Feb 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000iauc.7358....3v&link_type=abstract
IAU Circ., 7358, 3 (2000). Edited by Green, D. W. E.
Other
13
Scientific paper
M. van der Klis, University of Amsterdam; D. Chakrabarty, J. C. Lee, E. H. Morgan, and R. Wijnands, Massachusetts Institute of Technology; C. B. Markwardt, University of Maryland and Goddard Space Flight Center (GSFC); and J. H. Swank, GSFC, write: "The x-ray transient SAX J1808.4-3658, the only known accretion-powered millisecond pulsar (IAUC 6876, 6877), has been detected at a low x-ray-flux level of 3-12 mCrab (2-10 keV) since Jan. 21.1 UT with the PCA instrument on the Rossi X-Ray Timing Explorer (RXTE). The start time of this outburst is not known because the source was unobservable by RXTE from about 1999 Nov. 2 to 2000 Jan. 21, due to its proximity to the sun. On 1999 Nov. 2, the upper limit on the source flux was < 0.5 mCrab (2-10 keV). X-ray pulsations at the 401-Hz spin frequency were detected in several short observations between Jan. 21.1 and Feb. 6.2. Since Feb. 2, the source has exhibited violent quasi-periodic x-ray flaring with an rms amplitude varying between 40 and 100 percent of the average flux and a repetition frequency varying between 0.9 and 1.5 Hz. This is unlike any phenomenon previously observed in a neutron-star low-mass x-ray binary. The source is still close to the sun, but observations at other wavelengths (particularly radio and infrared) are strongly encouraged."
Chakrabarty Deepto
Lee Jae-Chul
Markwardt Craig B.
Morgan Edward Harrington
Swank Jean H.
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