GRB 090423 at a redshift of z ≈ 8.1

  title={GRB 090423 at a redshift of z ≈ 8.1},
  author={Ruben Salvaterra and Massimo Della Valle and Sergio Campana and Guido L. Chincarini and Stefano Covino and Paolo D’Avanzo and Alberto Fern{\'a}ndez-Soto and Cristiano Guidorzi and Filippo Mannucci and Raffaella Margutti and Christina C. Th{\"o}ne and Lucio Angelo Antonelli and Scott Douglas Barthelmy and Massimiliano de Pasquale and V. D’Elia and Fabrizio Fiore and Dino Fugazza and Leslie K. Hunt and E Maiorano and S. Marinoni and F. E. Marshall and Emilio Molinari and J A Nousek and E. Pian and Judith L. Racusin and Luigi Stella and Lorenzo Amati and Gloria Andreuzzi and G Cusumano and Edward E. Fenimore and Patrizia Ferrero and Paolo Giommi and Dafne Guetta and Simon Holland and K Hurley and Gian Luca Israel and Jirong Mao and Craig B. Markwardt and Nicola Masetti and Claudio Pagani and Eliana Palazzi and David M. Palmer and Silvia Piranomonte and Gianpiero Tagliaferri and Vincenzo Testa},
Gamma-ray bursts (GRBs) are produced by rare types of massive stellar explosion. Their rapidly fading afterglows are often bright enough at optical wavelengths that they are detectable at cosmological distances. Hitherto, the highest known redshift for a GRB was z = 6.7 (ref. 1), for GRB 080913, and for a galaxy was z = 6.96 (ref. 2). Here we report observations of GRB 090423 and the near-infrared spectroscopic measurement of its redshift, z = . This burst happened when the Universe was only… 

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