Spectral evolution responsible for the transition from positive lags to negative lags in Gamma-ray Bursts

Wen-Qiang Liang, Rui-Jing Lu, Cheng-Feng Peng +1

It was well known that most of gamma-ray bursts (GRBs) are dominated by positive spectral lags, while a small fraction of GRBs show negative lags. However, Wei et al. firstly ident…