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PSR B1259$-$63/SS 2883 is a $\gamma$-ray binary system composed of a radiopulsar in a long (1236.7 days) and elliptical ($e\sim0.87$) orbit around a Bestar. In its 2010 periastron passage, multiwavelength emission from radio toTeV was observed, and an unexpected GeV flare was detected by the Fermi LargeArea Telescope (LAT). Here we present the results of the LAT monitoring of PSRB1259$-$63 during its most recent 2014 periastron passage. We confirm that theGeV flare is recurrent within the orbit. The comparison of the 2014 and 2010periastron passages shows overall similarities of flare durations, average fluxlevels, and spectra. In contrast, the detailed time evolutions of the twoflares present interesting differences. Indeed, the light curves of the twoflares show both a different structure and peak energy flux ($9.6 \pm1.8 \times10^{-10}$ erg cm$^{-2}$ s$^{-1}$ and $7.1 \pm1.3 \times 10^{-10}$ erg cm$^{-2}$s$^{-1}$, respectively in 2010 and 2014). While the tail of the 2010 flare theflux decayed exponentially, in 2014 it persisted at a high level. Theinterpretation of these differences as well as of the flare themselves issubject of debate.

High energy $\gamma$-ray emission from PSR B1259$-$63 during 2014 and 2010 periastron passages