Brightest gamma-rayburst ever observed reveals new mysteries of cosmic explosions AAS_Office arxiv
from GRB 221009A lasted over 300 seconds. Astronomers think that such"long-duration" GRBs are the birth cry of a black hole, formed as the core of a massive and rapidly spinning star collapses under its own weight. The newborn black hole launches powerful jets ofat near the speed of light, which pierce through the collapsing star and shine in gamma-rays.
"This burst, being so bright, provided a unique opportunity to explore the detailed behavior and evolution of an afterglow with unprecedented detail—we did not want to miss it," says Edo Berger, professor of astronomy at Harvard University and the CfA."I have been studying these events for more than twenty years, and this one was as exciting as the first GRB I ever observed."
"This is one of the most detailed datasets we have ever collected, and it is clear that the millimeter and radio data just don't behave as expected," says CfA research associate Yvette Cendes."A few GRBs in the past have shown a brief excess of millimeter and radio emission that is thought to be the signature of a shockwave in the jet itself, but in GRB 221009A the excess emission behaves quite differently than in these past cases.
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