23.11.2001 13:17 |
A New Ultrahigh-Energy Gamma-Ray Source The active galactic nucleus BL Lac was observed with the Gt-48 atmospheric
Cherenkov detector of the Crimean Astrophysical Observatory from July
23-September 1, 1998, in order to search for ultrahigh-energy gamma-ray (>1
TeV) emission. The object was in the field of view of the detector for more
than 24 hours. The source was detected with a high level of confidence (7.2
sigma), with a flux equal to (2.1+/-0.4)x10^{-11} photons cm^{-2}s^{-1}.
http://arXiv.org/abs/astro-ph/0111448
Yu. I. Neshpor, N. N. Chalenko, A. A. Stepanian, O. R. Kalekin, N. A. Jogolev, V. P. Fomin, and V. G. Shitov
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