Piron, F.F.Pironvon Kienlin, A.A.von KienlinCutini, SaraSaraCutini2020-09-172020-09-172010-03-01https://hdl.handle.net/20.500.13025/1636SCIENCE WITH THE NEW GENERATION OF HIGH ENERGY GAMMA-RAY EXPERIMENTS Proceedings of the 7th Workshop on Gamma-Ray Physics in the LHC Era. AIP Conference Proceedings, Volume 1223, pp. 233-238 (2010).The Fermi observatory is advancing our knowledge of Gamma-Ray Bursts (GRBs) through pioneering observations at high energies, covering more then 7 decades of 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 long GRB 090217 which triggered the GBM and as been independently detected by the on-ground blind search LAT algorithm. We present the GBM and LAT observations, including a temporal profile and time-resolved spectral analysis from 8 keV up to ~1 GeV. The time-averaged and time-resolved spectra are well reproduced by a Band model, with no substantial spectral evolution. We compare these observations to the other LAT detections of long bursts, and discuss some theoretical implications on GRB high-energy emission.gamma-ray sources (astronomical)astronomical observatoriesastronomical telescopesX-ray spectrascintillators PACS Keywords gamma-ray sourcesgamma-ray burstsObservatories and site testingSpace-based ultraviolet optical and infrared telescopesX-ray sourcesX-ray burstsScintillation detectors10.1063/1.3395990http://adsabs.harvard.edu/abs/2010AIPC.1223..233C2010AIPC.1223..233C