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Probing the nature of high-z short GRB 090426 with its early optical and X-ray afterglows
| Content Provider | Semantic Scholar |
|---|---|
| Author | Xin, Libiao Liang, Ensi Wei, Jingle Zhang, Bing Lv, Huangfei Zheng, Wangzhi Urata, Yuji Im, Myungshin Wang, Jing Qiu, Yu-Lei Deng, Jin-Song Hu, Jennifer Li, Hua-Li Han, Xuchen |
| Copyright Year | 2010 |
| Abstract | GRB 090426 is a short-duration burst detected by Swift (T90 ∼ 1.28 s in the observer frame and T90 ∼ 0.33 s in the burst frame at z = 2.609). Its host galaxy properties and some gamma-rayrelated 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 wellsampled optical afterglow light curve covers from ∼90 to 104 s after the GRB trigger. It shows two shallow decay episodes that are likely due to energy injection, which end at ∼230 and 7100 s, respectively. The decay slopes after the injection phases are consistent with each other (α " 1.22). 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 βX ∼ 1.0 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 (νc). The fact that νc 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 |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://www.physics.unlv.edu/~bzhang/xin11.pdf |
| Alternate Webpage(s) | https://deepblue.lib.umich.edu/bitstream/handle/2027.42/79209/j.1365-2966.2010.17419.x.pdf;jsessionid=3F93048F41FBF15986D95A57FBF5A17F?sequence=1 |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Active galactic nucleus Cessation of life Computer cooling Cool - action Diagnostic radiologic examination Fiber-optic communication GUCY2C protein, human GZMB wt Allele Gamma correction Interferon Type II Scott R. Lemmon Shock Swift (programming language) Trinitrotoluene X-Ray (Amazon Kindle) slope |
| Content Type | Text |
| Resource Type | Article |
