  Using the 9 years of continuous data now available from the Burst And
Transient Source Experiment (BATSE) aboard CGRO, we have measured orbital
periods and produced folded lightcurves for 8 High Mass X-ray Binaries (HMXB).
Given the length of the datasets, our determinations are based on many more
binary orbits than previous investigations. Thus our source detections have
high statistical significance and we are able to follow long-term trends in
X-ray output. In particular we focus on two systems: A0538-668 and EXO2030+375
both HMXBs exhibiting Type I outbursts.

Astrophysics