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The imager on board INTEGRAL (IBIS) presently provides the most detailed skyimages ever obtained at energies above 30 keV. The telescope is based on acoded aperture imaging system which allows to obtain sky images in a largefield of view 29deg x 29deg with an angular resolution of 12'. The System PointSpread Function of the telescope and its detailed characteristics are heredescribed along with the specific analysis algorithms used to derive theaccurate point-like source locations. The derived location accuracy is studiedusing the first in-flight calibration data on strong sources for the IBIS/ISGRIsystem. The dependence of the calibrated location accuracy with the signal tonoise ratio of the sources is presented. These preliminary studies demonstratethat the IBIS/ISGRI telescope and the standard scientific analysis softwareallow source localizations with accuracy at 90% confidence level better than 1'for sources with signal to noise ratios > 30 over the whole field of view, inagreement with the expected performances of the instrument.Comment: 5 pages, 5 figures, accepted for publication in A&A Lett (INTEGRAL  special issue

The INTEGRAL IBIS/ISGRI System Point Spread Function and Source Location Accuracy