Spectral energy distribution (upper panel) and phase distribution (lower panel) of the X-rays detected with Chandra observatory at the location of the discovered system. The X-ray spectrum can be described by an absorbed power law with the photon index Γ = 1.22 ± 0.23. The X-ray signal correlates with the optical variability observed by OGLE. The energy distribution is very similar to the distributions observed in known ultracompact X-ray binaries. Therefore, we name the new system OGLE-UCXB-01.