Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998tx19.confe..63d&link_type=abstract
Abstracts of the 19th Texas Symposium on Relativistic Astrophysics and Cosmology, held in Paris, France, Dec. 14-18, 1998. Eds.:
Astronomy and Astrophysics
Astrophysics
2
Scientific paper
While only the highest fluence bursts (as determined by BATSE) have been observed by EGRET, the EGRET upper limits above 30 MeV for other bursts are consistent with extrapolations of the spectra measured above 1 MeV by Comptel. The average spectrum for bursts detected above 30 MeV indicates no cut off up to 10 GeV. Individual burst spectra in the range of 1-10 MeV have also been measured by EGRET and no high energy cut offs are observed and in several cases the spectrum is harder than E^{-2}. A high energy afterglow was observed in the highest fluence burst in EGRET's field of view, GRB940217, and with marginal significance in 6 other bright bursts.
Catelli Jennifer R.
Dingus Brenda Lynn
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