Plot of redshift‐corrected burst pulse lags, ﹩\Delta t﹩, observed between BATSE channels 1 and 3, vs. observed jet‐break times, corrected for redshift, ﹩\tau _{j}\equiv t_{j}/ ( 1+z) ﹩. Jet‐break times ﹩t_{j}﹩ are from Frail et al. (2001), and pulse lags are from Norris et al. (2000). The fit, given by eq. (1), does not include GRB 971214, which only has a lower limit on the jet‐break time.