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Physical Review D
The origin of the ultrahigh-energy (UHE) cosmic rays (CRs) from the second knee (∼6×10^17eV) above in the CR spectrum is still unknown. Recently, there has been growing evidence that a peculiar type of supernovae, called hypernovae, are associated with sub-energetic gamma-ray bursts (GRBs), such as SN1998bw/GRB980425 and SN2003lw/GRB031203. Such hypernovae appear to have high (up to mildly relativistic) velocity ejecta, which may be linked to the sub-energetic GRBs. Assuming a continuousdoi:10.1103/physrevd.76.083009 fatcat:fxjokqp2qjhvhkxbcrvy56j5xy