Abstract
THE faint, high galactic latitude X-ray source 3U0901–09 (ref. 1) has been previously associated2, on positional grounds, with the rich cluster of galaxies, Abell 754 (distance class 3, richness class 2)3. Since the Uhuru 90%-confidence positional error box for 3U0901–09 is relatively large, having an area of 2.6 degree2, it is worthwhile, in view of current theoretical interest in X-ray emission from clusters of galaxies (see, for example, ref. 8), to reduce the positional uncertainty and thus confirm or reject the proposed identification with A754.
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