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arXiv 2302.13383astro-ph.HE
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来自Konus-WIND和SRG/ART-XC观测的极高能GRB 221009A的性质

Properties of the extremely energetic GRB~221009A from Konus-WIND and SRG/ART-XC observations

D. Frederiks, D. Svinkin, A. L. Lysenko, S. Molkov, A. Tsvetkova, M. Ulanov, A. Ridnaia, A. A. Lutovinov, I. Lapshov, A. Tkachenko, V. Levin

AI总结:

基于Konus-WIND和SRG/ART-XC观测,本研究分析了极亮伽马射线暴GRB 221009A,测得其极高能量与光度,证实其为“正常”长GRB的超高能版本。

摘要:

我们报告了对附近GRB 221009A的Konus-Wind(KW)和Mikhail Pavlinsky ART-XC望远镜观测与分析,这是KW在超过28年的观测中探测到的最亮的伽马射线暴(GRB)。该爆发的瞬时脉冲阶段持续约600 s,随后是持续超过25 ks的稳定幂律衰减。通过对KW和ART-XC光变曲线及KW光谱数据的分析,我们得出该爆发的时间平均光谱峰值能量Ep≈2.6 MeV,最亮发射峰处的Ep≈3.0 MeV,20 keV--10 MeV的总能量注量约为0.22 erg cm$^{-2}$,以及同一能段内的峰值能通量约为0.03 erg cm$^{-2}$ s$^{-1}$。巨大的观测注量和峰值通量意味着,在红移z=0.151处,其各向同性能量释放Eiso≈1.2×10^55 erg(或≳6.5个太阳静止质量),各向同性峰值光度Liso≈3.4×10^54 erg s$^{-1}$(64 ms尺度),这使得GRB 221009A成为自1997年GRB宇宙学时代开始以来观测到的能量最高且光度最高的爆发之一。该爆发的各向同性能量很好地符合了300多个KW长GRB的“Amati”和“Yonetoku”硬度-强度相关性,表明GRB 221009A极有可能是“正常”长GRB的一个极硬、超高能版本。

英文摘要:

We report on Konus-Wind (KW) and Mikhail Pavlinsky ART-XC telescope observations and analysis of a nearby GRB 221009A, the brightest $γ$-ray burst (GRB) detected by KW for $>$28 years of observations. The prompt, pulsed phase of the burst emission lasts for $\sim 600$ 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 $E_p\approx 2.6$ MeV, $E_p$ at the brightest emission peak $\approx 3.0$ MeV, the total 20 keV--10 MeV energy fluence of $\approx0.22$ erg cm$^{-2}$, and the peak energy flux in the same band of $\approx 0.03$ erg cm$^{-2}$ s$^{-1}$. The enormous observed fluence and peak flux imply, at redshift $z=0.151$, huge values of isotropic energy release $E_{\mathrm{iso}}\approx1.2\times10^{55}$ erg (or $\gtrsim 6.5$ solar rest mass) and isotropic peak luminosity $L_{\mathrm{iso}}\approx3.4\times10^{54}$ erg s$^{-1}$ (64 ms scale), making GRB 221009A the most energetic and one 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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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