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We report a comprehensive catalog of emission episodes within long gamma-raybursts (GRBs) that are separated by a quiescent period during which gamma-rayemission falls below the background level. We use a fully automatedidentification method for an unbiased, large scale and expandable search. Weexamine a comprehensive sample of long GRBs from the BATSE, Swift and Fermimissions, assembling a total searched set of 2710 GRBs, the largest catalog ofisolated emission episodes so far. Our search extends out to [-1000s,750s]around the burst trigger, expanding the covered time interval beyond previousstudies and far beyond the nominal durations (T90) of most bursts. We compareour results to previous works by identifying pre-peak emission (or precursors),defined as isolated emission periods prior to the episode with the highest peakluminosity of the burst. We also systematically search for similarly definedperiods after the burst's peak emission. We find that the pre-peak andpost-peak emission periods are statistically similar, possibly indicating acommon origin. For the analyzed GRBs, we identify 24% to have more than oneisolated emission episode, with 11% having at least one pre-peak event and 15%having at least one post-peak event. We identify GRB activity significantlybeyond their T90, which can be important for understanding the central engineactivity as well as, e.g., gravitational-wave searches.

Catalog of Isolated Emission Episodes in Gamma-ray Bursts from Fermi, Swift and BATSE