GRB 100621A

GRB 100621A stands for Gamma-Ray Burst 100621A. Gamma-Ray Bursts are huge bursts of energy that come from space, like a bright flash of light. When GRB 100621A happened, it was so bright that it was seen here on Earth. Scientists discovered information about GRB 100621A and are still trying to learn more about it. Watching GRB 100621A was special because it was the longest Gamma-Ray Burst that had been seen up till that time - it lasted for about 40 seconds.