The gamma-ray burst GRB 090423 was detected coming from the most distant astronomical object of any kind known at the time.

Gamma-ray burst

Flash of gamma rays from a distant galaxy

In gamma-ray astronomy, gamma-ray bursts (GRBs) are extremely energetic events occurring in distant galaxies which represent the brightest and most powerful class of explosion in the universe. These extreme electromagnetic emissions are second only to the Big Bang as the most…

GRB 090423

Very distant gamma-ray burst detected in 2009

GRB 090423 was a gamma-ray burst (GRB) detected by the Swift Gamma-Ray Burst Mission on April 23, 2009, at 07:55:19 UTC whose afterglow was detected in the infrared and enabled astronomers to determine that its redshift is z = 8.2, making it one of the most distant objects…

List of the most distant astronomical objects

This article documents the most distant astronomical objects discovered and verified so far, and the time periods in which they were so classified.