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arXiv · 2610.39130

Harmonic brightness oscillations point to magnetar giant flares in rare short gamma-ray bursts

Run-Chao Chen·Ore Gottlieb·Bin-Bin Zhang·Yuri Levin·Dong Lai·Jun Yang·Yi-Han Iris Yin·Suo-Ning Wang
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Abstract

Kilohertz quasi-periodic oscillations (QPOs) have been observed in a few rare gamma-ray bursts (GRBs), but their physical origin remains uncertain. We reanalyze the two short GRBs with reported kilohertz QPOs, GRB 910711 and GRB 200415A, and find evidence for possible harmonic-like organization around a characteristic frequency scale near 360 hertz. The similar harmonic-like pattern in GRB 910711 and in the confirmed magnetar giant flare (MGF) event GRB 200415A, including features extending above 4 kilohertz, points to timing phenomenology on frequency scales relevant to magnetar oscillation modes. The temporal and spectral similarities between the two events and the difficulty of explaining these features in merger-driven scenarios favor an MGF-like interpretation of GRB 910711. This timing phenomenology may therefore provide an additional observational handle, complementary to spectral, temporal, and localization information, for distinguishing rare MGF-like transients from merger-driven GRBs.

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Run-Chao Chen, Ore Gottlieb, Bin-Bin Zhang, Yuri Levin, Dong Lai, Jun Yang, Yi-Han Iris Yin, Suo-Ning Wang. 2026-10-29. Harmonic brightness oscillations point to magnetar giant flares in rare short gamma-ray bursts. https://doi.org/10.1126/sciadv.aee6388

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