The inclusive reaction $p A to pK^0_s + X$ was studied at IHEP accelerator with $70 GeV$ proton beam using SVD-2 detector. Two different samples of $K^0_s$, statistically independent and belonging to different phase space regions were used in the analyses and a narrow baryon resonance with the mass $M=1523pm 2(stat.)pm 3(syst.) MeV/c^2$ was observed in both samples of the data