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4FGL J0935.5+0901, a $\gamma$-ray source recently identified as a candidateredback-type millisecond pulsar binary (MSP), shows an interesting feature ofhaving double-peaked emission lines in its optical spectrum. The feature wouldfurther suggest the source as a transitional MSP system in the sub-luminousdisk state. We have observed the source with \xmm\ and Five-hundred-meterAperture Spherical radio Telescope (FAST) at X-ray and radio frequenciesrespectivelyfor further studies. From the X-ray observation, a bimodalcount-rate distribution, which is a distinctive feature of the transitional MSPsystems, is not detected, while the properties of X-ray variability andpower-law spectrum are determined for the source. These results help establishthe consistency of it being a redback in the radio pulsar state. However noradio pulsation signals are found in the FAST observation, resulting an upperlimit on the flux density of $\sim 4\,\mu$Jy. Implications of these results arediscussed.

X-ray and Radio Studies of the candidate Millisecond Pulsar Binary 4FGL J0935.3+0901