Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc..984..272c&link_type=abstract
HIGH TIME RESOLUTION ASTROPHYSICS: The Universe at Sub-Second Timescales. AIP Conference Proceedings, Volume 984, pp. 272-277 (
Astronomy and Astrophysics
Astrophysics
Spectroscopy And Spectrophotometry, Gamma-Ray, Time Series Analysis, Time Variability, Gamma-Ray Sources, Gamma-Ray Bursts
Scientific paper
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 analysis was successfully used for revealing spectral components in cosmic gamma-ray bursts [1]. In this paper we investigate, using GFA, spectral variability of GRBs with sub-millisecond time resolution.
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