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A structured jet explains the extreme GRB 221009A

Kouveliotou, Chryssa; Buckley, David A. H.; Hammerstein, Erica +29 more

Long-duration gamma-ray bursts (GRBs) are powerful cosmic explosions, signaling the death of massive stars. Among them, GRB 221009A is by far the brightest burst ever observed. Because of its enormous energy ( E iso ≈ 10 55 erg) and proximity ( z ≈ 0.15), GRB 221009A is an exceptionally rare event that pushes the limits of our theories. We present…

A radio pulsar phase from SGR J1935+2154 provides clues to the magnetar FRB mechanism

Göğüş, Ersin; Li, Di; Zhu, Weiwei +34 more

The megajansky radio burst, FRB 20200428, and other bright radio bursts detected from the Galactic source SGR J1935+2154 suggest that magnetars can make fast radio bursts (FRBs), but the emission site and mechanism of FRB-like bursts are still unidentified. Here, we report the emergence of a radio pulsar phase of the magnetar 5 months after FRB 20…