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- W3122019993 abstract "We compare the isotropic equivalent 15–2000 keV γ-ray energy, Eγ, emitted by a sample of 91 swift Gamma-Ray Bursts with known redshifts, with the isotropic equivalent fireball energy, Efb, as estimated within the fireball model framework from X-ray afterglow observations of these bursts. The uncertainty in Eγ, which spans the range of ∼1051 to ∼1053.5 erg, is ≈25% on average, due mainly to the extrapolation from the BAT detector band to the 15–2000 keV band. The uncertainty in Efb is approximately a factor of 2, due mainly to the X-ray measurements' scatter. We find Eγ and Efb to be tightly correlated. The average(std) of are −0.34(0.60), and the upper limit on the intrinsic spread of ηγ is approximately 0.5 ( is the fraction of energy carried by electrons and is inferred from the X-ray flux at x hours). and are similar, with an average(std) of of 0.04(0.28). The small variance of ηγ implies that burst-to-burst variations in and in the efficiency of fireball energy conversion to γ-rays are small, and suggests that both are of order unity. The small variance of ηγ and the similarity of and further imply that deviations from a simple fireball model description, if present, are small. This puts stringent constraints on models incorporating such modifications (due e.g., to radiative losses, energy injection, off-axis viewing)." @default.
- W3122019993 created "2021-02-01" @default.
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- W3122019993 date "2016-06-21" @default.
- W3122019993 modified "2023-10-15" @default.
- W3122019993 title "THE ENERGY BUDGET OF GRBs BASED ON A LARGE SAMPLE OF PROMPT AND AFTERGLOW OBSERVATIONS" @default.
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- W3122019993 doi "https://doi.org/10.3847/0004-637x/824/2/127" @default.
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