GRB 090423 at a redshift of z ≈ 8.1

@article{Salvaterra2009GRB0A,
  title={GRB 090423 at a redshift of z ≈ 8.1},
  author={Ruben Salvaterra and Massimo Della Valle and Massimo Della Valle and Sergio Campana and Guido L. Chincarini and Guido L. Chincarini and Stefano Covino and Paolo D’Avanzo and Paolo D’Avanzo and Alberto Fern{\'a}ndez-Soto and Cristiano Guidorzi and Filippo Mannucci and Raffaella Margutti and Raffaella Margutti and Christina C. Th{\"o}ne and Louis Antonelli and Scott Douglas Barthelmy and Massimiliano De Pasquale and Valerio D’Elia and Fabrizio Fiore and Dino Fugazza and Leslie K. Hunt and Elisabetta Maiorano and S. Marinoni and F. E. Marshall and Emilio Molinari and J. A. Nousek and Elena Pian and Judith L. Racusin and Luigi Stella and Lorenzo Amati and Gloria Andreuzzi and Giancarlo Cusumano and Edward E. Fenimore and Patrizia Ferrero and Paolo Giommi and Dafne Guetta and Stephen T. Holland and Stephen T. Holland and Kevin Hurley and G. L. Israel and Jirong Mao and Craig B. Markwardt 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},
  journal={Nature},
  year={2009},
  volume={461},
  pages={1258-1260},
  url={https://api.semanticscholar.org/CorpusID:205218263}
}
Observations of GRB 090423 and the near-infrared spectroscopic measurement of its redshift are reported, suggesting that the mechanisms and progenitors that gave rise to this burst about 600,000,000 years after the Big Bang are not markedly different from those producing GRBs about 10, thousands of years later.
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