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PSR B1259-63/LS 2883 is a gamma-ray binary system containing a radio pulsarin a highly elliptical ~3.4-year orbit around a Be star. In its 2010 periastronpassage, multiwavelength emission from radio to TeV was observed, as well as anunexpected GeV flare measured by the Fermi Large Area Telescope (LAT). Here, wereport the results of LAT monitoring of PSR B1259-63 during its most recent2014 periastron passage. We compare the gamma-ray behavior in this periastronwith the former in 2010 and find that PSR B1259-63 shows a recurrent GeV flare.The similarities and differences in the phenomenology of both periastronpassages are discussed.

Gamma-ray flare activity from PSR B1259-63 during 2014 periastron passage and comparison to its 2010 passage