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We report the discovery of two new types of variability in the neutron starlow-mass X-ray binary MXB 1730-335 (the 'Rapid Burster'). In one observation in1999, it exhibits a large-amplitude quasi-periodic oscillation with a period ofabout 7 min. In another observation in 2008, it exhibits two 4-min long 75 percent deep dips 44 min apart. These two kinds of variability are very similar tothe so-called $\rho$ or 'heartbeat' variability and the $\theta$ variability,respectively, seen in the black hole low-mass X-ray binaries GRS 1915+105 andIGR J17091-3624. This shows that these types of behavior are unrelated to ablack hole nature of the accretor. Our findings also show that these kinds ofbehaviour need not take place at near-Eddington accretion rates. We speculatethat they may rather be related to the presence of a relatively wide orbit withan orbital period in excess of a few days and about the relation between theseinstabilities and the type II bursts.

Discovery of GRS 1915+105 variability patterns in the Rapid Burster