Free Astronomy Magazine September-October 2025

22 SEPTEMBER-OCTOBER 2025 ASTRO PUBLISHING ever recorded. The results were pub- lished by the renowned journal The Astrophysical Journal Letters (ApJ Letters). The publication presents in- depth observations conducted in 2022 with the Large-Sized Telescope (LST) prototype, the LST-1, during its commissioning phase at the Roque de los Muchachos Observa- tory (ORM) on the CTAO-North site in La Palma (Canary Islands, Spain). The observations revealed a hint of an excess in the gamma-ray flux, which help provide new insights T he international CTAO LST Col- laboration, in which the Insti- tuto de Astrofísica de Canarias (IAC) plays a prominent role, re- leased remarkable findings from observations of GRB 221009A—the brightest gamma-ray burst (GRB) New clues about gamma-ray bursts jets by IAC Ramón García López Alicia López Oramas Juan Cortina