Durations of Gamma-ray Bursts and X-Ray Flashes in X-ray and Gamma-Ray Bands Observed with HETE-2

摘要

We report timing properties of Gamma-ray bursts (GRBs) and X-ray flashes (XRFs) observed by HETE-2. We studied 1) duration (or emission time), 2) Variability and 3) spectral lag of the bursts and empirical relations of them. In particular, we examine whether the empirical relations hold or not in lower energy band below 25 keV.