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We report our recent Swift, NuSTAR, and XMM-Newton X-ray and Lijiang opticalobservations on PSR J2032+4127/MT91 213, the gamma-ray binary candidate with aperiod of 45-50 years. The coming periastron of the system was predicted to bein November 2017, around which high-energy flares from keV to TeV are expected.Recent studies with Chandra and Swift X-ray observations taken in 2015/16showed that its X-ray emission has been brighter by a factors of ~10 than thatbefore 2013, probably revealing some on-going activities between the pulsarwind and the stellar wind. Our new Swift/XRT lightcurve shows no strongevidence of a single vigorous brightening trend, but rather several strongX-ray flares on weekly to monthly timescales with a slowly brighteningbaseline, namely the low state. The NuSTAR and XMM-Newton observations takenduring the flaring and the low states, respectively, show a denser environmentand a softer power-law index during the flaring state, implying that the pulsarwind interacted with stronger stellar winds of the companion to produce theflares. These precursors would be crucial in studying the predicted giantoutburst from this extreme gamma-ray binary during the periastron passage inlate 2017.

Swift, XMM-Newton, and NuSTAR observations of PSR J2032+4127/MT91 213