We are demonstrating in what way slowing down ultrarelativistic shocks are creating GRB lags. The reflection process produces positive lags and Cracow acceleration process negative lags. We present a way the seed particles are injected into relativistic jets.
@article{arxiv.1009.3100,
title = {Relativistic slowing down shocks as sources of GRB lag},
author = {Janusz Bednarz},
journal= {arXiv preprint arXiv:1009.3100},
year = {2017}
}