X1.0 flare of October 28 2021
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.