We present the analysis of KMT-2016-BLG-0212, a low flux-variation (Iflux−var ∼ 20 mag) microlensing event, which is in a high-cadence (Γ = 4hr −1) field of the three-telescope Korea Microlensing Telescope Network (KMTNet) survey. The event shows a short anomaly that is incompletely covered due to the brief visibility intervals that characterize the early microlensing season when the anomaly occurred. We show that the data are consistent with two classes of solutions, characterized respectively by low-mass brown-dwarf (q = 0.037) and sub-Neptune (q < 10−4) companions. Future high-resolution imaging should easily distinguish between these solutions.

Abstract
1. INTRODUCTION
2. OBSERVATIONS AND EVENT RECOGNITION
3. LIGHT CURVE ANALYSIS
    3.1. Heuristic Analysis
    3.2. Grid Search
    3.3. Elimination of Some Topologies
    3.4. Summary of Surviving Models
4. PHYSICAL PARAMETERS
    4.1. Color-Magnitude Diagram
5. FUTURE RESOLUTION
REFERENCES

• R. W. Pogge(Department of Astronomy, Ohio State University)
• B.-G. Park(Korea Astronomy and Space Science Institute/Korea University of Science and Technology)
• Y. Lee(Korea Astronomy and Space Science Institute/School of Space Research, Kyung Hee University)
• D.-J. Lee(Korea Astronomy and Space Science Institute)
• C.-U. Lee(Korea Astronomy and Space Science Institute/Korea University of Science and Technology)
• S.-L. Kim(Korea Astronomy and Space Science Institute/Korea University of Science and Technology)
• S.-M. Cha(Korea Astronomy and Space Science Institute/School of Space Research, Kyung Hee University)
• W. Zhu(Canadian Institute for Theoretical Astrophysics, University of Toronto)
• W. Zang(Physics Department and Tsinghua Centre for Astrophysics, Tsinghua University/Department of Physics, Zhejiang University)
• J. C. Yee(Harvard-Smithsonian CfA)
• Y. Shvartzvald(Jet Propulsion Laboratory, California Institute of Technology/NASA Postdoctoral Program Fellow)
• I.-G. Shin(Harvard-Smithsonian CfA)
• Y.-H. Ryu(Korea Astronomy and Space Science Institute)
• Y. K. Jung(Korea Astronomy and Space Science Institute)
• C. Han(Department of Physics, Chungbuk National University)
• S.-J. Chung(Korea Astronomy and Space Science Institute/Korea University of Science and Technology)
• M. D. Albrow(Department of Physics and Astronomy, University of Canterbury)
• A. Gould(Korea Astronomy and Space Science Institute/Max-Planck-Institute for Astronomy/Department of Astronomy, Ohio State University) Corresponding author
• D.-J. Kim(Korea Astronomy and Space Science Institute)
• H.-W. Kim(Korea Astronomy and Space Science Institute)
• K.-H. Hwang(Korea Astronomy and Space Science Institute)