Search for the optical counterparts of the γ-ray pulsars J2055+2539, J2043+2740, J1957+5033

First optical observations of 7-ray pulsars J2055+2539, J2043+5740, J1957+5033 have been obtained with the BTA 6m optical telescope. We found no reliable counterpart candidates to these pulsars. However, upper limits on optical fluxes were derived. Comparison of PSR J2055+2539 and PSR J2043+2740 optical limits and their X-ray spectral data likely suggests the presence of spectral breaks between the optical and X-rays in the multiwavelength emission of these pulsars. X-ray spectral data for PSR J1957+5033 are not yet available. In spite of rather deep Ha-observations of PSR J2055+2539, a bow shock nebula, which was expected for the pulsar, has not been detected. Probably, the density of the interstellar medium surrounding the pulsar is not enough for a bright H alpha bow shock to be formed. We also find the further deeper observations of pulsars J2055+2539 and J2043+5740 are reasonable, while a large gamma-ray position error ellipse for J1957+5033 is crowded by background sources and its coordinates should be updated using X-ray observations before any further optical study.