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Anomalies in low-energy gamma-ray burst spectra with theFermiGamma-ray Burst Monitor
Astronomy and Astrophysics
A Band function has become the standard spectral function used to describe the prompt emission spectra of gamma-ray bursts (GRBs). However, deviations from this function have previously been observed in GRBs detected by BATSE and in individual GRBs from the Fermi era. We present a systematic and rigorous search for spectral deviations from a Band function at low energies in a sample of the first two years of high fluence, long bursts detected by the Fermi Gamma-Ray Burst Monitor (GBM). Thedoi:10.1051/0004-6361/201220710 fatcat:fjyogdy4zncq5elphz7jwh3bvy