HXR light curves and imaging of the flare in the duration of radio bursts. (a) ASO-S/HXI count rates of combined total flux detectors (D92+D93+D94) in three energy channels in the range 15−300 keV. (b) Fermi/GBM HXR flux in five channels in the range 4−300 keV. The red dashed lines indicate the peak of the curves at 08:23:52 UT. (c) and (d) Contours of HXR sources from HXI, in energy ranges of 15−25 keV (orange), 20−30 keV (blue), and 30−50 keV (red), overplotted on the AIA 1600 Å and HMI magnetogram images. The contour levels represent 25% and 60% of the maximum. The yellow arrow indicates the positive polarity at the center of the circular ribbon.