A tool to estimate the Fermi Large Area Telescope background for short-duration observations |
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| Institution: | 1. Institute of Geophysics and Geomatics, China University of Geosciences (Wuhan), 388 Lumo Rd., Wuhan, Hubei 430074, China;2. Subsurface Imaging and Sensing Laboratory, Institute of Geophysics and Geomatics, China University of Geosciences, 388 Lumo Rd., Wuhan, Hubei 430074, China;3. Hubei Subsurface Multi-scale Imaging Key Laboratory, China University of Geosciences (Wuhan), 388 Lumo Rd., Wuhan, Hubei 430074, China |
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| Abstract: | The proper estimation of the background is a crucial component of data analyses in astrophysics, such as source detection, temporal studies, spectroscopy, and localization. For the case of the Large Area Telescope (LAT) on board the Fermi spacecraft, approaches to estimate the background for short (≲1000 s duration) observations fail if they ignore the strong dependence of the LAT background on the continuously changing observational conditions. We present a (to be) publicly available background-estimation tool created and used by the LAT Collaboration in several analyses of Gamma Ray Bursts. This tool can accurately estimate the expected LAT background for any observational conditions, including, for example, observations with rapid variations of the Fermi spacecraft’s orientation occurring during automatic repointings. |
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| Keywords: | Gamma Ray Bursts Space-born observatory Gamma ray astronomy Background estimation |
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