论文标题
GRB 200415a：磁性巨人耀斑还是短伽玛射线爆发？
GRB 200415A: magnetar giant flare or short gamma-ray burst?
论文作者
论文摘要
对GBM/FERMI实验数据进行了详细分析，以对GRB 200415a进行分类。结果表明，一方面，此事件显示出I型（短）伽马射线爆发（GRB）特性的典型特性，例如持续时间，可变性和光谱演化的特征（滞后）。另一方面，事件源在天体平面上的定位，通过三角测量方法（IPN）获得，指示附近的（$ d_l $ = 3.5 mpc）Galaxy NGC 253（雕刻员）作为此爆发的可能的宿主星系。它引入了对事件的能量学的重大限制（$ e_ {iso} $ \ sim $ $ $ 10^{46} $ erg），并提供了GRB 200415a作为软gamma repeater（sgr）的巨型耀斑（GF）的替代解释。这种解释得到了非典型硬能谱的支持。此外，根据$ e_ {p，i} $ - $ e_ {iso} $的爆发位置（在能量频谱$νf_ν$中最大位置在源框架中的位置，具体取决于总能量的总能量，取决于总能量的总能量，在伽玛射线中发出的总和$ t_ {$ t_ $ -e { $ eh = e_ {组成一个定义明确的组，其中包括GRB 200415a。
A detailed analysis of the GBM/Fermi experiment data is carried out to classify GRB 200415A. It is shown that, on the one hand, this event exhibits typical for type I (short) gamma-ray bursts (GRBs) properties, such as duration, variability, and the character of spectral evolution (lag). On the other hand, the localization of the event source on the celestial plane, obtained by the triangulation method (IPN), indicates the nearby ($ D_L $ = 3.5 Mpc) galaxy NGC 253 (Sculptor) as a possible host galaxy for this burst. It introduces significant restrictions on the energetics of the event ($ E_{iso} $ $ \sim $ $ 10^{46} $ erg) and gives an alternative interpretation of GRB 200415A as a giant flare (GF) of a soft gamma repeater (SGR). This interpretation is supported by the atypically hard energy spectrum. In addition, according to the position of the burst on the $ E_{p, i} $ -- $ E_{iso} $ (the position of the maximum in the energy spectrum $ νF_ν $ in the source frame depending on the isotropic equivalent of the total energy, emitted in gamma rays) and $ T_{90, i} $ -- $ EH $ (duration in the source frame depending on the combination of parameters $ EH = E_{p,i,2} ~ E_{iso,51}^{ ~ -0.4} $) diagrams, GRB 200415A is unambiguously classified as a giant flare of a magnetar, assuming its association with the galaxy NGC 253. In these diagrams, known giant flares in the Galaxy and candidates for giant flares in nearby galaxies form a well-defined group, which includes the GRB 200415A.
