NASA's Fermi Space Telescope Detects Longest-Recorded Gamma-Ray Burst

NASA's Fermi Gamma-ray Space Telescope detected an unprecedented gamma-ray burst (GRB) on July 2, 2025.The event, dubbed GRB 250702B, lasted for seven hours and emitted bursts every few seconds.This is the longest GRB ever recorded, and its origin remains a mystery despite extensive observations with ground-based telescopes such as the Gemini telescopes in Chile and Hawaii, the Very Large Telescope in Chile, the Keck Observatory in Hawaii, and the Hubble Space Telescope.