GRB 050904

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GRB 050904
Other designationsGRB 050904
Event typeGamma-ray burst Edit this on Wikidata
Date4 September 2005 Edit this on Wikidata
InstrumentNeil Gehrels Swift Observatory Edit this on Wikidata
ConstellationPisces Edit this on Wikidata
Redshift6.295 ±0.001, 6.295 ±0.002 Edit this on Wikidata

GRB 050904 is one of the most distant events ever observed, as of 2005. This gamma ray burst (GRB) occurred in the constellation Pisces. The bright γ-ray flash, lasting about 200 seconds, was detected on September 4, 2005 by the Swift Gamma-Ray Burst Mission. The GRB has a redshift of z=6.295. Such a high redshift means that the burst happened nearly 13 billion years ago. Therefore, the GRB exploded when the Universe was an infant (890 million years old according to the most recent estimates), about 6% of its current age. By comparison, the most distant galaxy and the most distant quasar ever observed, as of 2005, had a redshift of 6.96 and 6.43, respectively.

Three different groups of researchers, led by Giancarlo Cusumano, Joshua Haislip, and Nobuyuki Kawai respectively, carried out the investigation of the phenomenon and presented their results in Nature magazine on March 9, 2006.

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Preceded by
GRB 000131
Most distant gamma-ray burst
2005 — 2008
Succeeded by
GRB 080913