NOAA AR region 2887 produced a X1.0 flare on October 28 2021, peaking at 15:35 UT. It was associated with a large coronal wave, a halo CME and a proton event. More information can be found in this STCE news item.
This eruptive event was observed at the very end of the normal observing window, when the 6-m radio telescope stops tracking the Sun and waits for about 30 min before going back to a "parking" position, at the local south.
The radio spectrum below shows however a complex event including a type II burst and a type IV burst covering a large bandwidth.
A preliminary analysis of light curves (see below) at frequencies above 1 GHz shows a maximum power spectral density at about 13 dB above the quiet sun level at 15:28 UT, prior the peak of the flare (15:35 UT).
