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A significant fraction of the Long Gamma-ray Bursts (LGRBs) in the Swiftsample have a plateau phase showing evidence of ongoing energy injection. Wesuggest that many Short Gamma-ray Bursts (SGRBs) detected by the Swiftsatellite also show evidence of energy injection. Explaining this observationwithin the typical SGRB progenitor model is challenging as late time accretion,often used to explain plateaus in LGRBs, is likely to be absent from the SGRBpopulation. Alternatively, it is predicted that the remnant of NS-NS mergersmay not collapse immediately to a BH (or even collapse at all), forming insteadan unstable millisecond pulsar (magnetar) which powers a plateau phase in theX-ray lightcurve. By fitting the magnetar model to all of the Swift SGRBsobserved until May 2012, we find that about half can be clearly fitted with amagnetar plateau phase while the rest are consistent with forming a magnetarbut the data are insufficient to prove a plateau phase. More data, both atearly times and a larger sample, are required to confirm this. This model canbe tested by detecting the gravitational wave emission from events using thenext generation gravitational wave observatories.

Signatures of magnetar central engines in short GRB lightcurves