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E.H. Morgan, D. Chakrabarty, R. Wijnands (MIT), M. van der Klis (University of Amsterdam)
In 1998, the X-ray burst source SAX~J1808.4-3658 was found to be the first accretion powered millisecond pulsar. RXTE observations showed a neutron star with a spin frequency of 400.9752106(8)Hz in a binary orbit with a period of 7249.119(1)s. This year there was another outburst of this source. We present the analysis of the pulse timing of this recent outburst. The pulsations are clearly present, even though the outburst was much fainter than previous ones.