Impact of G1's closest approach on the brightness of Sgr A*. The blue dashed line marks the G1's periapse (2001), and red line marks the predicted peak Sgr A* flux due to the closest approach of G1. No brightening or flares of Sgr A*, i.e., no apparent impacts of G1 on the Sgr A* IR emission, were observed between 2001 and 2005.