GRB 920229: Evidence for a sharp spectral break?

Details GRB 920229: Evidence for a sharp spectral break? GRB 920229: Evidence for a sharp spectral break?

Sep 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aipc..526..165b&link_type=abstract

GAMMA-RAY BURSTS: 5th Huntsville Symposium. AIP Conference Proceedings, Volume 526, pp. 165-169 (2000).

Physics

Gamma-Ray Sources, Gamma-Ray Bursts, Cosmic Rays, Distances, Redshifts, Radial Velocities, Spatial Distribution Of Galaxies

Scientific paper

It has been reported that observations made with BATSE of GRB 920229 show the continuum spectrum to be best-fit with a broken power law and that this fit demonstrates a sharp cutoff above 200 keV. The sharpness of this reported cutoff, ΔE/E=18%, is difficult to explain within the current paradigm for GRBs. We report our analysis of the continuum spectrum of GRB 920229. While a broken power law provides an excellent fit to the data, we find that the now standard Band GRB function provides an equally good fit. Furthermore, a broken power-law fit gives a moderate change in slope at the break rather than the reported dramatic change. Our analysis shows that the spectrum has a gradual cutoff typical of No-High Energy (NHE) events. .

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