GRBs are now detected up to z = 8.26 . We try to find differences, in their restframe properties, which could be related either to distance or to observing conditions.
@article{arxiv.0912.2982,
title = {Properties of Gamma Ray Bursts at different redshifts},
author = {G. Pizzichini and E. Maiorano and M. Genghini and F. Munz},
journal= {arXiv preprint arXiv:0912.2982},
year = {2009}
}