An Interpretation of the Evidence for Tev Emission from Gamma-ray Burst 970417a

The Milagrito collaboration recently reported evidence for emission of very high energy gamma-rays in the TeV range from one of the BATSE GRBs, GRB 970417a. Here I discuss possible interpretations of this result. Taking into account the intergalactic absorption of TeV gamma-rays by the cosmic infrared background, I found that the detection rate (one per 54 GRBs observed by the Milagrito) and energy fluence can be consistently explained with the redshift of this GRB at z ∼ 0.7 and the isotropic total energy in the TeV range, ETeV,iso ∼ 10 54 erg. This energy scale is not unreasonably large, but interestingly similar to the maximum total GRB energy observed to date, in the sub-MeV range for GRB 990123. On the other hand, the energy emitted in the ordinary sub-MeV range becomes EMeV,iso ∼ 10 51 erg for the GRB 970417a, which is much smaller than the total energy in the TeV range by a factor of about 10. I show that the proton-synchrotron model of GRBs provides a possible explanation for these observational results. I also discuss some observational signatures expected in the future experiments from this model. Subject headings: acceleration of particles — cosmic rays — diffuse radiation — galaxies: evolution — gamma-rays: bursts — gamma-rays: theory