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arXiv 0812.2943astro-ph
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Swift-UVOT捕捉到了伽马射线暴最早期的紫外光谱

Swift-UVOT captures the earliest ultraviolet spectrum of a Gamma Ray Burst

N. P. M. Kuin, W. B. Landsman, M. J. Page, P. Schady, M. Still, A. A. Breeveld, M. De Pasquale, P. J. Brown, M. Carter, C. James, P. A. Curran, A. Cucciara, C. … 展开作者

N. P. M. Kuin, W. B. Landsman, M. J. Page, P. Schady, M. Still, A. A. Breeveld, M. De Pasquale, P. J. Brown, M. Carter, C. James, P. A. Curran, A. Cucciara, C. Gronwall, S. T. Holland, E. A. Hoversten, S. Hunsberger, T. Kennedy, S. Koch, H. Lamoureux, F. E. Marshall, S. R. Oates, A. Parsons, D. Palmer, P. Roming, P. J. Smith

摘要:

我们提出了有史以来最早的紫外光谱的伽马射线暴(GRB)所观察到的Swift-UVOT。GRB 081203 A光谱被观察50秒,其中UV棱镜在Swift-BAT触发之后251秒开始,此时GRB为μ ~13.4等并且仍上升到其峰值光学亮度。紫外棱镜光谱显示出衰减的Ly-alpha线,Ly-beta,以及在红移z = 2.05 +/- 0.01处的莱曼连续谱断裂。莱曼吸收的模型拟合意味着log N(HI)= 22.0 +/- 0.2 cm-2,这是具有阻尼Ly-alpha吸收体的GRB宿主星系的典型特征。对GRB 081203 A的观测表明,对于亮度超过v ~14等且0.5 < z < 3.5的GRB,UVOT将能够提供红移,并在Swift-BAT触发后4-6分钟内探测阻尼的Ly-alpha吸收体。

英文摘要:

We present the earliest ever ultraviolet spectrum of a gamma-ray burst (GRB) as observed with the Swift-UVOT. The GRB 081203A spectrum was observed for 50 seconds with the UV grism starting 251 seconds after the Swift-BAT trigger when the GRB was of u ~13.4 mag and still rising to its peak optical brightness. The UV grism spectrum shows a damped Ly-alpha line, Ly-beta, and the Lyman continuum break at a redshift z = 2.05 +/- 0.01. A model fit to the Lyman absorption implies log N(HI) = 22.0 +/- 0.2 cm-2, which is typical for GRB host galaxies with damped Ly-alpha absorbers. This observation of GRB 081203A demonstrates that for GRBs brighter than v ~14 mag and with 0.5 < z < 3.5 the UVOT will be able to provide redshifts, and probe for damped Ly-alpha absorbers within 4-6 minutes from the time of the Swift-BAT trigger.

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