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Title: GRB 050904 at red shift 6.3: Observations of the oldest cosmic explosion after the Big Bang
Authors: Tagliaferri, G.
Chincarini, G.
D'Avanzo, P.
Campana, S.
Covino, S.
Fugazza, D.
Moretti, A.
Romano, P.
Antonelli, L. A.
Grazian, A.
Testa, V.
Fiore, F.
Stella, L.
Conciatore, M. L.
D'Elia, V.
Guetta, D.
Israel, G. L.
Melandri, A.
Piranomonte, S.
Chincarini, G.
Fernández-Soto, A.
Malesani, D.
Della Valle M
D'Avanzo, P.
Castro-Tirado, A. J.
Gorosabel, J.
Guziy, S.
Jelínek, M.
Moles, M.
De Ugarte Postigo A
Burrows, D. N.
Nousek, J.
Capalbi, M.
Cusumano, G.
Filliatre, P.
Goldoni, P.
Filliatre, P.
Goldoni, P.
Gehrels, N.
Held, E. V.
Hurley, K.
Lazzati, D.
Perna, R.
López-Echarri, A.
Melandri, A.
Mirabel, I. F.
Mason, K. O.
Osborne, J.
Pellizza, L. J.
Piro, L.
First Published: Nov-2005
Publisher: EDP Sciences for European Southern Observatory (ESO)
Citation: Astronomy & Astrophysics, 2005, 443 (1)
Abstract: We present optical and near-infrared observations of the afterglow of the gamma-ray burst GRB 050904. We derive a photometric redshift z = 6.3, estimated from the presence of the Lyman break falling between the I and J filters. This is by far the most distant GRB known to date. Its isotropic-equivalent energy is $3.4 \times 10^{53}$ erg in the rest-frame 110-1100 keV energy band. Despite the high redshift, both the prompt and the afterglow emission are not peculiar with respect to other GRBs. We find a break in the J-band light curve at $t_{\rm b} = 2.6 \pm 1.0$ d (observer frame). If we assume this is the jet break, we derive a beaming-corrected energy $E_\gamma \sim (4 \div 12) \times 10^{51}$ erg. This limit shows that GRB 050904 is consistent with the Amati and Ghirlanda relations. This detection is consistent with the expected number of GRBs at z > 6 and shows that GRBs are a powerful tool to study the star formation history up to very high redshift.
DOI Link: 10.1051/0004-6361:200500196
ISSN: 0004-6361
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2005 ESO. Reproduced with permission from Astronomy & Astrophysics, © ESO.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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