Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apj...536l..23t&link_type=abstract
The Astrophysical Journal, Volume 536, Issue 1, pp. L23-L26.
Astronomy and Astrophysics
Astronomy
14
Acceleration Of Particles, Ism: Cosmic Rays, Cosmology: Diffuse Radiation, Galaxies: Evolution, Gamma Rays: Bursts, Gamma Rays: Theory
Scientific paper
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.
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