Fifty years ago, on June 1, 1973, astronomers around the world were introduced to a powerful and perplexing new phenomenon called gamma-ray bursts, now seen somewhere in the sky about once a day on average. Astronomers think the bursts arise from catastrophic occurrences involving stars in distant galaxies, events thought to produce new black holes
Click here for original story, NASA Looks Back at 50 Years of Gamma-Ray Burst Science
Source: NASA Goddard Center