Observation of Gamma Rays Greater than 10 TeV from Markarian 421

Okumura, K; Asahara, A; Bicknell, Geoffrey; Edwards, Philip G; Enomoto, R; Gunji, S; Hara, Shinji; Hara, T; Hayashi, Sei; Itoh, Chie; Kabuki, S; Kajino, F; Katagiri, H; Kataoka, J; Kawachi, A; Kifune, Tadashi; Kubo, H; Kushida, J; Maeda, S; Maeshiro, A; Matsubara, Y; Mizumoto, Y; Mori, Masaki; Moriya, Mie; Muraishi, H; Muraki, Y; Naito, T; Nakase, T; Nishijima, K; Ohishi, M; Patterson, Joseph R; Sakurazawa, K; Suzuki, R; Swaby, D L; Takano, K; Takano, T; Tanimori, T; Tokanai, F; Tsuchiya, L; Tsunoo, H; Uruma, K; Watanabe, O; Yanagita, S; Yoshida, T; Yoshikoshi, T

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Observation of Gamma Rays Greater than 10 TeV from Markarian 421

Date

2002

Authors

Okumura, K

Asahara, A

Bicknell, Geoffrey

Edwards, Philip G

Enomoto, R

Gunji, S

Hara, Shinji

Hara, T

Hayashi, Sei

Itoh, Chie

Publisher

IOP Publishing

Abstract

We have observed Markarian 421 in 2001 January and March with the CANGAROO-II imaging Cerenkov telescope during an extraordinarily high state at TeV energies. From 14 hr of observations at very large zenith angles, ∼70°, a signal of 298 ± 52 gamma-ray