期刊
ASTROPHYSICAL JOURNAL
卷 540, 期 2, 页码 697-703出版社
IOP PUBLISHING LTD
DOI: 10.1086/309369
关键词
gamma rays : bursts; gamma rays : observations; shock waves; X-rays : general
We discuss observations of the prompt X- and gamma-ray emission and X-ray afterglow from GRB 981226. This event has the weakest gamma-ray peak flux detected with the BeppoSAX Gamma-Ray Burst Monitor. It shows an isolated X-ray precursor and the highest X-ray to gamma-ray fluence ratio measured thus far with the BeppoSAX Wide Field Cameras. The event was followed up with the BeppoSAX Narrow Field Instruments, and the X-ray afterglow was detected up to 10 keV. The afterglow flux is observed to rise from a level below the sensitivity of the MECS/LECS telescopes up to a peak flux of (5 +/- 1) x 10(-13) ergs cm(-2) s(-1) in the 2-10 keV energy band. This rise is followed by a decline according to a power law with an index of 1.31(-0.39)(+0.44). We discuss these results in the light of the current GRB models.
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