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Search for Millisecond Periodicities in Type I X-ray Bursts of the Rapid Burster

D. W. Fox, W. H. G. Lewin, R. E. Rutledge, E. H. Morgan, R. Guerriero, L. Bildsten, M. van der Klis, J. van Paradijs, C. B. Moore, T. Dotani, K. Asai

astro-pharXiv:astro-ph/0009224

Abstract

We have searched the rising portion of type I X-ray bursts observed from the Rapid Burster with the Rossi X-ray Timing Explorer for the presence of periodicities. The 95 per cent confidence upper limit on the average root-mean-square variation of near coherent pulsations with a width of <1 Hz (in 60--2048 Hz) during the first second of the bursts is <8.8 per cent. We find a possible detection (>98 per cent significance) at 306.5 Hz.

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