A Weak Outburst of the Millisecond X-ray Pulsar SAX J1808.4-3658 in October 1996 as Detected from RXTE Slew Data

Astronomy and Astrophysics – Astronomy

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Scientific paper

Analysis of the RXTE slew data in October 1996 revealed a weak X-ray burst from the millisecond pulsar SAX J1808.4-3658. The 3-20-keV energy spectrum of the source can be described by a power law with an index of 2.0 and a (3- to 20 keV) luminosity of 1.4 x 1035 erg/s (the distance to the source was taken to be 2.5 kpc). Because of the short exposure time, we failed to detect weak pulsations at a frequency of 401 Hz in the source. The (2 sigma) upper limit of the pulse fraction is 13%.

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