The Fermi GBM gamma-ray burst time-resolved spectral catalog: Brightest bursts in the first four years

Yu, H.-F. and Preece, R. D. and Greiner, J. and Bhat, P. N. and Bissaldi, E. and Veres, Péter (2016) The Fermi GBM gamma-ray burst time-resolved spectral catalog: Brightest bursts in the first four years. ASTRONOMY & ASTROPHYSICS, 588. ISSN 0004-6361

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Abstract

Aims. We aim to obtain high-quality time-resolved spectral fits of gamma-ray bursts (GRBs) observed by the Gamma-ray Burst Monitor (GBM) on board the Fermi Gamma-ray Space Telescope. Methods. We perform time-resolved spectral analysis with high temporal and spectral resolution of the brightest bursts observed by Fermi GBM in its first 4 years of mission. Results. We present the complete catalog containing 1,491 spectra from 81 bursts with high spectral and temporal resolution. Distri- butions of parameters, statistics of the parameter populations, parameter-parameter and parameter-uncertainty correlations, and their exact values are obtained and presented as main results in this catalog. We report a criterion that is robust enough to automatically dis- tinguish between different spectral evolutionary trends between bursts. We also search for plausible blackbody emission components and find that only 3 bursts (36 spectra in total) show evidence of a pure Planck function. It is observed that the averaged time-resolved low-energy power-law index and peak energy are slightly harder than the time-integrated values. Time-resolved spectroscopic results should be used when interpreting physics from the observed spectra, instead of the time-integrated results.

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