Relativistic slowing down shocks as sources of GRB lag

TL;DR

This paper explains how slowing down ultrarelativistic shocks in GRB jets produce observable time lags, with different processes causing positive or negative delays in gamma-ray bursts.

Contribution

It introduces a new model detailing how seed particles are injected into relativistic jets and how different shock processes generate GRB lags.

Findings

Reflection process produces positive lags

Cracow acceleration causes negative lags

Seed particle injection mechanism proposed

Abstract

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.