GRB970228和具有初始尖峰发射的伽玛暴类：它们遵循Amati关系吗？
GRB970228 and the class of GRBs with an initial spikelike emission: do they follow the Amati relation?
摘要：
在对GRB 050315和GRB 060218的最新认识的基础上，我们回到GRB 970228，第一个探测到余辉的伽马射线暴。我们提出它作为一类新的GRB的原型，“在最初的尖峰状发射之后，偶尔会出现持续十分之一秒的较软的扩展发射”。详细的理论计算的GRB 970228光变曲线在选定的能带的即时发射，并与观测BeppoSAX数据进行了比较。从我们的分析中，我们得出结论，GRB 970228和可能的上述新类别的伽玛暴是“典型的伽玛暴”只有一个特点：他们爆炸在银河系环境中，可能是晕，具有非常低的CBM密度值。在这里，我们调查GRB 970228揭示了这类伽玛暴的另一个特点：他们不满足“阿马蒂关系”。我们提供了一个理论上的解释内的Fireshell模型的明显缺乏这种相关性的伽玛暴属于这个新的类。
英文摘要：
On the basis of the recent understanding of GRB050315 and GRB060218, we return to GRB970228, the first Gamma-Ray Burst (GRB) with detected afterglow. We proposed it as the prototype for a new class of GRBs with "an occasional softer extended emission lasting tenths of seconds after an initial spikelike emission". Detailed theoretical computation of the GRB970228 light curves in selected energy bands for the prompt emission are presented and compared with observational BeppoSAX data. From our analysis we conclude that GRB970228 and likely the ones of the above mentioned new class of GRBs are "canonical GRBs" have only one peculiarity: they exploded in a galactic environment, possibly the halo, with a very low value of CBM density. Here we investigate how GRB970228 unveils another peculiarity of this class of GRBs: they do not fulfill the "Amati relation". We provide a theoretical explanation within the fireshell model for the apparent absence of such correlation for the GRBs belonging to this new class.
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