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About

A. A. Henden is a leading figure in high-energy astrophysics, best known for pioneering studies of gamma-ray bursts (GRBs) and their afterglows. Their key research areas include ultra-long GRBs, multi-wavelength transient phenomena, and the physics of relativistic jets. Henden’s most notable contribution is the comprehensive analysis of GRB 091024A, a landmark event that redefined our understanding of burst duration extremes. Their 2013 paper, cited over 90 times, provided the first broadband study of this ultra-long GRB, demonstrating that prompt emission can persist for ~1300 seconds—far exceeding typical bursts—while revealing bright, structured optical emission. This work fundamentally challenged existing progenitor models and established ultra-long GRBs as a distinct class. Beyond this, Henden has shaped the field through collaborative efforts with Swift, Fermi, and Konus-Wind missions, advancing techniques for rapid multi-wavelength follow-up. Their research continues to influence how astronomers classify and interpret the most extreme explosive events in the universe, making their work essential reading for students and researchers studying transient astrophysics and the death of massive stars.