FERMI observations of high-energy gamma-ray emission from GRB 090217A
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.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE
- Contributing Organization:
- The Fermi LAT Collaboration
- Grant/Contract Number:
- AC02-76SF00515
- OSTI ID:
- 1357545
- Journal Information:
- The Astrophysical Journal. Letters, Vol. 717, Issue 2; ISSN 2041-8205
- Publisher:
- Institute of Physics (IOP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Bulk Lorentz factors of gamma-ray bursts
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journal | January 2018 |
“SELF-ABSORBED” GeV LIGHT CURVES OF GAMMA-RAY BURST AFTERGLOWS
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journal | May 2014 |
Bayesian Time-resolved Spectroscopy of GRB Pulses
|
journal | November 2019 |
"Self-absorbed" GeV light-curves of Gamma-Ray Burst afterglows | text | January 2013 |
Bulk Lorentz factors of Gamma-Ray Bursts | text | January 2017 |
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