Abstract
Even modern large area detectors for gamma‐ray spectroscopy often do not provide sensitivity, sufficient for high time resolution spectroscopy of variable and transient astrophysical phenomena—especially those involving beaming, instabilities and relativistic motion. We propose a general method for analysis of time resolved gamma‐ray spectra of astrophysical transients—the Global Fit Analysis (GFA), which allows one to increase time resolution by an order of magnitude using certain non‐parametric assumptions about spectral variability of the source.Instead of parameterising individual spectra and analyzing spectral evolution of a transient in terms of numerous individual spectral fit parameters we define a spectral evolution model with a set of constant global parameters and just a few (N = 1–2) time dependent variables. This approach allows to determine dimension (N) of the evolution and global parameters for statistical studies of the source population.Originally, a particular kind of a global fit analy...
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