Are gamma-ray bursts the same at high redshift and low redshift?
Are gamma-ray bursts the same at high redshift and low redshift?
The majority of Swift gamma-ray bursts (GRBs) observed at z > 6 have prompt durations of T90 < 30s, which, at first sight, is surprising given that cosmological time-dilation means this corresponds to < 5s in their rest frames. We have tested whether these high-redshift GRBs are consistent with being …