FRBs are a newly discovered class of extragalactic radio transients characterised by their high energy and short-duration (~$μ$s-ms)[1]. Their elusive physical origin remains a subject of ongoing research, with magnetars emerging as leading candidates[2],[3]. Previous studies have employed various methodologies to address the FRB origin problem, including demographic analyses of FRB host galaxies and their local environments[4]-[6], assessments of FRB rate evolution with redshift[7]-[9], and searches for proposed multi-messenger FRB counterparts[10]. However, these studies are susceptible to significant biases stemming from unaccounted radio and optical selection effects. Here we present empirical evidence for a substantial selection bias against detecting FRBs in galaxies with large inclination angles (edge-on) using a sample of hosts identified for FRBs discovered by untargeted surveys. This inclination-related bias likely leads to a significant underestimation (by about a factor of two) of the FRB rates reported in the literature and disfavours globular clusters as the dominant origin of FRB sources, as previously speculated[6]. These conclusions have important implications for FRB progenitor models and targeted FRB follow-up strategies. We further investigate the impact of this bias on the relative rate of FRBs in different host environments. Our analysis suggests that scattering in FRB hosts is likely responsible for the observed bias[11],[12]. However, a larger sample of localised FRBs is required to robustly quantify its contribution in the inclination-related selection bias.
A new fast radio burst in the datasets containing the Lorimer burst
利用Parkes 64 m口径射电望远镜的多波束接收机，在1.4GHz的麦哲伦云观测资料中，发现了一个新的快速射电暴（FRB~010312）。这些数据集包括洛里默爆发（FRB~010724），它早于日期，我们也重新检测。新的爆发具有更高的色散测量值1187 cm $^{-3}$ pc。该爆发是迄今为止发现的最广泛的爆发之一，是已知的第二早的FRB，也是第九个发现的分散测量值大于1000 cm $^{-3}\,$ pc的FRB。我们的发现表明，在现有的帕克斯数据档案中可能还有更多的爆发事件。
Piggyback search for fast radio bursts using Nanshan 26m and Kunming 40m radio telescopes -- I. Observing and data analysis systems, discovery of a mysterious peryton
GECAM discovery of a peculiar magnetar X-ray burst (MXB 221120) from SGR J1935+2154 associated with a fast radio burst
State Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences（中国科学院高能物理研究所粒子天体物理国家重点实验室）；University of Chinese Academy of Sciences, Chinese Academy of Sciences（中国科学院大学）；College of Physics and Hebei Key Laboratory of Photophysics Research and Application, Hebei Normal University（河北师范大学物理学院河北省光物理研究与应用重点实验室）；College of Electronic and Information Engineering, Tongji University（同济大学电子与信息工程学院）；Department of Nuclear Science and Technology, School of Energy and Power Engineering, Xi’an Jiaotong University（西安交通大学能源与动力工程学院核科学与技术系）；Yunnan Observatories, Chinese Academy of Sciences（中国科学院云南天文台）；Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences（中国科学院天体结构与演化重点实验室）；Department of Astronomy, Peking University（北京大学天文学系）；National Astronomical Observatories, Chinese Academy of Sciences（中国科学院国家天文台）；Beijing