Volvach, L. N.L. N.VolvachVolvach, A. E.A. E.VolvachLarionov, M. G.M. G.LarionovMacLeod, G. C.G. C.MacLeodWolak, P.P.WolakKramer, B.B.KramerMenten, K. M.K. M.MentenKraus, A.A.KrausBRAND, JANJANBRANDZANICHELLI, AlessandraAlessandraZANICHELLIPOPPI, SergioSergioPOPPIRIGHINI, SIMONASIMONARIGHINI2020-12-282020-12-2820190004-6361http://hdl.handle.net/20.500.12386/29202<BR /> Aims: We present our monitoring observations and analysis of water masers associated with W49N taken in 2017 and 2018. A significant flare occurred during these observations. <BR /> Methods: We used ground-based radio telescopes in Simeiz (RT-22), Torun (RT-32), Medicina (RT-32), Effelsberg (RT-100) with broadband spectrometers. Observational data were collected and processed automatically. <BR /> Results: We report a powerful flare of the v = +6 km/s water maser feature; it increased in over ten months to S(1.3 cm) = 84 kJy in 2017 December, then decayed to the pre-flare quiescent value of S(1.3 cm) = 8.7 kJy in 2018 August. We infer that this flaring feature is unsaturated based on the relationship between line width and flux density.ELETTRONICOenArticle10.1051/0004-6361/2019355212-s2.0-85090092738000480649300002https://www.aanda.org/articles/aa/full_html/2019/08/aa35521-19/aa35521-19.html2019A&A...628A..89VFIS/05 - ASTRONOMIA E ASTROFISICA