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

@article{Tanvir2009AB, title={A γ-ray burst at a redshift of z ≈ 8.2}, author={N. Tanvir and D. Fox and A. Levan and E. Berger and K. Wiersema and J. Fynbo and A. Cucchiara and T. Kr{\"u}hler and N. Gehrels and J. Bloom and J. Greiner and P. Evans and E. Rol and F. Olivares and J. Hjorth and P. Jakobsson and J. Farihi and R. Willingale and R. Starling and S. Cenko and D. Perley and J. Maund and J. Duke and R. Wijers and A. Adamson and A. Allan and M. Bremer and D. Burrows and A. Castro-Tirado and B. Cavanagh and A. U. Postigo and M. Dopita and T. Fatkhullin and A. Fruchter and R. Foley and J. Gorosabel and J. Kennea and T. Kerr and S. Klose and H. Krimm and V. Komarova and S. Kulkarni and A. Moskvitin and C. Mundell and T. Naylor and K. Page and B. Penprase and M. Perri and P. Podsiadlowski and K. Roth and R. Rutledge and T. Sakamoto and P. Schady and B. Schmidt and A. Soderberg and J. Sollerman and A. Stephens and G. Stratta and T. Ukwatta and D. Watson and E. Westra and T. Wold and C. Wolf}, journal={Nature}, year={2009}, volume={461}, pages={1254-1257} }

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… Expand

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