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(shortened) We study the Gamma-Ray Burst (GRB) 060218: a particularly closesource at z=0.033 with an extremely long duration, namely T_{90} ~ 2000 s,related to SN 2006aj. [...] I present the fitting time consuming procedure. Inorder to show its sensitivity I also present two examples of fits with the samevalue of B and different value of E_{e^\pm}^{tot}. We fit the X- and \gamma-rayobservations by Swift of GRB 060218 in the 0.1-150 keV energy band during theentire time of observations from 0 all the way to 10^6 s within a unifiedtheoretical model. The free parameters of our theory are only three, namely thetotal energy E_{e\pm}^{tot} of the e^\pm plasma, its baryon loading B \equivM_Bc^2/E_{e\pm}^{tot}, as well as the CircumBurst Medium (CBM) distribution. Wejustify the extremely long duration of this GRB by a total energyE_{e\pm}^{tot} = 2.32\times 10^{50} erg, a very high value of the baryonloading B=1.0\times 10^{-2} and the effective CircumBurst Medium (CBM) densitywhich shows a radial dependence n_{cbm} \propto r^{-\alpha} with 1.0 \leq\alpha \leq 1.7 and monotonically decreases from 1 to $10^{-6}$particles/cm$^3$. We recall that this value of the $B$ parameter is the highestamong the sources we have analyzed and it is very close to its absolute upperlimit expected. [...] We also think that the smallest possible black hole,formed by the gravitational collapse of a neutron star in a binary system, isconsistent with the especially low energetics of the class of GRBs associatedwith SNe Ib/c.

GRB 060218 and the binaries as progenitors of GRB-SN systems