Fermi Gamma-ray Space Telescope

Simulating GBM Data

Through its 'fakeit' command the xspec spectral analysis tool is capable of simulating model count spectra given a background spectrum and a response matrix. The simulated model can then be fit by xspec as though it were a real spectrum. The simulated count spectrum, plots and other products can be stored in standard file formats.

To use 'fakeit' you must first load in a background file in the standard PHA format and the response matrix in the standard RSP format. Background and response files are provided with every GBM burst. Instructions in the use of 'fakeit' can be found in the xspec manual.

This simulation capability was behind the 'Fermispec' (formerly GLASTspec) webtool.

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