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Quasar J152645.61+193006.7 ($z_{\rm e}=2.5771$) was observed by the SloanDigital Sky Survey (SDSS) on 2006 May 31, and again on 2011 April 9. The timeinterval of the SDSS two observations is 497.4 days at the quasar rest frame.From the spectra of this quasar, we detect a phenomenon of disappearance of anarrow $\rm Mg II \lambda\lambda2796,2803$ absorption system with a velocity upto $\rm 166,129 km s^{-1}$ with respect to the quasar. This disappearance eventcan be caused by changes in the ionization state of absorbing gas or by thebulk motion of the absorbing gas across the quasar sightline. The coveragefraction analysis shows that this absorber partially covers the backgroundemission sources with an effective coverage fraction of $C_{\rmf}=0.40\pm0.06$. The time variation analysis and the coverage fraction analysisimply that this absorber might be intrinsic to the quasar. However, thescenario of a cosmologically separated foreground object located at $z=0.9170$accounting for the phenomenon cannot be ruled out according to currentavailable data.

Disappearance of a narrow Mg II absorption system with a measured velocity up to $\rm 166,000 km s^{-1}$