Flux density excesses (flares) observed in NIR K_s-band polarimetry mode of Sgr A*. These events were observed on 2004 June 13, 2005 July 30, 2006 June 1, 2007 May 15, 2007 May 17, 2008 May 25, 2008 May 27, 2008 May 30, 2008 June 1, 2008 June 3, 2009 May 18, 2011 May 27, 2012 May 17 (the order of the images starts from top left to bottom right). In each panel: top: total flux density (black) and polarized flux density (cyan; polarization degree times total flux density) measured in mJy; middle: degree of linear polarization (red); bottom: polarization angle (blue).