论文标题
grb 220426a的费米观察：类似于GRB 090902b的爆发
Fermi Observations of GRB 220426A: a burst similar to GRB 090902B
论文作者
论文摘要
我们报告了一个非常明亮的，长时间的伽马射线爆发（GRB），GRB〜220426a，由\ emph {fermi}卫星观察到。 grb〜220426a，总持续时间为$ t_ {90} = 6 $ 〜s由两个主脉冲和一些子峰组成。带有带函数的这种爆发的光谱分析表明，时间集成和时间分辨的光谱都非常狭窄，高$α\ gtrsim 0.2 $ 0.2 $和低$β\ lyssim -3.1 $。它让人联想到Grb〜090902b，这是一种特殊的GRB，并鉴定出光电发射。然后，我们基于非截止光电发射的光谱分析进行频谱分析，可以将其很好地建模为具有热温的截止幂律分布的多色黑体。光谱配件表明，光球发射可以很好地描述这种爆发的辐射光谱。我们得出的结论是，这种爆发将是\ emph {fermi}卫星观察到的GRB〜090902b等级的第二次突发。我们还讨论了GRB〜220426a中光球的物理和高能组件的起源。
We report on a very bright, long-duration gamma-ray burst (GRB), GRB~220426A, observed by \emph{Fermi} satellite. GRB~220426A with total duration of $T_{90}=6$~s is composed with two main pulses and some sub-peaks. The spectral analysis of this burst with Band function reveals that both the time-integrated and the time-resolved spectra are very narrow with high $α\gtrsim 0.2$ and low $β\lesssim -3.1$. It is strong reminiscent of GRB~090902B, a special GRB with identification of the photospheric emission. Then, we perform the spectral analysis of this burst based on a non-dissipated photospheric emission, which can be well modelled as the multicolor-blackbody with a cutoff power-law distribution of the thermal temperature. The spectral fittings reveal that the photospheric emission can well describe the radiation spectrum of this burst. We conclude that this burst would be a second burst in the class of GRB~090902B observed by \emph{Fermi} satellite. We also discuss the physics of photosphere and the origin of the high-energy component in GRB~220426A .
