Imaging and spectral analysis of the SOL2024-10-03T12:12 event. Panels (A) and (B): Reconstructions obtained from STIX and HXI data between 12:15:10 and 12:15:50 UT. The contours of the reconstructions in the 14–18 keV and in the 50–100 keV energy ranges are plotted in red and blue, respectively. In both panels, contours are plotted at 30%, 50%, 70%, and 90% of the peak intensity in each energy band. The reconstructions are overlaid to a difference image of the continuum acquired by HMI at 12:14:45 and 12:15:30 UT. For reference, the same semicircular loop model (cyan) is plotted in both panels as seen from the corresponding vantage points. Panels (C) and (D): Spectra recorded by STIX and HXI, respectively, in the time range between 12:15:30 and 12:15:40 UT. A thermal (red), nonthermal (blue), and albedo (gray) component was fit to each observed spectra (in black) in the energy range 12–100 keV. The total fit is shown in green, and the reduced χ² value of the fit is printed in the top part of each panel. The energy range used for 3D reconstructions is highlighted in red. All times above are expressed as light arrival times at Earth.