Properties of the Extremely Energetic GRB 221009A from Konus-WIND and SRG/ART-XC Observations
Properties of the Extremely Energetic GRB 221009A from Konus-WIND and SRG/ART-XC Observations
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DOI：
10.3847/2041-8213/acd1eb
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发表时间：
2023-02
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通讯作者：
D. Frederiks;D. Svinkin;A. Lysenko;S. Molkov;A. Tsvetkova;M. Ulanov;A. Ridnaia;A. Lutovinov;I. Lapshov;A. Tkachenko;V. Levin
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作者：
D. Frederiks;D. Svinkin;A. Lysenko;S. Molkov;A. Tsvetkova;M. Ulanov;A. Ridnaia;A. Lutovinov;I. Lapshov;A. Tkachenko;V. Levin
本文报道了Konus-WIND（KW）和Mikhail Pavlinsky伦琴天文望远镜-X射线聚光器（ART-XC）对附近GRB 221009 A的观测和分析。GRB 221009 A是KW探测到的最亮的γ射线暴（GRB），观测时间超过28年。的提示，脉冲阶段的突发发射持续了10600秒，其次是一个稳定的幂律衰减持续超过25千秒。通过对KW和ART-XC光变曲线以及KW光谱数据的分析，我们得出了爆发的时间平均光谱峰值能量Ep为2.6 MeV，最亮发射峰处的Ep为3.0 MeV，20 keV-10 MeV的总能量通量为10.22 erg cm−2，同一波段的峰值能流为10.031 erg cm−2 s−1。观测到的巨大的能量密度和峰值通量意味着在红移z = 0.151处，各向同性能量释放E的巨大值为1.2 × 1055 erg（或太阳静止质量为6.5）和各向同性峰值光度L iso = 3.4 × 1054 erg s−1（64毫秒尺度），使GRB 221009 A成为自1997年GRB宇宙学时代开始以来观测到的最具活力和最明亮的爆发之一。爆发的各向同性能量很好地符合>300 KW长GRB的“Amati”和“Yonetoku”硬度-强度相关性，这意味着GRB 221009 A很可能是“正常”长GRB的非常坚硬，超高能版本。
We report on Konus-WIND (KW) and Mikhail Pavlinsky Astronomical Roentgen Telescope – X-ray Concentrator (ART-XC) observations and analysis of a nearby GRB 221009A, the brightest γ-ray burst (GRB) detected by KW for >28 yr of observations. The prompt, pulsed phase of the burst emission lasts for ∼600 s and is followed by a steady power-law decay lasting for more than 25 ks. From the analysis of the KW and ART-XC light curves and the KW spectral data, we derive time-averaged spectral peak energy of the burst E p ≈ 2.6 MeV, E p at the brightest emission peak ≈ 3.0 MeV, the total 20 keV–10 MeV energy fluence of ≈0.22 erg cm−2, and the peak energy flux in the same band of ≈0.031 erg cm−2 s−1. The enormous observed fluence and peak flux imply, at redshift z = 0.151, huge values of isotropic energy release E iso ≈ 1.2 × 1055 erg (or ≳6.5 solar rest mass) and isotropic peak luminosity L iso ≈ 3.4 × 1054 erg s−1 (64 ms scale), making GRB 221009A the most energetic and one of the most luminous bursts observed since the beginning of the GRB cosmological era in 1997. The isotropic energetics of the burst fit nicely both “Amati” and “Yonetoku” hardness–intensity correlations for >300 KW long GRBs, implying that GRB 221009A is most likely a very hard, super-energetic version of a “normal” long GRB.