Fig. 2
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GBM light curve of RX J0440 around trigger 230204.473 obtained by merging events from the NaI detectors N6, N7, and N8 in the 8–70 keV energy band and with a 1 s binning around the trigger (8 s otherwise). The sine-like long-term trend shows the source pulsation with an ~205 s periodicity. QPOs are evident at the peak of first pulse profile, around the GBM trigger time T0.
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