Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2010-07-20
The Astrophysical Journal Letters, Volume 717, Issue 2, pp. L127-L132 (2010)
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
17 pages, 4 figures. Contact Authors: Fred, Piron; Sara, Cutini; Andreas, von Kienlin
Scientific paper
10.1088/2041-8205/717/2/L127
The Fermi observatory is advancing our knowledge of Gamma-Ray Bursts (GRBs) through pioneering observations at high energies, covering more than 7 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 9 sigma. 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.
Fermi-GBM Collaborations
Fermi-LAT
No associations
LandOfFree
Fermi observations of high-energy gamma-ray emission from GRB 090217A does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Fermi observations of high-energy gamma-ray emission from GRB 090217A, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fermi observations of high-energy gamma-ray emission from GRB 090217A will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-125902