I consider the recent discovery of a soft X-ray source inside the error box of the gamma ray burst GB 960720 by the SAX, ASCA and ROSAT satellites, in terms of the fireball model. I show that the ejecta shell, which, after causing the burst is cold and dense, but still relativistic, keeps plowing through the interstellar medium, heating up the just-shocked matter which then emits X-rays. I compute the radiation emitted by this matter. I show that, up to about two months after the burst, in the cosmological scenario a soft X-ray (0.1-10 keV) flux of at least $\approx 10^{-13} erg s^{-1} cm^{-2}$, well within current observational capabilities, is generated, explaining the observations of the three satellites. Instead, in the Galactic Halo scenario a flux 3 orders of magnitude lower is expected. Detection of this non-thermal, declining flux in a statistically significant number of objects would simultaneously establish the fireball model and the cosmological nature of gamma ray bursts.
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机译:我认为,根据火球模型,最近SAX,ASCA和ROSAT卫星在伽马射线爆发GB 960720的误差框中发现了软X射线源。我发现,引起爆炸的弹射壳冷而致密,但仍然相对论,不断在星际介质上耕作,加热刚被电击的物质,然后发射出X射线。我计算出此物质发出的辐射。我证明,在爆炸发生后的大约两个月内,在宇宙学场景中,软X射线(0.1-10 keV)通量至少为$ \约10 ^ {-13} erg s ^ {-1} cm ^产生了{-2} $,完全在当前的观测能力之内,解释了三颗卫星的观测结果。取而代之的是,在银河晕场景中,预计通量会降低3个数量级。在统计上数量众多的物体中检测到这种非热的,下降的通量将同时建立火球模型和伽马射线爆发的宇宙学性质。
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