Optical and Near-infrared Observations of the Distant but Bright “New Year’s Burst” GRB 220101A
Optical and Near-infrared Observations of the Distant but Bright “New Year’s Burst” GRB 220101A
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DOI：
10.3847/1538-4357/ad05c8
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发表时间：
2023-03
期刊：
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通讯作者：
Zi-pei Zhu;W. Lei;D. Malesani;Shao-Yu Fu;Dongpeng Liu;Dong-Lian Xu;P. D’Avanzo;Jos'e Feliciano Agu'i Fern'
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作者：
Zi-pei Zhu;W. Lei;D. Malesani;Shao-Yu Fu;Dongpeng Liu;Dong-Lian Xu;P. D’Avanzo;Jos'e Feliciano Agu'i Fern'
高红移伽玛射线暴（GRB）对于探测早期宇宙是有用的，但到目前为止只探测到了少数候选者。在这里，我们报告了相对高红移事件GRB 220101 A的余辉的光学和近红外观测，该事件于2022年元旦触发，因此被称为“新年爆发”。利用XL2.16/BFOSC和NOT/ALFOSC获得的光谱，我们确定了爆发的红移为z = 4.615。我们发现GRB 220101 A的光学余辉是迄今为止探测到的最明亮的余辉之一。基于我们的光学和近红外数据，并结合X射线观测，我们使用Python包afterglowpy进行多波段拟合。喷流张开角限制在0.3 °4，与喷流中断时间0.7天一致。我们还确定了环爆流的密度n 0 = 0.15 cm−3，动能E K，iso = 3.5 × 1054 erg。在爆发的瞬发阶段，我们发现80 ~ 120 s的光变曲线具有“镜像”特征。这种镜像特征的物理起源尚不清楚。
High-redshift gamma-ray bursts (GRBs) are useful to probe the early Universe, but only a few candidates have been detected so far. Here, we report the optical and near-infrared observations of the afterglow of a relatively high-redshift event GRB 220101A, which was triggered on New Year’s Day of 2022, and therefore referred to as the “New Year’s burst.” With the optical spectra obtained by XL2.16/BFOSC and NOT/ALFOSC, we determine the redshift of the burst to be z = 4.615. We find that the optical afterglow of GRB 220101A is one of the most luminous ever detected. Based on our optical and near-infrared data, and combined with the X-ray observations, we perform a multiband fit with the Python package afterglowpy. The jet opening angle is constrained to ∼3.°4, which is consistent with the jet-break time at ∼0.7 day. We also determine the circumburst density of n 0 = 0.15 cm−3 and kinetic energy E K,iso = 3.5 × 1054 erg. In the prompt phase of the burst, we find a “mirror” feature in the lightcurve from 80 s to 120 s. The physical origin of such a mirror feature is unclear.