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arXiv 2009.13614astro-ph.HE
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模拟GRB 180325 A的瞬发光发射:从光到γ射线的尖峰的演变

Modelling the prompt optical emission of GRB 180325A: the evolution of a spike from the optical to gamma-rays

Rosa L. Becerra, Fabio De Colle, Jorge Cantó, Susana Lizano, Ricardo F. González, Jonathan Granot, Alain Klotz, Alan M. Watson, Nissim Fraija, Anabella T. Araud… 展开作者

Rosa L. Becerra, Fabio De Colle, Jorge Cantó, Susana Lizano, Ricardo F. González, Jonathan Granot, Alain Klotz, Alan M. Watson, Nissim Fraija, Anabella T. Araudo, Eleonora Troja, Jean Luc Atteia, William H. Lee, Damien Turpin, Joshua S. Bloom, Michael Boer, Nathaniel R. Butler, José J. González, Alexander S. Kutyrev, J. Xavier Prochaska, Enrico Ramírez-Ruíz, Michael G. Richer, Carlos G. Román Zúñiga

摘要:

从瞬发到余辉发射的转变是伽马射线暴(GRB)中最令人兴奋但最不为人所知的阶段之一。伽玛暴中的光辐射、X射线辐射和γ射线辐射之间的相关性已被探索,试图回答最早的光辐射是否来自内部和/或外部冲击。我们提出的光学光度观测GRB 180325 A收集的TAROT和RATIR地面望远镜。这些观测结果显示了两个强的闪光,在$\sim50\;$ s和$\sim120\;$ s处具有单独的峰值,随后是时间上扩展的光发射。我们还介绍了GRB 180325 A的X射线和伽马射线观测,由突发警报望远镜(BAT)和X射线望远镜(XRT)探测到,尼尔·盖尔斯斯威夫特天文台,这两个观测到一个窄的闪光在$\sim80\;$ s。我们表明,即时伽马射线和X射线早期发射股类似的时间和光谱特征与内部耗散内的相对论流出(例如,通过内部冲击或磁重联)一致,而早期的光学闪光可能产生的反向冲击,减速喷出物,因为它扫了外部介质。

英文摘要:

The transition from prompt to the afterglow emission is one of the most exciting and least understood phases in gamma-ray bursts (GRBs). Correlations among optical, X-ray and gamma-ray emission in GRBs have been explored, to attempt to answer whether the earliest optical emission comes from internal and/or external shocks. We present optical photometric observations of GRB 180325A collected with the TAROT and RATIR ground-based telescopes. These observations show two strong optical flashes with separate peaks at $\sim50\;$s and $\sim120\;$s, followed by a temporally extended optical emission. We also present X-rays and gamma-ray observations of GRB 180325A, detected by the Burst Alert Telescope (BAT) and X-ray Telescope (XRT), on the Neil Gehrels Swift observatory, which both observed a narrow flash at $\sim80\;$s. We show that the prompt gamma- and X-ray early emission shares similar temporal and spectral features consistent with internal dissipation within the relativistic outflow (e.g. by internal shocks or magnetic reconnection), while the early optical flashes are likely generated by the reverse shock that decelerates the ejecta as it sweeps up the external medium.

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