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The orbital profile of the High Mass X-ray binary IGR J16393-4643 shows a dipin its X-ray intensity, which was previously interpreted as an eclipse. Unlikemost eclipsing HMXBs, where the X-ray eclipses are about two orders ofmagnitude fainter compared to the out of eclipse emission, this particulareclipse like feature is narrow and partial, casting doubt if it is indeed aneclipse. To further investigate the nature of this low intensity orbital phase,we use a large number of observations with Swift-XRT, covering the entireorbital phase. The soft X-ray observations also show this low intensity phase,which is about 30% of the intensity during rest of the orbit. We also carriedout orbital phase resolved spectroscopy to compare the change in the spectralparameters inside and outside of this low intensity state. The results indicatethat this low intensity state might not be an eclipse, as previously thoughtbut absorption in the stellar corona. We have also provided the inclinationangle of the binary for grazing eclipse caused by the stellar corona.

Investigating a unique partial eclipse in the High Mass X-ray Binary IGR J16393-4643 with Swift-XRT