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arXiv 0904.2226astro-ph.IMastro-ph.HE
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费米大面阵望远镜的在轨定标

The On-orbit Calibrations for the Fermi Large Area Telescope

The Fermi LAT Collaboration

摘要:

费米伽马射线太空望远镜上的大面积望远镜(LAT)于2008年6月23日开始了它的在轨操作。校准,在一般意义上定义,对应于触发信号的同步,锁存数据的延迟的优化,检测器阈值,增益和响应的确定,南大西洋异常(SAA)的周边评价,实时测量,绝对时间,以及内部和航天器的bodimeter对齐。在这里,我们描述了使用已知的天体物理源,银河宇宙射线,并注入到每个探测器的前端电子电荷获得的轨道校准结果。仪器响应功能将在单独的出版物中描述。本文证明了校准的稳定性,并描述了自发布以来观察到的微小变化。这些结果已被用于校准LAT数据集将于2009年8月公开发布。

英文摘要:

The Large Area Telescope (LAT) on--board the Fermi Gamma ray Space Telescope began its on--orbit operations on June 23, 2008. Calibrations, defined in a generic sense, correspond to synchronization of trigger signals, optimization of delays for latching data, determination of detector thresholds, gains and responses, evaluation of the perimeter of the South Atlantic Anomaly (SAA), measurements of live time, of absolute time, and internal and spacecraft boresight alignments. Here we describe on orbit calibration results obtained using known astrophysical sources, galactic cosmic rays, and charge injection into the front-end electronics of each detector. Instrument response functions will be described in a separate publication. This paper demonstrates the stability of calibrations and describes minor changes observed since launch. These results have been used to calibrate the LAT datasets to be publicly released in August 2009.

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