标题： 一个长伽马射线暴中的周期增加振荡信号 显示英文标题

标题： A period-increasing oscillation signal in a long gamma-ray burst

摘要： 伽马射线暴（GRBs），宇宙中最明亮的电磁爆发，被认为起源于由快速旋转的中心引擎发射的超相对论性喷流，这个中心引擎可能是一个被吸积盘包围的新形成的黑洞（BH）或磁星。 这样的中心引擎可能具有迅速变化的物理特性，因为它刚刚形成。 引力波信号中时间增加频率的捕捉是对此观点的证据。 在这里，我们报告在GRB 131122B中发现的一个可能的振荡信号，在16.75秒的时间间隔内，周期从1.27秒增加到4.02秒。 这种特殊的振荡信号以前在GRBs中未被识别过，其周期性演化也可能是天体物理学电磁辐射窗口中发现的最快的一个。 由中等质量黑洞对恒星的潮汐撕裂引起的倾斜吸积盘的进动可能是该信号的原因。 这一发现可能会打开一个新窗口，以揭示GRBs隐藏中心引擎的性质。 显示英文摘要

摘要： Gamma-ray bursts (GRBs), the brightest electromagnetic bursts in the universe, are believed to originate from ultra-relativistic jets launched by the rapidly rotating central engine, either a disk-surrounded newly formed black hole (BH) or a magnetar. Such a central engine potentially possesses rapidly evolving physical characteristics, as it is just born. The caught of time-increasing frequency in the gravitational wave signals is the evidence of upon opinion. Here we report a possible oscillatory signal identified in GRB 131122B with periods increasing from 1.27 seconds to 4.02 seconds in a time interval of 16.75 seconds. Such a peculiar oscillation signal has not been identified in GRBs before and its periodic evolution could also be the quickest one found in the electromagnetic radiation window of astrophysics. The precession of a misaligned accretion disk caused by the tidal disruption of a star by an intermediate-mass BH may be responsible for this signal. This finding could open a new window to reveal the nature of the hiding central engine of GRBs.