A few minutes after the BOAT erupted, Fermi's Gamma-ray Burst Monitor recorded an unusual energy peak that caught our attention. When I first saw that signal, it gave me goosebumps. Our analysis since then shows it to be the first high-confidence emission line ever seen in 50 years of studying GRBs.
But now, the researchers say they've found a hidden peak of energy in the GRB's initial burst. It appeared about five minutes in, lasted around 40 seconds, and in that short period reached an astonishing energy peak of around 12 million electron volts.
According to the researcher's findings, it's overwhelmingly likely that it was produced by the annihilation of matter and antimatter.
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