086035

Among the unassociated sources detected by the Fermi Gamma-ray Space Telescope comma we find one 2.5-hr binary from our multi-wavelength studies. The source comma with an X-ray counterpart comma has an optical spectrum typical of accretion disks in X-ray binaries comma and thus is likely a transitional millisecond pulsar openParMSPclosePar system in the disk state. Such systems can switch between the states of being a pure MSP and having an accretion disk around the MSP. Here we request an 11-ks observation of the source for further studies. A spectrum of the source will be obtained to check whether its X-ray emission is consistent with those of redback type of MSPs. We will also search for fast and large-amplitude flux variations comma which is a distinguishing feature of the transitional systems in the disk state.