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Autori principali: Xiao, Shuo, Zhang, Yan-Qiu, Zhu, Zi-Pei, Xiong, Shao-Lin, Gao, He, Xu, Dong, Zhang, Shuang-Nan, Peng, Wen-Xi, Li, Xiao-Bo, Zhang, Peng, Lu, Fang-Jun, Lin, Lin, Liu, Liang-Duan, Zhang, Zhen, Ge, Ming-Yu, Tuo, You-Li, Xue, Wang-Chen, Fu, Shao-Yu, Liu, Xing, Liu, Jin-Zhong, Li, An, Wang, Tian-Cong, Zheng, Chao, Wang, Yue, Jiang, Shuai-Qing, Li, Jin-Da, Liu, Jia-Cong, Cao, Zhou-Jian, Luo, Xi-Hong, Yang, Jiao-Jiao, Yi, Shu-Xu, Wang, Xi-Lu, Cai, Ce, Yi, Qi-Bin, Zhao, Yi, Xie, Sheng-Lun, Li, Cheng-Kui, Luo, Qi, Song, Li-Ming, Zhang, Shu, Qu, Jin-Lu, Liu, Cong-Zhan, Li, Xu-Fang, Xu, Yu-Peng, Li, Ti-Pei
Natura: Preprint
Pubblicazione: 2022
Soggetti:
High Energy Astrophysical Phenomena
Accesso online:https://arxiv.org/abs/2205.02186
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Sommario:
  • The milestone discovery of GW 170817-GRB 170817A-AT 2017gfo has shown that gravitational wave (GW) could be produced during the merger of neutron star-neutron star/black hole and that in electromagnetic (EM) wave a gamma-ray burst (GRB) and a kilonova (KN) are generated in sequence after the merger. Observationally, however, EM property before the merger phase is still unclear. Here we report a peculiar precursor in a KN-associated long-duration GRB 211211A, providing evidence of the EM before the merger. This precursor lasts $\sim$ 0.2 s, and the waiting time between the precursor and the main burst is $\sim$ 1 s, comparable to that between GW 170817 and GRB 170817A. The spectrum of the precursor could be well fit with a non-thermal cutoff power-law model instead of a blackbody. Especially, a $\sim$22 Hz Quasi-Periodic Oscillation candidate ($\sim 3σ$) is detected in the precursor. These temporal and spectral properties indicate that this precursor is probably produced by a catastrophic flare accompanying with magnetoelastic or crustal oscillations of a magnetar in binary compact merger. The strong magnetic field of the magnetar can also account for the prolonged duration of GRB 211211A. However, it poses a challenge to reconcile the rather short lifetime of a magnetar with the rather long spiraling time of a binary neutron star system only by the GW radiation before merger.

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