1999ApJ...522.1069M

The concept of emission time τ_N is suggested as a temporal parameter which is complementary to the classical parameters of duration times T₅₀ and T₉₀. The emission time is defined as the time of emission of N% of the total fluence. The definition adds the time bins of high fluence in decreasing fluence rank until N% of the fluence has been reached. The emission time interval excludes low-emission intervals of bursts, and so the emission time characterizes the state of high-power emission. The distribution of this new parameter is found to be bimodal for bright bursts. The distributions of emission time τ₃₀ and τ₅₀, for groups based on burst intensity, are also compared.