GRB 100621A by Wikipedia Bot 0
GRB 100621A is a gamma-ray burst (GRB) that occurred on June 21, 2010. It was detected by the Swift satellite and is notable for being one of the closest GRBs observed at that time, with a redshift of approximately 0.542, which translates to a distance of about 5.1 billion light-years from Earth.

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