Comment on

• Gamma-ray bursts: huge explosion in the early Universe.

  Cusumano G, Mangano V, Chincarini G, Panaitescu A, Burrows DN, La Parola V, Sakamoto T, Campana S, Mineo T, Tagliaferri G, Angelini L, Barthelemy SD, Beardmore AP, Boyd PT, Cominsky LR, Gronwall C, Fenimore EE, Gehrels N, Giommi P, Goad M, Hurley K, Kennea JA, Mason KO, Marshall F, Mészáros P, Nousek JA, Osborne JP, Palmer DM, Roming PW, Wells A, White NE, Zhang B. Cusumano G, et al. Nature. 2006 Mar 9;440(7081):164. doi: 10.1038/440164a. Nature. 2006. PMID: 16525462
• A photometric redshift of z = 6.39 +/- 0.12 for GRB 050904.

  Haislip JB, Nysewander MC, Reichart DE, Levan A, Tanvir N, Cenko SB, Fox DB, Price PA, Castro-Tirado AJ, Gorosabel J, Evans CR, Figueredo E, MacLeod CL, Kirschbrown JR, Jelinek M, Guziy S, de Ugarte Postigo A, Cypriano ES, LaCluyze A, Graham J, Priddey R, Chapman R, Rhoads J, Fruchter AS, Lamb DQ, Kouveliotou C, Wijers RA, Bayliss MB, Schmidt BP, Soderberg AM, Kulkarni SR, Harrison FA, Moon DS, Gal-Yam A, Kasliwal MM, Hudec R, Vitek S, Kubanek P, Crain JA, Foster AC, Clemens JC, Bartelme JW, Canterna R, Hartmann DH, Henden AA, Klose S, Park HS, Williams GG, Rol E, O'Brien P, Bersier D, Prada F, Pizarro S, Maturana D, Ugarte P, Alvarez A, Fernandez AJ, Jarvis MJ, Moles M, Alfaro E, Ivarsen KM, Kumar ND, Mack CE, Zdarowicz CM, Gehrels N, Barthelmy S, Burrows DN. Haislip JB, et al. Nature. 2006 Mar 9;440(7081):181-3. doi: 10.1038/nature04552. Nature. 2006. PMID: 16525465
• An optical spectrum of the afterglow of a gamma-ray burst at a redshift of z = 6.295.

  Kawai N, Kosugi G, Aoki K, Yamada T, Totani T, Ohta K, Iye M, Hattori T, Aoki W, Furusawa H, Hurley K, Kawabata KS, Kobayashi N, Komiyama Y, Mizumoto Y, Nomoto K, Noumaru J, Ogasawara R, Sato R, Sekiguchi K, Shirasaki Y, Suzuki M, Takata T, Tamagawa T, Terada H, Watanabe J, Yatsu Y, Yoshida A. Kawai N, et al. Nature. 2006 Mar 9;440(7081):184-6. doi: 10.1038/nature04498. Nature. 2006. PMID: 16525466