Detection of 2 MeV spectral bump and ~40 MeV emission line from GRB 221009A

Zhi-Qiang Ding, Zhenxia Zhang, Yanqiu Zhang +47

Gamma-ray bursts (GRBs) are the most energetic transients in the Universe, but prompt MeV--sub-GeV observations remain challenging with current gamma-ray observatories. Here, using…