Ryde, F. and Battelino, M. (2005) The conspicuous gamma-ray burst of 30 May 1996. Il nuovo cimento C, 28 (3). pp. 335-338. ISSN 1826-9885
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Abstract
The spectra of the majority of bursts exhibit a low-energy power law index, α, that is either a constant or becomes softer with time. However, in the burst of 30 May 1996 α becomes harder. Here we show that this behavior can be explained by a hybrid model consisting of a thermal and a non-thermal component. In this burst the power law index of the non-thermal component changes drastically from s ∼ −1.5 to s ∼ −0.67 at approximately 5 seconds after the trigger, thereby revealing, at low energies, the thermal component with its hard Rayleigh-Jeans tail. This leads to the large α-values that are found if the Band function is fitted to the spectra. We suggest that the change in s could be due to a transition from fast to slow cooling of the electrons emitting in the BATSE range. This could be due to the fact that the magnetic field strength becomes weaker.
| Item Type: | Article |
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| Additional Information: | Paper presented at the “4th Workshop on Gamma-Ray Burst in the Afterglow Era”, Rome, October 18-22, 2004. |
| Uncontrolled Keywords: | γ-ray sources; γ-ray bursts |
| Subjects: | 500 Scienze naturali e Matematica > 530 Fisica |
| Depositing User: | Marina Spanti |
| Date Deposited: | 16 Mar 2020 10:08 |
| Last Modified: | 16 Mar 2020 10:08 |
| URI: | http://eprints.bice.rm.cnr.it/id/eprint/15631 |
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