AstroSat上LAXPC的绝对时间校准
Absolute Time Calibration of LAXPC aboard AstroSat
摘要：
AstroSat飞行任务携带了几个高能探测器，用于对宇宙源进行快速计时研究。为了进行高精度的多波长定时研究，必须校准这些仪器的绝对时间戳以达到最佳精度。我们在这里提出的绝对时间校准的AstroSat LAXPC仪器，利用宽带电磁辐射的螃蟹脉冲星交叉校准费米-LAT和地面射电天文台巨型米波射电望远镜（GMRT）和Ooty射电望远镜（ORT）。使用脉冲星定时的技术，我们确定了固定的定时偏移LAXPC相对于这些不同的仪器，并与另一个AstroSat仪器，CZTI的偏移进行比较。
英文摘要：
The AstroSat mission carries several high-energy detectors meant for fast timing studies of cosmic sources. In order to carry out high precision multi-wavelength timing studies, it is essential to calibrate the absolute time stamps of these instruments to the best possible accuracy. We present here the absolute time calibration of the AstroSat LAXPC instrument, utilising the broadband electromagnetic emission from the Crab Pulsar to cross calibrate against Fermi-LAT and ground based radio observatories Giant Metrewave Radio Telescope (GMRT) and the Ooty Radio Telescope (ORT). Using the techniques of pulsar timing, we determine the fixed timing offsets of LAXPC with respect to these different instruments and also compare the offsets with those of another AstroSat instrument, CZTI.
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