Observation of the 21,1–21,2 Transition of Methanol at 2502.8 MHz in Sgr B2

We have detected the ${2}_{\mathrm{1,1}}\mbox{--}{2}_{\mathrm{1,2}}$ line of A-species methanol at 2502.784 MHz using the Nancay Radio Telescope,6 toward Sgr B2.