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PSR B1259-63 is a gamma-ray binary system with a radio pulsar orbiting anO9.5Ve star, LS 2883, with a period of ~3.4 yr. Close to the periastron thesystem is detected at all wavelengths, from radio to the TeV energies. Theemission in this time period is believed to originate from the interaction ofLS 2883 and pulsar's outflows. The observations of 4 periastra passages takenin 2010-2021 show strong correlation of the radio and X-ray lightcurves withtwo peaks just before and after the periastron. The observations of the latest2021 periastron passage reveal the presence of the 3rd X-ray peak andsubsequent disappearance of radio/X-ray flux correlation. In this paper wepresent the results of our optical, radio and X-ray observational campaigns onPSR B1259-63 performed in 2021 accompanied with the analysis of the publiclyavailable GeV FERMI/LAT data. We compare the properties of different periastronpassages, discuss the obtained results and show that they can be explained interms of the 2-zone emission cone model proposed by us previously.

The radio to GeV picture of PSR B1259-63 during the 2021 periastron passage