The Bright and the Slow -- GRBs 100724B \& 160509A with high-energy cutoffs at $\lesssim 100$MeV

G. Vianello, R. Gill, J. Granot +3

We analyze the prompt emission of GRB 100724B and GRB 160509A, two of the brightest Gamma-Ray Bursts (GRBs) observed by Fermi at $\lesssim \mathrm{MeV}$ energies but surprisingly faint…