This is a false-color Hubble Space Telescope image of the visible fireball which accompanied the gamma ray burst called GRB 970228. This is the first optical image ever taken which associates a gamma-ray burst source with a potential host galaxy. This observation provides strong supporting evidence that gamma-ray bursts are cosmological - they originate in distant galaxies across the universe.

Credit: K. Sahu, M. Livio, L. Petro, D. Macchetto, STScI and NASA/ESA