Abstract
The soft, low‐intensity component persisting for tens of seconds after the much more intense initial pulse complex (IPC) in short bursts is apparent in both the BATSE and Swift/BAT samples. This extended emission (EE) component is present in ∼25% of BAT and BATSE short bursts. The average principle properties of IPCs of short bursts with and without EE are indistin‐guishable, suggesting that short bursts are “unified”. In most short bursts with EE the ratio of average EE flux to peak IPC flux ranges over R∼10−3−5×10−2. A statistical treatment of the BATSE sample, and calibration of the BAT sensitivity to the EE component, suggest that R∼10−3 may be the lower cutoff—that ∼3/4 of short GRBs are truly short with no EE.
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