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arXiv 0712.2239astro-ph
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走得远,走得深:用LBT寻找雨燕时代GRB的光学喷射中断

Go Long, Go Deep: Finding Optical Jet Breaks for Swift-Era GRBs with the LBT

X. Dai, P. M. Garnavich, J. L. Prieto, K. Z. Stanek, C. S. Kochanek, J. Bechtold, N. Bouche, P. Buschkamp, E. Diolaiti, X. Fan, E. Giallongo, R. Gredel, J. M. H… 展开作者

X. Dai, P. M. Garnavich, J. L. Prieto, K. Z. Stanek, C. S. Kochanek, J. Bechtold, N. Bouche, P. Buschkamp, E. Diolaiti, X. Fan, E. Giallongo, R. Gredel, J. M. Hill, L. Jiang, C. McClellend, P. Milne, F. Pedichini, R. W. Pogge, R. Ragazzoni, J. Rhoads, R. Smareglia, D. Thompson, R. M. Wagner

摘要:

利用8.4米大双筒望远镜,我们观测了爆发后2.8小时到30.8天的6次GRB余辉,系统地研究了余辉的后期行为,包括喷流破裂、耀斑和超新星碰撞。我们发现了5个余辉与斯隆r'的幅度从23.0-26.3马格。我们的观察深度使我们能够延长时间基线测量射流休息的另一个十年的时间尺度。我们发现了两个喷流断裂和第三个候选者,所有这些都是无法检测到没有深,晚时间光学观测。在其他三种情况下,我们没有检测到喷流断裂,因为来自宿主星系光的污染,超新星隆起的存在,或者光学余辉的内在模糊。这表明伽玛暴被准直的基本图像仍然有效,斯威夫特喷流断裂的明显缺乏是由于余辉光变曲线采样不佳,特别是在后期。

英文摘要:

Using the 8.4m Large Binocular Telescope, we observed six GRB afterglows from 2.8 hours to 30.8 days after the burst triggers to systematically probe the late time behaviors of afterglows including jet breaks, flares, and supernova bumps. We detected five afterglows with Sloan r' magnitudes ranging from 23.0-26.3 mag. The depth of our observations allows us to extend the temporal baseline for measuring jet breaks by another decade in time scale. We detected two jet breaks and a third candidate, all of which are not detectable without deep, late time optical observations. In the other three cases, we do not detect the jet breaks either because of contamination from the host galaxy light, the presence of a supernova bump, or the intrinsic faintness of the optical afterglow. This suggests that the basic picture that GRBs are collimated is still valid and that the apparent lack of Swift jet breaks is due to poorly sampled afterglow light curves, particularly at late times.

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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