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Title: The effect of magnetic fields on bold gamma-ray bursts inferred from multi-wavelength observations of the burst of 23 January 1999
Authors: Galama, T.J.
Briggs, M.S.
Wijers, R.A.M.J.
Bhattacharya, D.
et al.
Issue Date: 1-Apr-1999
Publisher: Nature Publishing Group
Citation: Nature, 1999, Vol.398, p394-399
Abstract: Gamma-ray bursts (GRBs) are thought to arise when an extremely relativistic outflow of particles from a massive explosion (the nature of which is still unclear) interacts with material surrounding the site of the explosion. Observations of the evolving changes in emission at many wavelengths allow us to investigate the origin of the photons, and so potentially determine the nature of the explosion. Here we report the results of gamma-ray, optical, infrared, submillimetre, millimetre and radio observations of the burst GRB990123 and its afterglow. Our interpretation of the data indicates that the initial and afterglow emissions are associated with three distinct regions in the fireball. The peak flux of the afterglow, one day after the burst, has a lower frequency than observed for other bursts; this explains the short-lived radio emission. We suggest that the differences between bursts reflect variations in the magnetic-field strength in the afterglow-emitting regions.
Description: Restricted Access.
ISSN: 0028-0836
1476-4687 (online)
Alternative Location:
Copyright: 1999 Nature Publishing Group
Appears in Collections:Research Papers (A&A)

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