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GRB 990510: ON THE POSSIBILITY OF A BEAMED X-RAY AFTERGLOW

机译:GRB 990510:关于X射线束照射后的可能性

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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 x 10~(-5) ergs cm~(-2), whereas it reached a peak flux of ~2.4 x 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.
机译:我们使用BeppoSAX上的伽玛射线爆裂监测仪和窄场仪器进行观测,讨论了γ射线爆裂GRB 990510的迅速发射及其在迅速发射后8.0到44.3小时的后续X射线余辉。在40-700 keV波段,GRB 990510的通量约为1.9 x 10〜(-5)ergs cm〜(-2),而峰值通量则约为〜2.4 x 10〜(-6)ergs cm〜。 (-2)秒〜(-1)。 X射线余辉衰减光曲线可以通过单一幂定律令人满意地描述,其折射率为-1.42±0.07。余辉的X射线和光学行为都可以通过γ射线破裂的碎片作为射流扩展来解释。我们发现冷却频率固定在光学和X射线波段之间。

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