MXB0512-40

G. Clark and F. Li, Massachusetts Institute of Technology, report that SAS 3 has recorded an x-ray burst from a high-latitude source located in a 2-square-degree region that includes the globular cluster NGC 1851. The burst had a conventional form (risetime < 0s.4, duration ~10s) and a peak flux equal to about 0.2 Crab. They believe that the source is identical with the variable x-ray source in NGC 1851 (cf. IAUC 2735) and with the source of a burst found in Uhuru data (Forman et al. 1976, Astrophys. J. 207, L177).