Xin 2009 GRB 070518余辉的观测

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Title:		GRB 070518: a gamma-ray burst with optically dim luminosity
Authors:		Xin, L. P.; Zheng, W. K.; Wang, J.; Deng, J. S.; Urata, Y.; Qiu, Y. L.; Huang, K. Y.; Hu, J. Y.; Wei, J. Y.
Affiliation:		AA(National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China; Graduate School of Chinese Academy of Sciences, Beijing 100049, China), AB(National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China; Graduate School of Chinese Academy of Sciences, Beijing 100049, China), AC(National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China), AD(National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China), AE(Academia Sinica Institute of Astronomy and Astrophysics, Taipei 106, Taiwan, Republic of China; Department of Physics, Saitama University, Shimo-Okubo, Saitama, 338-8570, Japan; Institute of Astronomy, National Central University, Chung-Li 32054, Taiwan, Republic of China), AF(National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China), AG(Academia Sinica Institute of Astronomy and Astrophysics, Taipei 106, Taiwan, Republic of China), AH(National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China), AI(National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China)
Publication:		Monthly Notices of the Royal Astronomical Society, Volume 401, Issue 3, pp. 2005-2011. (MNRAS Homepage)
Publication Date:		01/2010
Origin:		WILEY
MNRAS Keywords:		gamma-rays: bursts, gamma-rays: observations
DOI:		10.1111/j.1365-2966.2009.15788.x
Bibliographic Code:		2010MNRAS.401.2005X

Abstract

We present our optical observations of the GRB 070518 afterglow obtained at the 0.8-m Tsinghua University-National Astronomical Observatory of China Telescope (TNT) at Xinglong Observatory. Our follow-up observations were performed from 512 s after the burst trigger. With the upper limit of redshift ~0.7, GRB 070518 is found to be an optically dim burst. The spectra indices β_ox of optical to X-ray are slightly larger than 0.5, which implies that the burst might be a dark burst. The extinction A_V of the host galaxy is 3.2 mag, inferred from the X-ray hydrogen column density with Galactic extinction law, and 0.3 mag with the Small Magellanic Cloud extinction law. Also, it is similar to three other low-redshift optically dim bursts, which belong to X-ray rich gamma-ray bursts or X-ray flashes and have mid-term duration (T₉₀ < 10, except for GRB 070419A, T₉₀ = 116 s). Moreover, its R-band afterglow flux is well fitted by a single power law with an index of 0.87. The optical afterglow and the X-ray afterglow in the normal segment might have the same mechanism, as they are consistent with the prediction of the classical external shock model. Besides, GRB 070518 agrees with the Amati relation under reasonable assumptions. The Ghirlanda relation is also tested with the burst.

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