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arXiv 0712.2186astro-ph
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斯威夫特时代伽马射线暴的余辉。I.比较雨燕前和雨燕时代的长/软(II型)GRB光学余辉

The Afterglows of Swift-era Gamma-Ray Bursts. I. Comparing pre-Swift and Swift era Long/Soft (Type II) GRB Optical Afterglows

D. A. Kann, S. Klose, B. Zhang, D. Malesani, E. Nakar, A. Pozanenko, A. C. Wilson, N. R. Butler, P. Jakobsson, S. Schulze, M. Andreev, L. A. Antonelli, I. F. Bi… 展开作者

D. A. Kann, S. Klose, B. Zhang, D. Malesani, E. Nakar, A. Pozanenko, A. C. Wilson, N. R. Butler, P. Jakobsson, S. Schulze, M. Andreev, L. A. Antonelli, I. F. Bikmaev, V. Biryukov, M. Böttcher, R. A. Burenin, J. M. Castro Cerón, A. J. Castro-Tirado, G. Chincarini, B. E. Cobb, S. Covino, P. D'Avanzo, V. D'Elia, M. Della Valle, A. de Ugarte Postigo, Yu. Efimov, P. Ferrero, D. Fugazza, J. P. U. Fynbo, M. Gålfalk, F. Grundahl, J. Gorosabel, S. Gupta, S. Guziy, B. Hafizov, J. Hjorth, K. Holhjem, M. Ibrahimov, M. Im, G. L. Israel, M. Jeĺinek, B. L. Jensen, R. Karimov, I. M. Khamitov, Ü. Kızıloǧlu, E. Klunko, P. Kubánek, A. S. Kutyrev, P. Laursen, A. J. Levan, F. Mannucci, C. M. Martin, A. Mescheryakov, N. Mirabal, J. P. Norris, J. -E. Ovaldsen, D. Paraficz, E. Pavlenko, S. Piranomonte, A. Rossi, V. Rumyantsev, R. Salinas, A. Sergeev, D. Sharapov, J. Sollerman, B. Stecklum, L. Stella, G. Tagliaferri, N. R. Tanvir, J. Telting, V. Testa, A. C. Updike, A. Volnova, D. Watson, K. Wiersema, D. Xu

摘要:

我们已经收集了光学光度学数据从文献上的大样本雨燕时代的伽马射线暴(GRB)余辉,包括GRB到2009年9月,共76 GRB,并提出了额外的三个前雨燕GRB不包括在早期的样本。此外,我们还公布了总共42个伽玛暴余辉的840个新的测光数据点,包括伽玛暴050319,050408,050802,050820 A,050922 C,060418,080413 A和080810的大型数据集。我们分析了样本中所有GRB的光变曲线,并获得了具有最佳数据质量的样本的光谱能量分布,使我们能够估计宿主星系的灭绝。我们将余辉光变曲线转换成经消隐校正的z=1系统,并将它们的光度与雨燕前的余辉样品进行了比较。以前的研究表明,伽玛暴余辉在光度空间中呈双峰分布,并且是成团分布,这一结果被较大的样本所削弱。我们发现两个余辉样本(雨燕时代和雨燕之前)的光度分布非常相似,并且我们无法估计消光的子样本比主样本更暗,可以通过假设中等数量的视线主机消光来解释。我们推导出的辐射热各向同性的能量在我们的样本中的所有伽玛暴,并发现只有一个暂定的相关性的即时能量释放和光学余辉光度在一天后的伽玛暴在z=1系统。一个比较研究的光学亮度的伽玛射线暴余辉与阶梯光谱(这表明了大量的前景吸收系统)和那些没有揭示没有迹象表明,前者是统计上显着更明亮。(节略)

英文摘要:

We have gathered optical photometry data from the literature on a large sample of Swift-era gamma-ray burst (GRB) afterglows including GRBs up to September 2009, for a total of 76 GRBs, and present an additional three pre-Swift GRBs not included in an earlier sample. Furthermore, we publish 840 additional new photometry data points on a total of 42 GRB afterglows, including large data sets for GRBs 050319, 050408, 050802, 050820A, 050922C, 060418, 080413A and 080810. We analyzed the light curves of all GRBs in the sample and derived spectral energy distributions for the sample with the best data quality, allowing us to estimate the host galaxy extinction. We transformed the afterglow light curves into an extinction-corrected z=1 system and compared their luminosities with a sample of pre-Swift afterglows. The results of a former study, which showed that GRB afterglows clustered and exhibited a bimodal distribution in luminosity space, is weakened by the larger sample. We found that the luminosity distribution of the two afterglow samples (Swift-era and pre-Swift) are very similar, and that a subsample for which we were not able to estimate the extinction, which is fainter than the main sample, can be explained by assuming a moderate amount of line-of-sight host extinction. We derived bolometric isotropic energies for all GRBs in our sample, and found only a tentative correlation between the prompt energy release and the optical afterglow luminosity at one day after the GRB in the z=1 system. A comparative study of the optical luminosities of GRB afterglows with echelle spectra (which show a high number of foreground absorbing systems) and those without reveals no indication that the former are statistically significantly more luminous. (abridged)

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