  GRB 031203 and GRB 980425 are the two outliers with respect to the Ep-Eiso
correlation of long GRBs. Recently Swift discovered a nearby extremely long GRB
060218 associated with a SN event. The spectral properties of this bursts are
striking: on the one hand its broad band SED presents both thermal and
non-thermal components which can be interpreted as due to the emission from the
hot cocoon surrounding the GRB jet and as standard synchrotron self absorbed
emission in the GRB prompt phase, respectively; on the other hand it is its
long duration and its hard--to--soft spectral evolution which make this
underluminous burst consistent with the Ep-Eiso correlation of long GRBs. By
comparing the available spectral informations on the two major outliers we
suggests that they might be twins of 060218 and, therefore, only apparent
outliers with respect to the Ep_Eiso correlation. This interpretation also
suggests that it is of primary importance the study the broad band spectra of
GRBs in order to monitor their spectral evolution throughout their complete
duration.
