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20 April 2024

» arxiv » astro-ph/0003258

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GRB990510: on the possibility of a beamed X-ray afterglow
E. Kuulkers ; L.A. Antonelli ; L. Kuiper ; J.S. Kaastra ; L. Amati ; E. Costa ; F. Frontera ; J. Heise ; J.J.M. in ’t Zand ; N. Masetti ; L. Nicastro ; E. Pian ; L. Piro ; P. Soffita ;
Date:	17 Mar 2000
Subject:	astro-ph
Abstract:	We discuss the prompt emission of the gamma-ray burst (GRB) 990510 and its subsequent X-ray afterglow from 8.0 to 44.3 hrs after the prompt emission, using observations with the Gamma-ray Burst Monitor and Narrow Field Instruments on BeppoSAX. In the 40-700 keV band, GRB990510 had a fluence of ~1.9x10^{-5}erg cm^{-2}, whereas it reached a peak flux of ~2.4x10^{-6}erg cm^{-2} s^{-1}. The X-ray afterglow decay light curve can be satisfactorily described by a single power law with index of -1.42+/-0.07. Both the X-ray and optical behaviour of the afterglow can be explained by gamma-ray burst debris expanding as a jet; we find that the cooling frequency is (fixed) between the optical and X-ray wavelength bands.
Source:	arXiv, astro-ph/0003258
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