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IGR J00291+5934 X-ray Decay Rate is Increasing

ATel #365; J. H. Swank (NASA/GSFC) & C. B. Markwardt (U. Maryland & GSFC)
on 11 Dec 2004; 21:23 UT
Credential Certification: Craig B. Markwardt (craigm@lheamail.gsfc.nasa.gov)

Subjects: X-ray, Binary, Neutron Star, Transient, Pulsar

Referred to by ATel #: 369, 1660

RXTE continues to monitor the millisecond X-ray pulsar IGR J00291+5934. The X-ray flux has decayed from a maximum of 29 mCrab (2-10 keV) on Dec 3, to less than 10 mCrab on Dec 11, 14:00 UTC.

Overall, the X-ray decay has been quite linear. However, within the past day, the rate of decline has increased slightly. If the decay continues on its present trend, it will become undetectable by the PCA within 2-3 days (i.e. by Dec ~14).