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We report the first observation of the processes $e^+e^-\to\Upsilon(\rm1S,2S)\eta$ at $\sqrt{s}=10.866$~GeV with a $10.2\sigma$ and $16.5\sigma$significance respectively. The measured Born cross sections are $\sigma(e^+e^-\to \Upsilon(2S)\eta)=2.07 \pm 0.21 \pm 0.19$~pb, and $\sigma(e^+e^- \to\Upsilon(\rm 1S)\eta)=0.42 \pm 0.08 \pm 0.04$~pb. We also set the upper limiton the cross section of the process $e^+e^- \to \Upsilon(\rm 1S)\eta^{\prime}$to be $\sigma(e^+e^- \to \Upsilon(\rm 1S)\eta^{\prime})<0.035$~pb at $90\%$ CL.The results are obtained with the data sample collected with the Belle detectorat the KEKB asymmetric-energy $e^+e^-$ collider in the energy range from$10.63$~GeV to $11.02$~GeV.

Study of $e^+e^-\to \Upsilon(\rm1S,2S)\eta$ and $e^+e^-\to \Upsilon(\rm 1S)\eta^{\prime}$ at $\sqrt{s}=10.866$ GeV with the Belle detector