A Multitransition Methanol Maser Study of the Accretion Burst Source G358.93–0.03-MM1

We present the most complete to date interferometric study of centimeter wavelength methanol masers detected in G358.93-0.03 at burst and post-burst epochs. A unique, NIR/(sub)mm-dark FIR-loud MYSO accretion was recently discovered G358.93-0.03. The event accompanied by flares an unprecedented number rare maser transitions. first images three newly-discovered 6.18, 12.23, 20.97 GHz are presented this work. spatial structure evolution 6.67, 12.18, 23.12 is studied two emission all transitions resides a region $\sim$0.2$^{\prime\prime}$ around bursting source shows clear velocity gradient north-south direction, with red-shifted features north blue-shifted south. drastic change morphology masing found: dense compact "spiral" cluster epoch I evolved into disperse, "round" II. During transition from second, traced expanded. comparison our results complementary VLA, VLBI, SMA, ALMA data conducted. obtained support hypothesis presence spiral-arm structures within disk, which suggested previous studies source.