GRB 050904 at redshift 6.3: observations of the oldest cosmic explosion after the Big Bang

  title={GRB 050904 at redshift 6.3: observations of the oldest cosmic explosion after the Big Bang},
  author={Gianpiero Tagliaferri and Lucio Angelo Antonelli and Guido L. Chincarini and Alberto Fern{\'a}ndez-Soto and Daniele B. Malesani and Massimo Della Valle and Paolo D’Avanzo and Andrea Grazian and Vincenzo Testa and Sergio Campana and Stefano Covino and Fr{\'e}d{\'e}ric Di Fiore and Luigi Stella and et. al.},
  journal={Astronomy and Astrophysics},
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 × 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… Expand
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