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The Rapid Burster (MXB1730-335) is a unique object showing both type I (thermonuclear) and type II (spasmodic accretion) X-ray bursts. It experiences regular outbursts every 100-200 days, lasting for 2-4 weeks. In January-March 2009 the Rapid Burster experienced a long (20 days) plateau. We obtained 20ks of Swift TOO observations during this period, between February 26 and March 5. A Type I X-ray burst with photospheric radius expansion was observed on 2009 March 5 among type II bursts.

A type I X-ray burst of the Rapid Burster with photospheric radius expansion as seen by Swift