GRB 090429B

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GRB 090429B was a gamma-ray burst first detected on 29 April 2009, the second detected that day. Though this burst was detected in 2009, it was not until May 2011 that its distance estimate was announced. The burst had a photometric redshift of z=9.4,[1] which would make it the most distant GRB known,[2] although the error bar on this estimate was large, providing a lower limit of z>7.[1] GRB 090423 remains the most distant object known with spectroscopic confirmation.

On 2009 April 29, a five-second-long burst of gamma rays from the constellation Canes Venatici triggered the Burst Alert Telescope on NASA's Swift satellite.

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