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O'Connor, Brendan; Troja, Eleonora; Ryan, Geoffrey; Beniamini, Paz; van Eerten, Hendrik; Granot, Jonathan; Dichiara, Simone; Ricci, Roberto; Lipunov, Vladimir; Gillanders, James H; Gill, Ramandeep; Moss, Michael; Anand, Shreya; Andreoni, Igor; Becerra, Rosa L; Buckley, David A H; Butler, Nathaniel R; Cenko, Stephen B; Chasovnikov, Aristarkh; Durbak, Joseph; Francile, Carlos; Hammerstein, Erica; van der Horst, Alexander J; Kasliwal, Mansi M; Kouveliotou, Chryssa; Kutyrev, Alexander S; Lee, William H; Srinivasaragavan, Gokul P; Topolev, Vladislav; Watson, Alan M; Yang, Yuhan; Zhirkov, Kirill
Science advances, 2023-Jun-09, Volume: 9, Issue: 23Journal Article
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 ( ≈ 10 erg) and proximity ( ≈ 0.15), GRB 221009A is an exceptionally rare event that pushes the limits of our theories. We present multiwavelength observations covering the first 3 months of its afterglow evolution. The x-ray brightness decays as a power law with slope ≈ , which is not consistent with standard predictions for jetted emission. We attribute this behavior to a shallow energy profile of the relativistic jet. A similar trend is observed in other energetic GRBs, suggesting that the most extreme explosions may be powered by structured jets launched by a common central engine.
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