On January 14, 2019, the Major Atmospheric Gamma Imaging Cherenkov telescopes detected GRB 190114C above 0.2 TeV, recording the most energetic photons ever observed from a gamma-ray burst. We use this unique observation to probe an energy dependence of the speed of light in vacuo for photons as predicted by several quantum gravity models. Based on a set of assumptions on the possible intrinsic spectral and temporal evolution, we obtain competitive lower limits on the quadratic leading order of speed of light modification.
Physical Review Letters
- Pub Date:
- July 2020
- Astrophysics - High Energy Astrophysical Phenomena
- 8 pages, 5 figures, Published in Physical Review Letters, Corresponding authors: Tomislav Terzi\'c (email@example.com), Giacomo D'Amico (firstname.lastname@example.org), Daniel Kerszberg (email@example.com), Cedric Perennes (firstname.lastname@example.org)