The third Swift Burst Alert Telescope gamma-ray burst catalog

Abstract

To date, the Burst Alert Telescope (BAT) onboard Swift has detected ∼ 940 gamma-ray bursts (GRBs), within which close to 320 GRBs have redshift measurements, around 90 GRBs have burst durations (T90) shorter than ∼ 2 s, and about 75 bursts were found in ground processing. Here, we present the analyses of the BAT-detected GRBs for the past ten years. We report summaries of GRB characteristics from analyses using event data (i.e., data within approximately 250 s before and 950 s after the BAT trigger time), such as the burst refined positions, durations, and spectral analyses (spectral indices, fluxes, and fluences) using simple power-law and cutoff power-law fits. In addition, we perform searches for GRB emissions before or after the event data using the BAT survey data. We estimate the false detection rate and report a list of GRBs with confirmed extended emission beyond event data. When redshifts are available, we also investigate GRB properties with redshifts.