHERENKOV TELESCOPES X-RAY EMISSION 3C-66A DISCOVERY RADIATION ASTRONOMY OPACITY ARRAY
693
104
108
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.
DOI 10.1088/0004-637X/693/2/L104
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