主要内容:
说短暴也满足E_peak--Flux的统计关系
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- · arXiv e-print (arXiv:1008.4767)
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| Title: |
| Spectral evolution of Fermi/GBM short Gamma-Ray Bursts |
| Authors: |
| Ghirlanda, G.; Ghisellini, G.; Nava, L.; Burlon, D. |
| Publication: |
| eprint arXiv:1008.4767 |
| Publication Date: |
| 08/2010 |
| Origin: |
| ARXIV |
| Keywords: |
| Astrophysics - High Energy Astrophysical Phenomena |
| Comment: |
| 5 pages, 1 table, 3 figures. Submitted to MNRAS |
| Bibliographic Code: |
| 2010arXiv1008.4767G |
Abstract
We study the spectral evolution of 14 short duration Gamma Ray Bursts (GRBs) detected by the Gamma Burst Monitor (GBM) on board Fermi. We study spectra resolved in time at the level of 4-64 ms in the 8 keV-35 MeV energy range. We find a strong correlation between the observed peak energy Ep and the flux P within individual short GRBs. The slope of the Ep~P^s correlation for individual bursts ranges between ~0.4 and ~1. The rise and decay phase of individual bursts follow the same Ep-P correlation. The same correlation holds also for the precursors present in two GRBs. There is no correlation between the low energy spectral index and the peak energy or the flux. Our results show that in our 14 short GRBs Ep evolves in time tracking the flux. This behavior is similar to what found in the population of long GRBs and it is in agreement with the evidence that long GRBs and (the still few) short GRBs with measured redshifts follow the same rest frame Ep-L correlation. Its origin is most likely to be found in the radiative mechanism that has to be the same in both classes of GRBs.
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