RJK Band Observations of the Optical Afterglow of GRB 991216
RJK Band Observations of the Optical Afterglow of GRB 991216
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GRB 991216 光学余辉的 RJK 波段观测
DOI：
10.1086/317102
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
J. Tonry
中科院分区：
文献类型：
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作者：
P. Garnavich;S. Jha;M. Pahre;K. Stanek;R. Kirshner;Michael R. Garcia;A. Szentgyorgyi;J. Tonry
本文介绍了Fred L. Whipple天文台1.2 m望远镜和夏威夷大学2.2 m望远镜对991216伽马射线爆发余辉的近红外和光学观测结果。观测范围从爆发后的15小时到3.8天不等。数据的时间行为可以用一个独立于波长的幂律衰减t-1.36±0.04来很好地描述。在修正了E(B-V) = 0.626的银河系显着变红后，光谱能量分布可以用ν-0.58±0.08的幂律很好地拟合。将红外/光学观测与钱德拉x射线天文台的测量相结合，在同步加速器冷却状态下的光谱指数为-0.8±0.1。光谱和时间幂律指数之间的比较表明，射流比简单的球形激波更符合观测结果。
We present near-infrared and optical observations of the afterglow to the gamma-ray burst 991216 obtained with the Fred L. Whipple Observatory 1.2 m telescope and the University of Hawaii 2.2 m telescope. The observations range from 15 hours to 3.8 days after the burst. The temporal behavior of the data is well described by a single power-law decay t-1.36±0.04, independent of wavelength. The optical spectral energy distribution, which is corrected for significant Galactic reddening of E(B-V) = 0.626, is well fitted by a single power law with ν-0.58±0.08. Combining the IR/optical observations with a Chandra X-Ray Observatory measurement gives a spectral index of -0.8 ± 0.1 in the synchrotron cooling regime. A comparison between the spectral and temporal power-law indices suggests that a jet is a better match to the observations than a simple spherical shock.