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Outburst of Millisecond X-ray Pulsar XTE J1751-305

ATEL # 1045; C. B. Markwardt (CRESST/U. Maryland/NASA/GSFC), J. H. Swank (NASA/GSFC)
on 5 Apr 2007; 0:46 UT
Distributed as an Instant Email Notice (Request for Observations)
Password Certification: Craig B. Markwardt (

Subjects: X-ray, Request for Observations, Neutron Stars, Pulsars, Transients
Referred to by ATEL #: 1046

In galactic bulge monitoring observations on 04 Apr 2007 17:30 UT, the RXTE PCA detected a source consistent with the position of XTE J1751-305. This source is a millisecond X-ray pulsar with a 435 Hz pulse period, which was last reported active in 2005 by INTEGRAL (Grebenev et al. 2005, ATEL #446).

The measured flux was about 10 mCrab (2-10 keV). No pulsations were obvious in the brief (~50 second) scans over the source. However, it is not trivial to set a realistic upper limit to the pulsed fraction.

Additional RXTE observations are being planned.

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R. E. Rutledge , Editor
ATEL Mirror v1.0 Updates