Hard X-ray Spectral Investigations of Gamma-ray Bursts, 120521C and 130606A, at High-redshift z~6

Tetsuya Yasuda, Yuji Urata, Junich Enomoto +1

This study presents the temporal and spectral analysis of the prompt emission of two high-redshift gamma-ray bursts (GRBs), 120521C at $z\sim 6$ and 130606A at $z\sim 5.91$, which we…