SPI GeD detector rates (summed over all detectors), strongly attenuated by SPI-ACS material. The high-energy (above 8 MeV) rate counter highlights very hard narrow pulses (see details in Sect. 2). The two rates are scaled to make the count rate in the 250−270 s time interval is the same height between two rate curves. This figure demonstrates clear detection of the prompt emission above 8 MeV, and the reveals that the first of the two pulses shown is considerably harder, in agrement with Konus-Wind observations (Frederiks et al. 2023).