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A weak outburst of the millisecond X-ray pulsar SAX J1808.4-3658 in October 1996 as detected from RXTE slew data

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Abstract

Analysis of the RXTE slew data in October 1996 revealed a weak X-ray burst from the millisecond pulsar SAX J 1808.4-3658. 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 ∼1.4×1035 erg s−1 (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 (2σ) upper limit of the pulse fraction is ∼13%.

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Authors and Affiliations

  1. Max Planck Institut für Astrophysik, Karl Schwarzschild Str. 1, 85740, Garching bei München, Germany

    M. G. Revnivtsev

  2. Space Research Institute, Russian Academy of Sciences, Profsoyuznaya ul. 84/32, Moscow, 117810, Russia

    M. G. Revnivtsev

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  1. M. G. Revnivtsev
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Translated from Pis’ma v Astronomicheski\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\) Zhurnal, Vol. 29, No. 6, 2003, pp. 436–439.

Original Russian Text Copyright © 2003 by Revnivtsev.

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Revnivtsev, M.G. A weak outburst of the millisecond X-ray pulsar SAX J1808.4-3658 in October 1996 as detected from RXTE slew data. Astron. Lett. 29, 383–386 (2003). https://doi.org/10.1134/1.1579785

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  • DOI: https://doi.org/10.1134/1.1579785

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