伽玛暴(Gamma-Ray Burst)笔记。记录有关伽玛暴的新文章,另外也包括看的老文章、自己的想法、以及跟天文相关的一些东西。 Feel free to leave me a message by comments or by email.

星期六, 十二月 20, 2008

Kuin 2008 UVOT对GRB081203A的观测

主要内容:
观测了一些氢线. 可以定红移为2. 对于V band星等亮于14, 红移在0.5到3.5之间的, UVOT就可以通过谱线定红移. (氢的Ly-alpha, Ly-break)

精彩摘抄:
UVOT的光变, 很平滑, 应该是余辉. 可以和X-ray比较一下.

文章信息:

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Title:
Swift-UVOT captures the earliest ultraviolet spectrum of a Gamma Ray Burst
Authors:
Kuin, N. P. M.; Landsman, W.; Page, M. J.; Schady, P.; Still, M.; Breeveld, A. A.; De Pasquale, M.; Brown, P. J.; Carter, M.; James, C.; Curran, P. A.; Cucciara, A.; Gronwall, C.; Holland, S. T.; Hoversten, E.; Hunsberger, S.; Kennedy, T.; Koch, S.; Lamoureux, H.; Marshall, F. E.; Oates, S. R.; Parsons, A.; Palmer, D.; Roming, P.; Smith, P. J.
Publication:
eprint arXiv:0812.2943
Publication Date:
12/2008
Origin:
ARXIV
Keywords:
Astrophysics
Comment:
4 pages, 4 figures, submitted to MNRAS letters
Bibliographic Code:
2008arXiv0812.2943K

Abstract

We present the earliest ever ultraviolet spectrum of a gamma-ray burst (GRB) as observed with the Swift-UVOT. The spectrum of GRB 081203A 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 <> Bibtex entry for this abstract Preferred format for this abstract (see Preferences)

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