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		| Paper: | 
		Simultaneous VLBI and high-energy TeV observations of the γray blazar Mkn 421 | 
	 
	
		| Volume: | 
		290, Active Galactic Nuclei: from Central Engine to Host Galaxy | 
	 
	
		| Page: | 
		329 | 
	 
	
		| Authors: | 
		Charlot, P.; Gabuzda, D. C.; Sol, H.; Degrange, B.; Piron, F. | 
	 
	
	
		| Abstract: | 
		We report results of multi-frequency VLBI polarization observations of the gamma-ray blazar Mkn 421, coordinated with monitoring of its TeV emission with the CAT ground-based Cerenkov telescope. These observations revealed very obvious changes in the core region of Mkn 421 on time scales of a few weeks, at a time when it showed strong TeV activity. The paper will discuss possible correlations between radio core properties and high-energy events in the context of a VLBI-TeV connection. | 
	 
	
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