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The error region of the the gravitational-wave (GW) event GW151226 wasobserved with Monitor of All-sky X-ray Image (MAXI). MAXI was operated at thetime of GW151226, and continuously observed to 4 minutes after the event. MAXIcovered about 84% of the 90 percent error region of the GW event during thefirst 92 minutes orbit after the event. No significant X-ray transient wasdetected in the GW error region. A typical 3-$\sigma$ GSC upper limit for ascan is 1.2 $\times 10^{-9}$ ergs cm$^{-2}$ s$^{-1}$ in the 2-20 keV. Theauto-detection (MAXI nova-search) systems detected a short excess event with alow significance (2.85$\sigma$) from 5257 s to 5260 s after the GW trigger.Finally, we discuss the sensitivity of MAXI to long X-ray emissions of shortgamma-ray bursts, which are expected to accompany GW events.

X-ray upper limits of GW151226 with MAXI