GRB 090426: the environment of a rest-frame 0.35-s gamma-ray burst at a redshift of 2.609 by Levesque, E, Bloom, J, Butler, N, Perley, D, Cenko, S, Prochaska, J, Kewley, L, Bunker, A, Chen, H, Chornock, R, Filippenko, A, Glazebrook, K, Lopez, S, Masiero, J, Modjaz, M, Morgan, A, Poznanski, D