SIMBAD references

The Observed-minus-Calculated diagram shows a stability of a period being analyzed. In case of binary system, any nonlinear O - C variation indicates an orbital period variation that can be caused by e.g., mass loss or mass transfer between components (physical change), additional component(s) to the system (apparent change only). Baran et al. reported a sinusoidal variation of the O - C of 2M 1938+4603 and interpreted it as a circumbinary planet. We analyzed the newest and most reliable release of the Kepler data of 2M 1938+4603 and by using our newest approach we removed two main sources that could cause the variation not to be intrinsic to 2M 1938+4603. We removed significant signal not associated with binarity and folded eclipses to increase their cadences. Consequently, we lowered rms of the O - C diagram by a factor of six confirming the sinusoidal variation reported by Baran et al. and making it even more convincing now.