ON nine separate occasions between October 27, 1971, and January 6, 1973, the MIT instrument aboard OSO-7 scanned the region of sky within about 10° of the galactic centre. Subsequent analysis of this data, in the form of all-sky maps, led to the discovery of several previously unreported X-ray sources1. The most intense of these, MX1746-20, was found at α = 17 h 46.0 min.δ = -20° 22.2' (1950.0) or, in galactic coordinates lII = 7.73°, bII = 3.76°. The 90% confidence contour for this position is a circle of radius approximately 0.26°. This uncertainty includes an estimate of the probable aspect error as well as statistical uncertainty.