2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/196019We show that the recent measurements of linear polarization in gamma rays from GRB 930131 and GRB 960924 constrain certain types of relativity violations in photons to less than parts in 10^{37}, representing an improvement in sensitivity by a factor of 100,000.10 pagesHigh Energy Physics - PhenomenologyAstrophysicsGeneral Relativity and Quantum Cosmologytext