在GRB 021206的光谱中观察到非预期硬化
Observation of an unexpected hardening in the spectrum of GRB 021206
摘要：
GRB 021206是迄今为止观测到的最亮的GRB之一。它的即时发射，由RHESSI测量，显示出意想不到的光谱特征。该光谱具有约700 keV的峰值能量，并且可以通过高达4.5 MeV的带函数来描述。在4.5 MeV以上，谱再次变硬，因此能带函数无法拟合到17 MeV的整个RHESSI能量范围。黑体函数加上幂律的和也不能，即使这样的函数可以描述光谱硬化。另一方面，炮弹模型预测了这种硬化，我们发现它完全符合GRB 021206的光谱。我们还分析了RHESSI观测到的其他强伽玛暴，即伽玛暴020715，021008，030329，030406，030519B，031027，031111。我们发现，它们的光谱都可以用炮弹模型和带函数来拟合。
英文摘要：
GRB 021206 is one of the brightest GRBs ever observed. Its prompt emission, as measured by RHESSI, shows an unexpected spectral feature. The spectrum has a peak energy of about 700 keV and can be described by a Band function up to 4.5 MeV. Above 4.5 MeV, the spectrum hardens again, so that the Band function fails to fit the whole RHESSI energy range up to 17 MeV. Nor does the sum of a blackbody function plus a power law, even though such a function can describe a spectral hardening. The cannonball model on the other hand predicts such a hardening, and we found that it fits the spectrum of GRB 021206 perfectly. We also analysed other strong GRBs observed by RHESSI, namely GRBs 020715, 021008, 030329, 030406, 030519B, 031027, 031111. We found that all their spectra can be fit by the cannonball model as well as by a Band function.
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