论文标题
Insight-HXMT专用33天的SGR J1935+2154 I.爆发目录
Insight-HXMT dedicated 33-day observation of SGR J1935+2154 I. Burst Catalog
论文作者
论文摘要
磁铁是具有极端磁场的中子星，有时表现为软伽马射线中继器（SGRS）。 SGR J1935+2154是最多产的毛毛之一，也是第一个确认的快速无线电爆发来源（即FRB 200428）。在发现FRB的第一个X射线对应物的鼓励下，Insight-Hard-Hard-Hard X射线调节望远镜（Insight-HXMT）实施了专用33天的长期观察到SGR J1935+2154自2020年4月28日以来，HE，ME和LE TELESCOPES。具有高时间分辨率和高灵敏度的非常广泛的能量范围（1-250 KEV），从而为SGR J1935+2154的详细研究提供了独特的宝贵数据集。在这项工作中，我们对该观察结果进行了全面分析，包括详细的爆发搜索，识别和时间分析。仔细删除虚假触发器后，我们发现SGR J1935+2154的总共75次突发，其中70个是单脉冲的。最大爆发速率约为56次/天。两次连续爆发之间的爆发持续时间和等待时间都遵循对数正常分布，这与先前的研究一致。我们还发现，持续时间更长的爆发（有些是多脉冲）往往会以相对较高的爆发速率发生。等待时间与前一个或后者爆发的持续时间或持续时间之间没有相关性。与以前的一些报告相反，似乎爆发持续时间和硬度比之间也没有相关性。此外，除了FRB 200428，我们没有发现与任何报道的无线电爆发相关的任何X射线爆发。
Magnetars are neutron stars with extreme magnetic field and sometimes manifest as soft gamma-ray repeaters (SGRs). SGR J1935+2154 is one of the most prolific bursters and the first confirmed source of fast radio burst (i.e. FRB 200428). Encouraged by the discovery of the first X-ray counterpart of FRB, Insight-Hard X-ray Modulation Telescope (Insight-HXMT) implemented a dedicated 33-day long ToO observation of SGR J1935+2154 since April 28, 2020. With the HE, ME, and LE telescopes, Insight-HXMT provides a thorough monitoring of burst activity evolution of SGR J1935+2154, in a very broad energy range (1-250 keV) with high temporal resolution and high sensitivity, resulting in a unique valuable data set for detailed studies of SGR J1935+2154. In this work, we conduct a comprehensive analysis of this observation including detailed burst search, identification and temporal analyses. After carefully removing false triggers, we find a total of 75 bursts from SGR J1935+2154, out of which 70 are single-pulsed. The maximum burst rate is about 56 bursts/day. Both the burst duration and the waiting time between two successive bursts follow log-normal distributions, consistent with previous studies. We also find that bursts with longer duration (some are multi-pulsed) tend to occur during the period with relatively high burst rate. There is no correlation between the waiting time and the fluence or duration of either the former or latter burst. It also seems that there is no correlation between burst duration and hardness ratio, in contrast to some previous reports. In addition, we do not find any X-ray burst associated with any reported radio bursts except for FRB 200428.
