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arXiv 0712.3585astro-ph
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GRB 070201:M31中可能存在软Gamma Ray中继器

GRB 070201: A possible Soft Gamma Ray Repeater in M31

E. O. Ofek, M. Muno, R. Quimby, S. R. Kulkarni, H. Stiele, W. Pietsch, E. Nakar, A. Gal-Yam, A. Rau, P. B. Cameron, S. B. Cenko, M. M. Kasliwal, D. B. Fox, P. C… 展开作者

E. O. Ofek, M. Muno, R. Quimby, S. R. Kulkarni, H. Stiele, W. Pietsch, E. Nakar, A. Gal-Yam, A. Rau, P. B. Cameron, S. B. Cenko, M. M. Kasliwal, D. B. Fox, P. Chandra, A. K. H. Kong, R. Barnard

摘要:

伽马射线暴(GRB)070201是由行星间网络(IPN)探测到的一个明亮的短持续时间硬谱GRB。它的误差四边形,其面积为0.124平方米。度,与附近的M31(仙女座)星系的一些突出的螺旋臂相交。考虑到这个伽玛暴的性质,以及LIGO数据反对M31中的致密双星合并起源的事实,这个伽玛暴是河外软伽马射线中继器(SGR)巨型耀斑的绝佳候选者,能量为1.4x10^45 erg。在爆发后10.6小时,对M31的ROTSE-IIIb可见光观测进行了分析,覆盖了42%的GRB误差区域,没有发现任何光学瞬变,直到极限星等17.1。我们检查了GRB误差四边形和M31交叉点的档案和专有XMM-牛顿X射线观测,在爆发前大约四周获得,以寻找周期性可变的X射线源。没有探测到SGR或异常X射线脉冲星(AXP)候选者(周期范围为1至20秒)。我们讨论了通过确定其周期性X射线光变曲线来探测河外SGRs/AXP的可能性。我们的模拟表明,探测到已知的银河系SGR/AXP之一的周期性X射线信号的概率,如果放置在M31,是约10%(50%),使用50 ks(2 Ms)XMM-牛顿曝光。

英文摘要:

The gamma-ray burst (GRB) 070201 was a bright short-duration hard-spectrum GRB detected by the Inter-Planetary Network (IPN). Its error quadrilateral, which has an area of 0.124 sq. deg, intersects some prominent spiral arms of the nearby M31 (Andromeda) galaxy. Given the properties of this GRB, along with the fact that LIGO data argues against a compact binary merger origin in M31, this GRB is an excellent candidate for an extragalactic Soft Gamma-ray Repeater (SGR) giant flare, with energy of 1.4x10^45 erg. Analysis of ROTSE-IIIb visible light observations of M31, taken 10.6 hours after the burst and covering 42% of the GRB error region, did not reveal any optical transient down to a limiting magnitude of 17.1. We inspected archival and proprietary XMM-Newton X-ray observations of the intersection of the GRB error quadrilateral and M31, obtained about four weeks prior to the outburst, in order to look for periodic variable X-ray sources. No SGR or Anomalous X-ray Pulsar (AXP) candidates (periods in range 1 to 20 s) were detected. We discuss the possibility of detecting extragalactic SGRs/AXPs by identifying their periodic X-ray light curves. Our simulations suggest that the probability of detecting the periodic X-ray signal of one of the known Galactic SGRs/AXPs, if placed in M31, is about 10% (50%), using 50 ks (2 Ms) XMM-Newton exposures.

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