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• W4229008593 abstract "The milestone of GW 170817-GRB 170817A-AT 2017gfo has shown that gravitational wave (GW) is produced during the merger of neutron star-neutron star/black hole and that in electromagnetic (EM) wave a gamma-ray burst (GRB) and a kilonovae (KN) are generated in sequence after the merger. Observationally, however, EM property during a merger is still unclear. Here we report a peculiar precursor in a KN-associated long GRB 211211A. The duration of the precursor is $sim$ 0.2 s, and the waiting time between the precursor and the main emission (ME) of the burst is $sim$ 1 s, which is about the same as the time interval between GW 170817 and GRB 170817A. Quasi-Periodic Oscillations (QPO) with frequency $sim$22 Hz (at $>5sigma$ significance) are found throughout the precursor, the first detection of periodic signals from any {it bona fide} GRBs. This indicates most likely that a magnetar participated in the merger, and the precursor might be produced due to a catastrophic flare accompanying with torsional or crustal oscillations of the magnetar. The strong seed magnetic field of $sim 10^{14-15}$ G at the surface of the magnetar may also account for the prolonged duration of GRB 211211A. However, it is a challenge to reconcile the rather short lifetime of a magnetar cite{kaspi2017magnetars} with the rather long spiraling time of a binary neutron star system only by gravitational wave radiation before merger." @default.
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• W4229008593 date "2022-05-04" @default.
• W4229008593 modified "2023-10-17" @default.
• W4229008593 title "The quasi-periodically oscillating precursor of a long gamma-ray burst from a binary neutron star merger" @default.
• W4229008593 doi "https://doi.org/10.48550/arxiv.2205.02186" @default.
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