Using generalized extreme value fits to 30-day maxima from Fermi-GBM and BATSE, the fluence and peak flux of GRB 221009A are extreme outliers, with median return periods of about 1000 years and 140 years respectively.
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Extreme value distribution for gamma-ray-burst prompt data -- How unexpected was the BOAT event?
Using generalized extreme value fits to 30-day maxima from Fermi-GBM and BATSE, the fluence and peak flux of GRB 221009A are extreme outliers, with median return periods of about 1000 years and 140 years respectively.