Notes. Reported statistical errors with 68% confidence level. The first column reports the source name for which the fit was performed. The second column reports the value C of the obtained minimum for the cash estimator. r_burst is the burst rate in y⁻¹, m_log(τ) is the mean of the Gaussian distribution for log(τ_burst), with τ_burst in y. The standard deviation of the distribution of log(τ_burst) is held fixed at the value obtained fitting the multi-loghat function to the accumulated distribution of waiting times (σ_log(τ) = 0.36). To keep at a minimum the contribution of the short waiting time component, the fit is performed on the reduced sample with Δ_t >  0.3 d.