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One of the most elusive features of Gamma Ray Bursts (GRBs) is the sporadicemission prior to the main prompt event observed in at least $\sim 15\%$ ofcases. These precursors have spectral and temporal properties similar to themain prompt emission, and smaller, but comparable, energetics. They areseparated from the main event by a quiescent time that may be extremely longand, in some cases, more than one precursor has been observed in the sameburst. Precursors are still a puzzle: despite many attempts none of theproposed models can account for all the observed features. Based on thecomplete sample of bright long GRBs observed by Swift (BAT6), we propose a newscenario for which precursors are explained by assuming that the central GRBengine is a newly born magnetar. In this model the precursor and the promptemission arise from accretion of matter onto the surface of the magnetar. Theaccretion process can be halted by the centrifugal drag exerted by the rotatingmagnetosphere onto the in-falling matter, allowing for multiple precursors andvery long quiescent times.

How to switch on and off a Gamma-ray burst through a magnetar