The Prompt X-Ray Emission of Gamma-Ray Burst 980519

Details The Prompt X-Ray Emission of Gamma-Ray Burst 980519 The Prompt X-Ray Emission of Gamma-Ray Burst 980519

May 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...516l..57i&link_type=abstract

The Astrophysical Journal, Volume 516, Issue 2, pp. L57-L60.

Astronomy and Astrophysics

Astronomy

24

Gamma-Rays: Bursts, X-Rays: General

Scientific paper

The prompt X-ray emission from gamma-ray burst (GRB) 980519, as measured with the Wide Field Cameras on board BeppoSAX, is characterized by a strong soft-to-hard-to-soft evolution. An analysis of the evolution of the X-ray spectrum in terms of a single power-law model shows that the photon index evolved from -2.0 to -1.1 to -2.4. The onset of the burst has such a soft spectrum that the 2-27 keV emission appears to precede the >~107 keV emission of GRB 980519 (as measured with the Burst and Transient Source Experiment) by about 70 s. Nevertheless, we show that this early spectral variation is part of a smooth evolution over the whole burst and that there is no convincing evidence that the early X-rays originate from a physical process that is different from that giving rise to the remainder of the burst.

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