Very high energy follow-up observations of gamma-ray bursts detected by Fermi and Swift
Abstract
In many theoretical models of gamma-ray bursts (GRBs) and their afterglows, the emission of photons above 100 GeV is predicted. The Large Area Telescope (LAT) on-board the Fermi Gamma-ray Space Telescope has detected delayed, high-energy emission (up to 90 GeV in the burst rest-frame) from several GRBs and no evidence of a high-energy spectral cutoff during the early afterglow phase of the burst has been found. Presented here are the results of follow-up observations with VERITAS, a ground-based telescope array sensitive to gamma-rays above 100 GeV, of GRBs detected by the Fermi and Swift satellites. These observations have not yielded a conclusive detection and the upper limits on very high energy (VHE, E>100 GeV) gamma-ray flux obtained from these observations are among the most constraining to date.
- Publication:
-
International Cosmic Ray Conference
- Pub Date:
- 2011
- DOI:
- 10.7529/ICRC2011/V08/0945
- arXiv:
- arXiv:1111.1326
- Bibcode:
- 2011ICRC....8..223A
- Keywords:
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- Astrophysics - High Energy Astrophysical Phenomena
- E-Print:
- 4 pages, 2 figures, Proceeding of the 32nd International Cosmic Ray Conference (Beijing 2011)