arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0708.3553astro-ph
收藏

短GRB 061201的瞬发和余辉发射研究

A study of the prompt and afterglow emission of the Short GRB 061201

G. Stratta, P. D'Avanzo, S. Piranomonte, S. Cutini, B. Preger, M. Perri, M. L. Conciatore, S. Covino, L. Stella, D. Guetta, F. E. Marshall, S. T. Holland, M. St… 展开作者

G. Stratta, P. D'Avanzo, S. Piranomonte, S. Cutini, B. Preger, M. Perri, M. L. Conciatore, S. Covino, L. Stella, D. Guetta, F. E. Marshall, S. T. Holland, M. Stamatikos, C. Guidorzi, V. Mangano, L. A. Antonelli, D. Burrows, S. Campana, M. Capalbi, G. Chincarini, G. Cusumano, V. D'Elia, P. A. Evans, F. Fiore, D. Fugazza, P. Giommi, J. P. Osborne, V. La Parola, T. Mineo, A. Moretti, K. L. Page, P. Romano, G. Tagliaferri

摘要:

到目前为止,我们对短持续时间伽马射线暴的固有性质的认识,仅仅依赖于少数几个已经获得了距离估计和余辉的扩展的多波长监测的例子。我们对短伽玛暴061201进行了多波长观测,目的是估计它的距离并研究它的性质。我们进行了光谱和时序分析的提示和余辉发射,并讨论了标准火球模型的背景下的结果。在爆发触发后约40分钟,在X射线光变曲线中观察到明显的时间中断。我们发现,X射线余辉的光谱和定时行为与所观察到的破裂的射流起源是一致的,尽管光学数据不能明确证实这一点,其他情况也是可能的。在光学余辉消失后,没有发现低至R~26等的下伏宿主星系。因此,对于这个爆发,没有安全的红移可以测量。最近的星系位于z=0.111,显示出恒星形成活动的证据。我们讨论了GRB 061201与该星系以及与ACO S 995星系团的成协关系,GRB 061201的源分别位于角距离17“和8.5”处。我们还测试了一个可能的未被发现的,位置一致的星系在z~1的协会。在所有这些情况下,在射流解释中,我们发现射流张开角为1-2度。

英文摘要:

Our knowledge of the intrinsic properties of short duration Gamma-Ray Bursts has relied, so far, only upon a few cases for which the estimate of the distance and an extended, multiwavelength monitoring of the afterglow have been obtained. We carried out multiwavelength observations of the short GRB 061201 aimed at estimating its distance and studying its properties. We performed a spectral and timing analysis of the prompt and afterglow emission and discuss the results in the context of the standard fireball model. A clear temporal break was observed in the X-ray light curve about 40 minutes after the burst trigger. We find that the spectral and timing behaviour of the X-ray afterglow is consistent with a jet origin of the observed break, although the optical data can not definitively confirm this and other scenarios are possible. No underlying host galaxy down to R~26 mag was found after fading of the optical afterglow. Thus, no secure redshift could be measured for this burst. The nearest galaxy is at z=0.111 and shows evidence of star formation activity. We discuss the association of GRB 061201 with this galaxy and with the ACO S 995 galaxy cluster, from which the source is at an angular distance of 17'' and 8.5', respectively. We also test the association with a possible undetected, positionally consistent galaxy at z~1. In all these cases, in the jet interpretation, we find a jet opening angle of 1-2 degrees.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