A reported 300-TeV signal from a gamma-ray burst’s direction raises a physics puzzle

An astronomy post describes a photon-like signal with an estimated energy of about 300 TeV, recorded from the direction of GRB 221009A. It says a photon that energetic should have been absorbed during a journey from roughly 2 billion light-years away. The post says researchers have proposed conversion into a hypothetical axion-like particle, potentially alongside a tiny violation of Lorentz invariance, as an explanation. The event’s connection to the burst needs stronger confirmation.