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

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.

Submitted to MNRAS. 7 pages, 2 figures; uses mn.sty and psfig

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