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We report on temporal and spectral analysis of the INTEGRAL fast transientcandidate IGR J16328-4726 observed with Beppo SAX in 1998 and more recentlywith INTEGRAL. The MECS X-ray data show a frequent micro activity typical ofthe intermediate state of Supergiant Fast X-ray Transients and a weak flarewith duration of ~4.6 ks. The X-ray emission in the 1.5-10 keV energy range iswell described through the different time intervals by an absorbed power lawmodel. Comparing spectra from the lower emission level up to the peak of theflare, we note that while the power-law photon index was constant (~2), theabsorption column density varied by a factor of up to ~6-7, reaching the valueof ~2x10^{23}cm^{-2} at the peak of the flare. Analysis of the long-termINTEGRAL/IBIS light curve confirms and refines the proposed ~10.07 day period,and the derived ephemeris places the Beppo SAX observations away fromperiastron. Using the near and the mid-IR available observations, weconstructed a spectral infrared distribution for the counterpart of IGRJ16328-4726, allowing us to identify its counterpart as a High Mass OB typestar, and to classify this source as a firm HMXB. Following the standard clumpywind theory, we estimated the mass and the radius of the clump responsible ofthe flare. The obtained values of M~4x10^{22}g and R~4.4x10^6 km are inagreement with expected values from theoretical predictions.

The INTEGRAL source IGR J16328-4726: a High Mass X-ray Binary from the Beppo SAX era