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Title:
Probing the nature of high-z short GRB 090426 with its early optical and X-ray afterglows
Authors:
Xin, Li-Ping; Liang, En-Wei; Wei, Jian-Yan; Zhang, Bing; Lv, Hou-Jun; Zheng, Wei-Kang; Urata, Yuji; Im, Myungshin; Wang, Jing; Qiu, Yu-Lei; Deng, Jin-Song; Huang, Kui-Yun; Hu, Jing-Yao; Jeon, Yiseul; Li, Hua-Li; Han, Xu-Hui
Affiliation:
AA(National Astronomical Observatoires, Chinese Academy of Sciences, Beijing 100012, China), AB(Department of Physics, Guangxi University, Guangxi 530004, China), AC(National Astronomical Observatoires, Chinese Academy of Sciences, Beijing 100012, China), AD(Department of Physics and Astronomy, University of Nevada, Las Vegas, Nv 89154, USA), AE(Department of Physics, Guangxi University, Guangxi 530004, China), AF(Department of Physics, University of Michigan, Ann Arbor, MI 48109, USA), AG(Institute of Astronomy and Astrophysics, Academia Sinica, PO Box 23-141, Taipei 106, Taiwan), AH(Centre for the Exploration of the Origin of the Universe, Department of Physics and Astronomy, FPRD, Seoul National University, Shillim-dong, San 56-1, Kwanak-gu, Seoul, Korea), AI(National Astronomical Observatoires, Chinese Academy of Sciences, Beijing 100012, China), AJ(National Astronomical Observatoires, Chinese Academy of Sciences, Beijing 100012, China), AK(National Astronomical Observatoires, Chinese Academy of Sciences, Beijing 100012, China), AL(Institute of Astronomy and Astrophysics, Academia Sinica, PO Box 23-141, Taipei 106, Taiwan), AM(National Astronomical Observatoires, Chinese Academy of Sciences, Beijing 100012, China), AN(Centre for the Exploration of the Origin of the Universe, Department of Physics and Astronomy, FPRD, Seoul National University, Shillim-dong, San 56-1, Kwanak-gu, Seoul, Korea), AO(National Astronomical Observatoires, Chinese Academy of Sciences, Beijing 100012, China), AP(National Astronomical Observatoires, Chinese Academy of Sciences, Beijing 100012, China)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 410, Issue 1, pp. 27-32. (MNRAS Homepage)
Publication Date:
01/2011
Origin:
WILEY
Astronomy Keywords:
gamma-ray burst: individual: GRB 090426, gamma-rays: general
Abstract Copyright:
2010 The Authors. Journal compilation 2010 RAS
DOI:
10.1111/j.1365-2966.2010.17419.x
Bibliographic Code:
2011MNRAS.410...27X

Abstract

GRB 090426 is a short-duration burst detected by Swift (? s in the observer frame and ? s in the burst frame at z= 2.609). Its host galaxy properties and some gamma-ray-related correlations are analogous to those seen in long-duration gamma-ray bursts (GRBs), which are believed to be of a massive star origin (so-called Type II GRBs). We present the results of its early optical observations with the 0.8-m Tsinghua University-National Astronomical Observatory of China Telescope (TNT) at Xinglong Observatory and the 1-m LOAO telescope at Mt Lemmon Optical Astronomy Observatory in Arizona. Our well-sampled optical afterglow light curve covers from ? to 104 s after the GRB trigger. It shows two shallow decay episodes that are likely due to energy injection, which end at ? and 7100 s, respectively. The decay slopes after the injection phases are consistent with each other (?). The X-ray afterglow light curve appears to trace the optical, although the second energy-injection phase was missed due to visibility constraints introduced by the Swift orbit. The X-ray spectral index is ? without temporal evolution. Its decay slope is consistent with the prediction of the forward shock model. Both X-ray and optical emission are consistent with being in the same spectral regime above the cooling frequency (?). The fact that ? is below the optical band from the very early epoch of the observation provides a constraint on the burst environment, which is similar to that seen in classical long-duration GRBs. We therefore suggest that death of a massive star is the possible progenitor of this short burst.
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