DISCOVERY OF A GIANT Lyα EMITTER NEAR THE REIONIZATION EPOCH by Ouchi, M, Ono, Y, Egami, E, Saito, T, Oguri, M, McCarthy, P, Farrah, D, Kashikawa, N, Momcheva, I, Shimasaku, K, Nakanishi, K, Furusawa, H, Akiyama, M, Dunlop, J, Mortier, A, Okamura, S, Hayashi, M, Cirasuolo, M, Dressler, A, Iye, M, Jarvis, M, Kodama, T, Martin, C, McLure, R, Ohta, K