Abstract
We discuss the prompt emission of the γ-ray burst GRB 990510 and its subsequent X-ray afterglow from 8.0 to 44.3 hr after the prompt emission, using observations with the Gamma-Ray Burst Monitor and Narrow Field Instruments on BeppoSAX. In the 40-700 keV band, GRB 990510 had a fluence of ~1.9 × 10-5 ergs cm-2, whereas it reached a peak flux of ~2.4 × 10-6 ergs cm-2 s-1. The X-ray afterglow decay light curve can be satisfactorily described by a single power law with an index of -1.42 ± 0.07. Both the X-ray and optical behavior of the afterglow can be explained by γ-ray burst debris expanding as a jet; we find that the cooling frequency is (fixed) between the optical and X-ray wavelength bands.
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