2S 1254-690

T. J.-L. Courvoisier, A. Parmar and A. Peacock, European Space Agency, report the discovery of a 3.9-hr period in the x-ray light curve of the burst source 2S 1254-690. EXOSAT observed the object for 12 hr on May 15; three absorption dips were registered during the observing session, indicating the above period. The intensity during the dips was approximately half of the normal quiescent emission, and much more shallow than the dip observed during the first EXOSAT measurement (cf. IAUC 3932). No burst occurred during the 12 hr of the second EXOSAT observing session.