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We present the results of a closure phase analysis of 3 mm very long baselineinterferometry (VLBI) measurements performed on Sagittarius A* (Sgr A*). Wehave analyzed observations made in May 2015 using the Very Long Baseline Array,the Robert C. Byrd Green Bank Telescope and the Large Millimeter TelescopeAlfonso Serrano and obtained non-zero closure phase measurements on severalstation triangles - indicative of a non-point-symmetric source structure. Thedata are fitted with an asymmetric source structure model in Sgr A*,represented by a simple two-component model, which favours a fainter componentdue East of the main source. This result is discussed in light of a scatteringscreen with substructure or an intrinsically asymmetric source.

Asymmetric structure in Sgr A* at 3mm from closure phase measurements with VLBA, GBT and LMT