Laser Acceleration Innovation Center, Huairou, Beijing（北京激光加速创新中心）；School of Physical Science and Technology, Southwest Jiaotong University（西南交通大学物理科学与技术学院）；Institute of High Energy Physics, Chinese Academy of Sciences（中国科学院高能物理研究所）；School of Physics and Electronic Science, Guizhou Normal University（贵州师范大学物理与电子科学学院）；Guizhou Provincial Key Laboratory of Radio Astronomy and Data Processing, Guizhou Normal University（贵州师范大学贵州省射电天文与数据处理重点实验室）；Institute of Astrophysics, Central China Normal University（华中师范大学天体物理研究所）
First Discovery of a Fast Radio Burst at 350 MHz by the GBNCC Survey
本文报道了绿岸北天帽脉冲星巡天首次发现的快速射电暴（FRB 20200125 A）。FRB 20200125 A是在银河系纬度58.43度被探测到的，其色散测量值为179 pc cm $^{-3}$，而电子密度模型预测沿着这条视线的最大银河系贡献为25 pc cm $^{-3}$。此外，没有明显的银河系前景源的电离气体，可以解释过量的DM是可见的，在多波长调查的这一地区。这表明源是河外的。主星系的最大红移是$z_{max}=0.17$，对应的最大同向运动距离约为750 Mpc。FRB 20200125A的测量峰值通量密度为0.37焦耳，我们测量的脉冲宽度为3.7毫秒，与在较高频率下观察到的FRB宽度分布一致。基于这种检测，并假设FRB的欧几里德通量密度分布，我们计算出$^{-1}$天$^{-1}$的$3.4^{+15.4}_{-3.3} \times 10^3$ FRB在350 MHz的全天速率高于0.42 Jy的峰值通量密度，对于具有5 ms的固有宽度的未散射脉冲，与在更高频率下报告的速率一致。鉴于我们的单脉冲搜索管道的最新改进，我们还重新审视了GBNCC调查对各种突发属性的敏感性。最后，我们没有发现FRB 20200125A星际散射的证据，增加了越来越多的证据表明，一些FRB有环爆环境，自由自由吸收和散射并不显着。
Discovery of a new Soft Gamma Repeater, SGR J1833-0832
在2010年3月19日，雨燕/爆发警报望远镜触发了一个短爆发，其时间和光谱特征类似于软伽马中继器（SGR）爆发。然而，源位置与任何已知的SGR都不一致。随后用斯威夫特/X射线望远镜和罗西X射线计时探测器（RXTE）对源误差盒进行了观测，发现了一个新的X射线源，其旋转周期为7.56秒，确认SGR J1833-0832是一颗新的磁星。基于我们详细的时间和频谱分析，我们表明新SGR正在快速自旋下降（4 x 10^{-12} s/s），并发现推断的偶极磁场为1.8 x 10^{14} G。我们还发现，SGR J1833-0832的X射线通量在爆发后大约20天内保持不变，然后开始下降。我们用钱德拉X射线天文台推导出了源的精确位置，并在SGR J1833-0832的深光学和红外观测中寻找对应物，并用韦斯特博克射电合成望远镜寻找射电脉冲发射。最后，我们比较的光谱和时间特性的来源，其他候选磁星。
Periodic Emission Frequency Modulation in a Hyperactive Fast Radio Burst
School of Astronomy and Space Science, Nanjing University（南京大学天文与空间科学学院）；Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University) Ministry of Education, China（中国教育部现代天体物理学与天文学重点实验室（南京大学））；Department of Astronomy, University of Science and Technology of China（中国科学技术大学天文系）
Discovery of 30 Repeating Fast Radio Burst Sources and Uniform Population Statistics of 80 Repeating Sources from CHIME/FRB
McGill University（麦吉尔大学）；University of Amsterdam（阿姆斯特丹大学）；California Institute of Technology（加州理工学院）；Netherlands Institute for Radio Astronomy（荷兰射电天文研究所）
Einstein Probe discovery of EP J171159.4-333253: an eclipsing neutron star low-mass X-ray binary with clocked bursts
National Astronomical Observatories, Chinese Academy of Sciences（中国科学院国家天文台）；Institute of Space Sciences (ICE, CSIC)（空间科学研究所（西班牙高等科学研究理事会））；Institut d’Estudis Espacials de Catalunya (IEEC)（加泰罗尼亚空间研究学院）；School of Astronomy and Space Science, University of Chinese Academy of Sciences（中国科学院大学天文与空间科学学院）；INAF–Osservatorio Astronomico di Brera（意大利国家天体物理研究所布雷拉天文台）
GECAM discovery of the second FRB-associated Magnetar X-ray Burst from SGR J1935+2154
State Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences（中国科学院高能物理研究所粒子天体物理国家重点实验室）；University of Chinese Academy of Sciences, Chinese Academy of Sciences（中国科学院大学）；Department of Astronomy, Tsinghua University（清华大学天文系）
