Swift observations of IGR J16479-4514 in outburst

Abstract

Aims. The supergiant fast X-ray transient source IGR J16479-4514 was observed, in outburst two times with Swift. Its quiescent state was investigated in-depth, only once in 2008 through a relatively long pointed observation with XMM-Newton. The latter observation was taken about 1.7 days after the outburst in 2008, and showed an X-ray eclipse-like event, likely caused by the supergiant companion. At present, this is the only supergiant fast X-ray transient that displayed an evidence for an X-ray eclipse. Methods. Here we cany out a comparison between the most recent outburst of IGR J16479-4514, caught by Swift on 29 January 2009 and those detected previously from this source. Results. The decay from the outbursts in 2005, 2008 and 2009 presents many similarities, and suggests a common mechanism that modulates the mass accretion rate onto the neutron star in IGR J16479-4514. © ESO 2009.