High energy emissions from gamma-ray bursts

Gamma-ray bursts are the brightest transient sources of MeV γ-rays in the sky and are the leading candidate sources of the GZK cosmic rays. Physical conditions required to accelerate elementary particles to such high energies also, inevitably, lead to expected TeV energy γ-ray and neutrino emission from these sources. Although γ-rays of energy only up to 18 GeV have been detected from a few bursts, upcoming space- and ground-based detectors will probe these sources in the GeV-TeV energy range revealing their particle acceleration and emission mechanism(s) as well as constraining their astrophysical model(s).