VERITAS Observations of a Very High Energy Gamma-ray Flare from the Blazar 3C 66A

Details VERITAS Observations of a Very High Energy Gamma-ray Flare from the Blazar 3C 66A VERITAS Observations of a Very High Energy Gamma-ray Flare from the Blazar 3C 66A

2009-01-28

arxiv.org/abs/0901.4527v2

Astrophys.J.693:L104-L108,2009

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

13 Pages, 4 Figures. Published in ApJL. This new version correctly calculates the intrinsic photon index (see Erratum: ApJL, 7

Scientific paper

10.1088/0004-637X/693/2/L104

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 hours live time). The observed integral flux above 200 GeV is 6% of the Crab Nebula's flux and shows evidence for variability on the time-scale 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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