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Since November 2004, the Burst Alert Telescope on board Swift is producing amonitoring of the entire sky in the 15-150 keV band, recording the timing andspectral behavior of the detected sources. Here we study the properties of theHMXB 4U 1036-56 using both the BAT survey data and those from a Swift-XRTobservation. A folding analysis performed on the BAT light curve of the first100 months of survey unveils a periodic modulation with a period of 61.0 days,tied to the presence in the BAT light curve of several intensity enhancementslasting ~1/4 of P_0. We explain this modulation as the orbital period of thebinary system. The position of 4U 1036-56 on the Corbet diagram, the derivedsemi-major orbit axis (~ 180 R_sun), and the bulk of the source emissionobserved in a limited portion of the orbit are consistent with a Be companionstar. The broad band 0.2-150 keV spectrum is well modeled with a flat absorbedpower law with a cut-off at ~16 keV. Finally, we explore the possibleassociation of 4U 1036-56 with the gamma-ray source AGL J1037-5808, findingthat the BAT light curve does not show any correlation with the gamma-rayoutburst observed in November 2012.

Finding a 61.0-day orbital period for the HMXB 4U 1036-56 with the Swift-BAT monitoring