A γ-ray burst at a redshift of z ≈ 8.2

  title={A $\gamma$-ray burst at a redshift of z ≈ 8.2},
  author={Nial R. Tanvir and Derek B. Fox and Andrew J. Levan and Edo Berger and Klaas Wiersema and Johan P. U. Fynbo and A. Cucchiara and T. Kr{\"u}hler and Neil A. Gehrels and Joshua S. Bloom and J. Greiner and P. A. Evans and Evert Rol and Felipe Olivares and Jens Hjorth and P. Jakobsson and Jay Farihi and Richard Willingale and Rhaana L. C. Starling and S. Bradley Cenko and Daniel A. Perley and Justyn R. Maund and J. Duke and Ralph Wijers and A J Adamson and Alasdair Allan and Malcolm N. Bremer and David N. Burrows and Alberto J. Castro-Tirado and Brad Cavanagh and Antonio de Ugarte Postigo and Michael A. Dopita and Timur A. Fatkhullin and A. S. Fruchter and Ryan J. Foley and Javier Gorosabel and Jamie A. Kennea and Tom H. Kerr and S. Klose and H A Krimm and V. N. Komarova and Shrinivas R. Kulkarni and Alexander Moskvitin and C. G. Mundell and Tim Naylor and Kim L. Page and Bryan Edward Penprase and Matteo Perri and Philipp Podsiadlowski and Katherine C. Roth and Robert E. Rutledge and Takanori Sakamoto and Patricia Schady and B P Schmidt and Alicia Margarita Soderberg and Jesper Sollerman and A. W. Stephens and G. Stratta and Tilan N. Ukwatta and David G. Watson and E. Westra and Truman Wold and Christian Wolf},
Long-duration γ-ray bursts (GRBs) are thought to result from the explosions of certain massive stars, and some are bright enough that they should be observable out to redshifts of z > 20 using current technology. Hitherto, the highest redshift measured for any object was z = 6.96, for a Lyman-α emitting galaxy. Here we report that GRB 090423 lies at a redshift of z ≈ 8.2, implying that massive stars were being produced and dying as GRBs ∼630 Myr after the Big Bang. The burst also pinpoints the… 

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