GRB 210619B optical afterglow polarization

GRB 210619B optical afterglow polarization
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GRB 210619B 光学余辉偏振

DOI:
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发表时间:
2022
期刊:
Astronomy & Astrophysics
影响因子:
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通讯作者:
L. F. T. Kataivatis
L. F. T. Kataivatis
中科院分区:
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文献类型:
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作者:
N. Mandarakas;D. Blinov;D. R. Aguilera;S. Romanopoulos;V. Pavlidou;K. Tassis;J. Antoniadis;S. Kiehlmann;A. Lychoudis;L. F. T. Kataivatis

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我们用光学偏振法报道了极亮长伽马射线爆发 GRB~210619B 的后续情况。我们使用 Skinakas 天文台的 RoboPol 仪器,在爆发后约 5967 - 8245 秒的时间窗口内对 GRB~210619B 在 SDSS-r 波段的光学余辉进行了光偏振观测。我们报告了在偏振角 $EVPA=8pm6^circ$ 下对偏振 $P=1.5pm0.3$ 的 $5,sigma$ 检测。我们发现,在观察过程中,极化可能是恒定的。这些值针对银河系星际介质引起的偏振进行了校正,并且宿主引起的偏振可能可以忽略不计。因此,我们引用的偏振是GRB余辉所固有的。
We report on the follow-up of the extremely bright long gamma-ray burst GRB~210619B with optical polarimetry. We conducted optopolarimetric observations of the optical afterglow of GRB~210619B in the SDSS-r band in the time window ~ 5967 - 8245 seconds after the burst, using the RoboPol instrument at the Skinakas observatory. We report a $5,sigma$ detection of polarization $P=1.5pm0.3$ at polarization angle $EVPA=8pm6^circ$. We find that during our observations the polarization is likely constant. These values are corrected for polarization induced by the interstellar medium of the Milky Way and host-induced polarization is likely negligible. Thus the polarization we quote is intrinsic to the GRB afterglow.