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Title:
Kilohertz QPOs, spectral state transitions and the distance to the neutron star X-ray transient IGR J17473-2721.
Authors:
Altamirano, D.; Galloway, D.; Chenevez, J.; in't Zand, J.; Kuulkers, E.; Degenaar, N.; Del Monte, E.; Feroci, M.; Costa, E.; Evangelista, Y.; Falanga, M.; Markwardt, C.; Wijnands, R.; Van Der Klis, M.
Publication:
The Astronomer's Telegram, #1651
Publication Date:
08/2008
Origin:
ATEL
Keywords:
X-ray, Binaries, Neutron Stars, Transients
Bibliographic Code:
2008ATel.1651....1A

Abstract

We report on RXTE monitoring observations of the transient X-ray binary IGR J17473-2721 since the beginning of its latest outburst on March 26th, 2008 (see ATEL #1445, #1459, #1460, #1461 and #1468). IGR J17473-2721 reached a maximum unabsorbed flux of ~1.30E-8 ergs cm-2 s-1 (2-10 keV, assuming nH=3.8e22cm-2, ATEL #1459) on June 22nd, and has been steadily decreasing since. The X-ray spectral state (based on the X-ray colors in the 2-16 keV band) has switched from hard to soft and back to hard.
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