In this section we show an example of GRBM 240 channel spectrum derived for the very bright GRB980516. This burst ranks first in this GRBM catalog for both total fluence and peak flux. Because of its arrival direction with respect to the BeppoSAX local frame of reference, its counts could not have been converted into physical units at that epoch, since no GRBM response matrix was available yet for that direction. Here this burst is taken to show the spectral reconstruction capabilities of the new GRBM response matrix, when applied to some outstanding bursts from this catalog. Even if Ulysses and Konus/WIND detected this burst too (Hurley, priv. comm.), no IPN position was issued; thus, the direction has been carefully estimated by means of the localization technique described in chapter 2.
We have chosen this burst in particular, because it has not been studied yet, and, obviously, because it is the brightest one of the current GRBM catalog, with almost twice as fluence of the famous GRB990123, ranking second.