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We report optical B-band observations with the Large Binocular Telescope LBTof the isolated neutron star RBS1774. The stacked image with total exposure2.5h reveals a candidate optical counterpart at mB = 26.96 +- 0.20 at positionRA(2000) = 21:43:03.4, DEC(2000)} = +06:54:17:5, within the joint Chandra andXMM-Newton error circles. We analyse archival XMM-Newton observations andderive revised spectral and positional parameters. The predicted optical fluxfrom the extrapolated X-ray spectrum is likely twice as high as reportedbefore. The measured optical flux exceeds the extrapolated X-ray spectral fluxby a factor ~40 (15 - 60 at 1sigma confidence). We interpret our detection andthe spectral energy distribution as further evidence of a temperature structureover the neutron star's surface and present a pure thermal model reflectingboth the SED and the pulsed fraction of the light curve.

The isolated neutron star RBS1774 revisited. Revised XMM-Newton X-ray parameters and an optical counterpart from deep LBT-observations