GRB 011211

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 elements. This was the first detection of these elements in the spectrum of a GRB.^[5] These observations provided strong evidence for a relation between gamma-ray bursts and supernova.^[3] However, other astronomers pointed out flaws in the methodology of the Leicester research team, such as the data reduction methods,^[6] the low statistical significance of the emission lines,^[7] and the low spectral resolution of the instrument used.^[8] Despite a follow-up paper from the Leicester team to address these concerns,^[9] the findings remained controversial, and GRB 020813 was given the distinction of being the first burst with direct evidence of a supernova relation.^[10][11]

Optical, infrared, and X-ray observations taken by the Hubble Space Telescope between 14 and 59 days after the burst's detection revealed a blue galaxy with an apparent magnitude of 24.95 ± 0.11.^[12] Like several other gamma-ray burst hosts, Lyman alpha emission was detected from this galaxy, supporting the theory that the progenitors of gamma-ray burst tend to be metal-poor.^[13]