From what i have read the gamma ray frequency cap ranges from 3×10^19 to 3×10^24. I wanna know what you guys have heard it is. Are the highest measured gamma ray from a supernova calculated with any time dialated effects? Also what is the thoertical cap of something higher than a gamma ray, what i mean are there any theories saying the limit to the energy a photon can have will be greater if something smaller than a photon is emitted (or thought to possibly exist with an explosion of that size)? P.S. I know of wikipedia so citing it isnt very helpful, please try to refrain.