Presentation #101A.01 in the session GRB 221009a.
At 13:16:59.99 UT on October 9th, 2022, the Fermi Gamma-ray Burst Monitor (GBM) triggered on gamma-ray burst (GRB) 221009A. This GRB has the highest fluence value GBM has ever detected. The light curve consists of two distinct emission episodes, a single isolated peak followed by a longer, extremely bright, multi-pulsed event. The two main peaks of the second event, from T0+218 to T0+276 seconds and T0+508 to T0+513 seconds, had such high photon rates they saturated the GBM detectors. Emission from the GRB is detected out to T0+1467 seconds when the field of view was occulted by Earth. Here we present a full spectrotemporal analysis of this historically bright event and its impact on GRB science.