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The recent discovery of a milli-second radio pulsar experiencing an accretionoutburst similar to those seen in low mass X-ray binaries, has opened up a newopportunity to investigate the evolutionary link between these two differentneutron star manifestations. The remarkable X-ray variability and hard X-rayspectrum of this object can potentially serve as a template to search for otherX-ray binary/radio pulsar transitional objects. Here we demonstrate that thetransient X-ray source XMM J174457-2850.3 near the Galactic center displayssimilar X-ray properties. We report on the detection of an energeticthermonuclear burst with an estimated duration of ~2 hr and a radiated energyoutput of ~5E40 erg, which unambiguously demonstrates that the source harborsan accreting neutron star. It has a quiescent X-ray luminosity of Lx~5E32 erg/sand exhibits occasional accretion outbursts during which it brightens toLx~1E35-1E36 erg/s for a few weeks (2-10 keV). However, the source oftenlingers in between outburst and quiescence at Lx~1E33-1E34 erg/s. This unusualX-ray flux behavior and its relatively hard X-ray spectrum, a power law with anindex of ~1.4, could possibly be explained in terms of the interaction betweenthe accretion flow and the magnetic field of the neutron star.

The peculiar Galactic center neutron star X-ray binary XMM J174457-2850.3