Off-Axis Gamma-Ray Burst Produces Dazzling Afterglow, Revealing Powerful Stellar Jet

A recent cosmic explosion has puzzled astronomers: a modest gamma-ray flash was followed by one of the brightest afterglows observed in two decades. New findings suggest the reason is Earth's viewing angle. The event, a gamma-ray burst (GRB), occurred when a massive star collapsed, launching a powerful jet. We were not looking directly down the jet's core, so the initial gamma rays appeared faint. However, the afterglow, produced as the jet slammed into surrounding gas, shone brightly across the electromagnetic spectrum. Observations from multiple telescopes allowed scientists to reconstruct the jet's structure and estimate its true energy. This discovery highlights how off-axis GRBs can be hidden in gamma rays yet brilliant in afterglow, impacting estimates of GRB rates and their role in the universe. Future wide-field surveys may uncover more such events, refining our understanding of stellar deaths and jet physics.