Ackermann 2010 Fermi对GRB 090217A的观测

主要内容:
给出了GRB 090217A的观测，不想其他一般的高能暴，高能部分并没有时间上的延迟。

精彩摘抄:

光变

谱

谱指数

谱指数


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Title:		Fermi Observations of High-energy Gamma-ray Emission from GRB 090217A
Authors:		Ackermann, M.; Ajello, M.; Baldini, L.; et al.
Affiliation:		too many
Publication:		The Astrophysical Journal Letters, Volume 717, Issue 2, pp. L127-L132 (2010). (ApJL Homepage)
Publication Date:		07/2010
Origin:		IOP
ApJ Keywords:		gamma-ray burst: individual: GRB090217A
DOI:		10.1088/2041-8205/717/2/L127
Bibliographic Code:		2010ApJ...717L.127A

Abstract

The Fermi observatory is advancing our knowledge of gamma-ray bursts (GRBs) through pioneering observations at high energies, covering more than seven decades in energy with the two on-board detectors, the Large Area Telescope (LAT) and the Gamma-ray Burst Monitor (GBM). Here, we report on the observation of the long GRB 090217A which triggered the GBM and has been detected by the LAT with a significance greater than 9σ. We present the GBM and LAT observations and on-ground analyses, including the time-resolved spectra and the study of the temporal profile from 8 keV up to ~1 GeV. All spectra are well reproduced by a Band model. We compare these observations to the first two LAT-detected, long bursts GRB 080825C and GRB 080916C. These bursts were found to have time-dependent spectra and exhibited a delayed onset of the high-energy emission, which are not observed in the case of GRB 090217A. We discuss some theoretical implications for the high-energy emission of GRBs.

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