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arXiv 0710.0598astro-ph
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在INTEGRAL天文台的IBIS和SPI望远镜视场中探测到的宇宙伽马射线暴060428 C及其早期余辉

Cosmic gamma-ray burst 060428C detected in the fields of view of the IBIS and SPI telescopes of the INTEGRAL observatory and its early afterglow

S. A. Grebenev, I. V. Chelovekov

摘要:

通过分析INTEGRAL天文台的档案数据,我们发现并定位了2006年4月28日在IBIS/ISGRI和SPI望远镜视场内探测到的宇宙伽马射线暴。综合爆炸警报系统(IBAS)还没有发现爆炸,因此关于其坐标的信息没有及时分发,也没有进行余辉的搜索。KONUS/WIND和RHESSI航天器也探测到了这种爆发。在20-200 keV能量范围内,其通量为2.3 × 10 ^{-6} erg/cm^2,最大通量为3.6 × 10 ^{-7} erg/cm^2/s(3.9 phot/cm^2/s)。该爆发具有复杂的多峰轮廓,其光谱硬度随时间增加,是典型爆发的突出特征。在通量最大值附近的发射光谱的特征在于光子指数α ~ -1.5和峰值能量Ep ~ 95 keV。爆发持续约12秒,然后我们观察到它的余辉在能量15-45 keV根据指数约-4.5的幂律衰减。在余辉过程中,光谱硬度大幅下降。

英文摘要:

Analyzing archival data of the INTEGRAL observatory we discovered and localized a cosmic gamma-ray burst detected within fields of view of the IBIS/ISGRI and SPI telescopes on April 28, 2006. The burst has not been revealed by the INTEGRAL Burst Alert System (IBAS), so the information on its coordinates has not been distributed in time and search for the afterglow has not been carried out. The burst has been also detected by the KONUS/WIND and RHESSI spacecrafts. Its fluence was 2.3x10^{-6} erg/cm^2 in the 20-200 keV energy band, the maximum flux was 3.6x10^{-7} erg/cm^2/s (3.9 phot/cm^2/s). The burst had a complicated multi-peak profile and was outstanding of the typical bursts by increasing its spectral hardness with time. The emission spectrum near the flux maximum was characterized by the photon index alpha ~ -1.5 and the peak energy Ep ~ 95 keV. The burst lasted ~12 s, then we observed its afterglow at energies 15-45 keV decaying according to a power law with the index ~ -4.5. The spectral hardness decreased substantially during the afterglow.

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