Multi-epoch VLBI of a double maser super burst
  In a rare and spectacular display, two well-known massive star forming
regions, W49N and G25.65+1.05, recently underwent maser 'super burst' - their
fluxes suddenly increasing above 30,000 and 18,000 Jy, respectively, reaching
several orders of magnitude above their usual values. In quick-response, ToO
observations with the EVN, VLBA and KaVA were obtained constituting a 4 week
campaign - producing a high-cadence multi-epoch VLBI investigation of the maser
emission. The combination of high-resolution, polarisation and flux monitoring
during the burst provides one of the best accounts, to date, of the maser super
burst phenomenon, aiding their use as astrophysical tools. These proceedings
contain the preliminary results of our campaign.
