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A new accreting millisecond X-ray pulsar, IGR J17511-3057, was discovered inoutburst on 2009 September 12 during the INTEGRAL Galactic bulge monitoringprogramme. To study the evolution of the source X-ray flux and spectralproperties during the outburst, we requested a Swift monitoring ofIGRJ17511-3057. In this paper we report on the results of the first two weeksof monitoring the source. The persistent emission of IGR J17511-3057 during theoutburst is modeled well with an absorbed blackbody (kT~0.9 keV) and apower-law component (photon index~1-2), similar to what has been observed fromother previously known millisecond pulsars. Swift also detected three type-IXray bursts from this source. By assuming that the peak luminosity of thesebursts is equal to the Eddington value for a pure helium type-I X-ray burst, wederived an upper limit to the source distance of ~10 kpc. The theoretical,expected recurrence time of the bursts according to the helium burst hypothesisis 0.2-0.9 days, in agreement with the observations.

Swift monitoring of the new accreting millisecond X-ray pulsar IGRJ17511-3057 in outburst