The explosion that looked ordinary was hiding a cannon: a cosmic afterglow in the brightest 1%

The gamma-ray burst GRB 260310A, detected by NASA's Fermi telescope on 10 March 2026, looked modest at first — a 53-second flash, nothing exceptional. Then its afterglow refused to behave: within hours it outshone its entire host galaxy, ranked among the brightest 1% of visible and X-ray afterglows ever compared, and brightened again weeks later. An international team led from the University of Rome Tor Vergata now thinks it knows why: the explosion's most powerful jet was aimed away from Earth, and we were watching it from the side. Their findings, in The Astrophysical Journal Letters, turn a puzzling event into a rare sideways view of how massive stars die — and a reminder that the universe's quiet-looking events are not always quiet.