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Detection of a Bright H2O Maser Burst from G25.65+1.05 at the Simeiz Radio Telescope RT-22

ATel #10728; Alexandr E. Volvach and Larisa N. Volvach (Crimean Astrophysical Observatory), Gordon MacLeod (Hartebeesthoek Radio Astronomy Observatory), Evgueny E. Lekht and Georgij M. Rudnitskij (Sternberg Astronomical Institute, Moscow State University), Alexandr M. Tolmachev (Pushchino Radio Astronomy Observatory)
on 10 Sep 2017; 19:14 UT
Credential Certification: Georgij Rudnitskij (gmr@sai.msu.ru)

Subjects: Radio, Request for Observations, Transient, Young Stellar Object

Referred to by ATel #: 10757, 10788, 10842, 10853

The source of maser emission in 22.235-GHz H2O line in the star-forming region G25.65+1.05 has experienced a new rapid flare. The peak flux density of the main feature at VLSR = 42.5 km/s was: 2017 April 26 - 600 Jy (Simeiz RT-22 radio telescope); 2017 May 12 - 400 Jy (Simeiz); 2017 June 13 - 410 Jy (Simeiz); 2017 July 25 - 316 Jy (Pushchino RT-22 radio telescope); 2017 August 10 - 620 Jy (Simeiz); 2017 August 21 - 840 Jy (HartRAO); 2017 August 25 - 813 Jy (Pushchino); 2017 August 27 - from 1400 Jy to 2500 Jy (Simeiz); 2017 September 7 - 17000 Jy (Simeiz); 2017 September 8 - 20500 Jy (Simeiz); 2017 September 9 - 21000 Jy (HartRAO). As observed previously in Pushchino, the H2O maser G25.65+1.05 had a strong flare in November-December 2016, its peak flux density exceeding 40000 Jy (paper submitted to Astronomy Reports). Follow-up observations of this source are highly desirable.