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.
@article{arxiv.1812.09454,
title = {Multi-epoch VLBI of a double maser super burst},
author = {Ross A. Burns and Olga Bayandina and Gabor Orosz and Mateusz Olech and Katharina Immer and Jay Blanchard and Benito Marcote and Huib van Langevelde and Tomoya Hirota and Kee-Tae Kim and Irina Valtts and Nadya Shakhvorostova and Georgij Rudnitskii and Alexandr Volvach and Larisa Volvach and Gordon MacLeod and James O. Chibueze and Gabriele Surcis and Busaba Kramer and Willem Baan and Crystal Brogan and Todd Hunter and Stan Kurtz},
journal= {arXiv preprint arXiv:1812.09454},
year = {2018}
}