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We report a discovery of strong modulations of the X-ray flux detected fromIGR J16320-4751 = AX J1631.9-4752 with a period of P~1300 sec. We reanalyzedthe data of an XMM-Newton ToO performed soon after the discovery of the sourceby INTEGRAL and found the modulation at a period of P=1309+/-40 sec with a highsignificance. Modulations of the source flux with two possible periods of ~1300and ~1500 sec were identified in the ASCA archival data. It is very likely thatthe modulation can be interpreted as X-ray pulsations, favouring a pulsar asthe compact object in IGR/AX J16320-4752. Thus for the moment this sourcebecame the fourth source from a new class of highly absorbed binary systems forwhich the pulsations are observed.Comment: accepted for the publication in A&A Letters, 4 pages, 4 figure

Discovery of X-ray pulsations from IGR J16320–4751 = AX J1631.9–4752