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Bursting Activity in a High-Mass Star-Forming Region G33.640.21 Observed with the 6.7 GHz Methanol Maser

Bursting Activity in a High-Mass Star-Forming Region G33.640.21 Observed with the 6.7 GHz Methanol Maser

We report the detection of bursts of 6.7 GHz methanol maser emission in a high-mass star-forming region, G33.64-0.21. One of the spectral components of the maser in this source changed its flux density by 7 times that of the previous day, and it decayed with a timescale of 5 days. …