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GRB 021206 is one of the brightest GRBs ever observed. Its prompt emission,as measured by RHESSI, shows an unexpected spectral feature. The spectrum has apeak energy of about 700 keV and can be described by a Band function up to 4.5MeV. Above 4.5 MeV, the spectrum hardens again, so that the Band function failsto fit the whole RHESSI energy range up to 17 MeV. Nor does the sum of ablackbody function plus a power law, even though such a function can describe aspectral hardening. The cannonball model on the other hand predicts such ahardening, and we found that it fits the spectrum of GRB 021206 perfectly. Wealso analysed other strong GRBs observed by RHESSI, namely GRBs 020715, 021008,030329, 030406, 030519B, 031027, 031111. We found that all their spectra can befit by the cannonball model as well as by a Band function.

Observation of an unexpected hardening in the spectrum of GRB 021206