GRB 011211

GRB 011211 was a gamma-ray burst (GRB) detected on December 11, 2001. A gamma-ray burst is a highly luminous flash associated with an explosion in a distant galaxy and producing gamma rays, the most energetic form of electromagnetic radiation, and often followed by a longer-lived "afterglow" emitted at longer wavelengths (X-ray, ultraviolet, optical, infrared, and radio).
Observations
GRB 011211 was detected by the Italian–Dutch X-ray astronomy satellite BeppoSAX on 11 December 2001 at 19:09 UTC. The burst lasted 270 seconds, making it the longest burst that had ever been detected by BeppoSAX up to that point. A spectrum recorded by the Yepun telescope indicated a redshift of z = 2.14.
Supernova relation
A team of researchers at the University of Leicester conducted an analysis of the burst's X-ray afterglow with the XMM-Newton observatory. They found evidence for emission lines of magnesium, silicon, sulphur, and various other chemical...