Pre-burst events of gamma-ray bursts with light speed variation

Previous researches on high-energy photon events from gamma-ray bursts (GRBs) suggest a light speed variation v(E) = c(1 - E/E-LV) with E-LV = 3.6 x 10(17) GeV, together with a pre-burst scenario that hight-energy photons come out about 10 seconds earlier than low-energy photons at the GRB source. However, in the Lorentz invariance violating scenario with an energy dependent light speed considered here, high-energy photons travel slower than low-energy photons due to the light speed variation, so that they are usually detected after low-energy photons in observed GRB data. Here we find four high-energy photon events which were observed earlier than low-energy photons from Fermi Gamma-ray Space Telescope (FGST), and analysis on these photon events supports the pre-burst scenario of high energy photons from GRBs and the energy dependence of light speed listed above. (C) 2021 The Author(s). Published by Elsevier B.V.

Automated summary

Previous studies have shown that high-energy photons appear earlier than low-energy photons at the source of GRBs, but in the scenario of energy-dependent light speed variation, high-energy photons travel slower than low-energy photons and are typically detected later. Recent research analyzing high-energy photon events observed earlier than low-energy photons from FGST supports the pre-burst scenario of high-energy photons from GRBs and the energy dependence of light speed.