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We investigate hypernova (hyper-energetic supernova) and gamma-ray burst(GRB) remnants in our Galaxy as TeV gamma-ray sources, particularly in the roleof potential TeV unidentified sources, which have no clear counterpart at otherwavelengths. We show that the observed bright sources in the TeV sky could bedominated by GRB/hypernova remnants, even though they are fewer than supernovaremnants (SNRs). If this is the case, TeV SNRs are more extended (and morenumerous) than deduced from current observations. In keeping with their role ascosmic ray accelerators, we discuss hadronic gamma-ray emission from pi^0decay, from beta decay followed by inverse Compton emission, and propose athird, novel process of TeV gamma-ray emission arising from the decay ofaccelerated radioactive isotopes such as 56Co entrained by relativistic orsemi-relativistic jets in GRBs/hypernovae. We discuss the relevantobservational signatures which could discriminate between these threemechanisms.

Hypernova and Gamma-Ray Burst Remnants as TeV Unidentified Sources