Spin and Pulsed X-ray Flux Properties of SGR 1806-20 after the Giant Flare

Astronomy and Astrophysics – Astronomy

Scientific paper

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X-Ray, Neutron Stars, Soft Gamma-Ray Repeaters

Scientific paper

The Soft Gamma Repeater SGR 1806-20 emitted a giant flare that was recorded on 2004 December 27 (GCN 2920). We triggered an ongoing sequence of ToO observations of the SGR with RXTE that began on 2005 January 22, the earliest RXTE could observe due to Sun-angle constraints. We find no evidence for a sudden change in spin frequency of the SGR following this flare and place a limit on such a frequency jump of |delta nu| < 2 x 10^-5 Hz.

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