The effect of magnetic fields on gamma-ray bursts inferred from multi-wavelength observations of the burst of 23 January 1999

Galama, T.J. and Briggs, M.S. and Wijers, Ramj and Vreeswijk, P.M. and Rol, E. and Band, D. and van Paradijs, J. and Kouveliotou, C. and Preece, R.D. and Bremer, M. and Smith, I.A. and Tilanus, R.P.J. and de Bruyn, A.G. and Strom, R.G. and Pooley, G. and Castro-Tirado, A.J. and Tanvir, N. and Robinson, Colin and Hurley, K. and Heise, J. and Telting, J. and Rutten, R.G.M. and Packham, C. and Swaters, R. and Davies, J.K. and Fassia, A. and Green, Simon F. and Foster, Michael J. and Sagar, R. and Pandey, A.K. and Yadav, R.K.S. and Ofek, E.O. and Leibowitz, E. and Ibbetson, P. and Rhoads, J. and Falco, E. and Petry, C. and Impey, C. and Geballe, T.R. and Bhattacharya, D. (1999) The effect of magnetic fields on gamma-ray bursts inferred from multi-wavelength observations of the burst of 23 January 1999. Nature, 398 (6726). pp. 394-399. ISSN 0028-0836. (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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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 tbe short-lived radio emission. We suggest that the differences between bursts reflect variations In the magnetic-field strength in the afterglow-emitting regions.

Item Type: Article
Subjects: Q Science
Divisions: Faculties > Science Technology and Medical Studies > School of Physical Sciences
Depositing User: I.T. Ekpo
Date Deposited: 02 May 2009 18:26
Last Modified: 05 Jun 2014 10:13
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