2000ApJ...536L..23T -
Astrophys. J., 536, L23-L26 (2000/June-2)
An interpretation of the evidence for TeV emission from GRB 970417a.
TOTANI T.
Abstract (from CDS):
The Milagrito collaboration recently reported evidence for emission of very high energy gamma rays in the TeV range from one of the BATSE gamma-ray bursts, 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 gamma-ray bursts [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≳1054 ergs. This energy scale is not unreasonably large, but interestingly similar to the maximum total GRB energy in the sub-MeV range observed to date for GRB 990123. On the other hand, the energy emitted in the ordinary sub-MeV range becomes EMeV,iso∼1051 ergs for GRB 970417a, which is much smaller than the total energy in the TeV range by a factor of about 103. 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 future experiments from this model.
Abstract Copyright:
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Journal keyword(s):
Acceleration of Particles - ISM: Cosmic Rays - Cosmology: Diffuse Radiation - Galaxies: Evolution - Gamma Rays: Bursts - Gamma Rays: Theory
Simbad objects:
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