Abstract
We examine gamma‐ray and optical data of GRB 091024, a gamma‐ray burst (GRB) with an extremely long duration of T90≈1020 s, as observed with the Fermi Gamma‐Ray Burst Monitor (GBM). We present spectral analysis of all three distinct emission episodes using data from Fermi/GBM. and compare the optical and gamma‐ray light curves of this event. We find that the optical light curve is highly anti‐correlated to the prompt gamma‐ray emission, with the optical emission reaching the maximum during an epoch of quiescence in the prompt emission. We interpret this behavior as the reverse shock (optical flash).
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