Swift monitoring of IGR J16418-4532
  We report on the Swift observations of the candidate supergiant fast X-ray transient (SFXT) IGR J16418-4532, which has an orbital period of ~3.7 d. Our monitoring, for a total of ~43 ks, spans over three orbits and represents the most intense and complete sampling along the orbital period of the light curve of this source. If one assumes a circular orbit, the X-ray emission from this source can be explained by accretion from a spherically symmetric clumpy wind from a blue supergiant, composed of clumps with different masses, ranging from ~5x10^16 g to 10^21g. 
P. Esposito (1), P. Romano (2), V. Mangano (2), L. Ducci (3), S.   Vercellone (2) ((1) INAF-IASF Milano, (2) INAF-IASF Paler...
astro-ph.HE