  PSR B1259-63/LS 2883 is a gamma-ray binary system containing a radio pulsar
in a highly elliptical ~3.4-year orbit around a Be star. In its 2010 periastron
passage, multiwavelength emission from radio to TeV was observed, as well as an
unexpected GeV flare measured by the Fermi Large Area Telescope (LAT). Here, we
report the results of LAT monitoring of PSR B1259-63 during its most recent
2014 periastron passage. We compare the gamma-ray behavior in this periastron
with the former in 2010 and find that PSR B1259-63 shows a recurrent GeV flare.
The similarities and differences in the phenomenology of both periastron
passages are discussed.
