An outburst of the accreting millisecond X-ray pulsar XTE J1751-305 detected with INTEGRAL
ATel #446; S. A. Grebenev (IKI, Moscow), S. V. Molkov (IKI, Moscow), R. A. Sunyaev (IKI, Moscow; MPA, Garching)
on 28 Mar 2005; 18:51 UT
Distributed as an Instant Email Notice Request For Observations
Credential Certification: S.A.Grebenev (sergei@hea.iki.rssi.ru)
Subjects: Request for Observations, Neutron Star, Transient, Pulsar
The X-ray transient XTE J1751-305 was detected in outburst with IBIS/ISGRI on March 28.054-28.464, 2005 (UT), during INTEGRAL deep Open Program observations of the Galactic center region. The average flux was equal to 20.4+/-1.2 and 16.8+/-2.8 mCrab in the 18-45 and 45-80 keV bands. No notable variabilty was found on a time scale of hours during this time interval. The source was not detected during our previous observations of the region on March 26.104-26.778.
XTE J1751-305 was discovered with RXTE on April 3, 2002, during the outburst lasted 12 days (IAUC # 7867 ). It is one of the four currently known accreting millisecond pulsars and the second of this kind to be found. It has a spin frequency of 435 Hz.
We encourage follow-up observations of this source at all wavelengths.
