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It has been recently argued that low-luminosity gamma-ray bursts (LL-GRBs)are likely a unique GRB population. Here, we present systematic analysis of thelightcurve characteristics from X-ray to gamma-ray energy bands for the twoprototypical LL-GRBs 980425 and 060218. It is found that both the pulse width($w$) and the ratio of the rising width to the decaying width ($r/d$) of thesestwo bursts are energy-dependent over a broad energy band. There exists asignificant trend that the pulses tend to be narrower and more symmetry withrespect to the higher energy bands for the two events. Both the X-rays and thegamma-rays follow the same $w - E$ and $r/d - E$ relations. These facts mayindicate that the X-ray emission tracks the gamma-ray emission and both arelikely to be originated from the same physical mechanism. Their light curvesshow significant spectral lags. We calculate the three types of lags with thepulse peaking time ($t_{peak}$), the pulse centroid time ($t_{cen}$), and thecross-correlation function (CCF). The derived $t_{peak}$ and $t_{cen}$ are apower-law function of energy. The lag calculated by CCF is strongly correlatedwith that derived from $t_{peak}$. But the lag derived from $t_{cen}$ is lesscorrelated with that derived from $t_{peak}$ and CCF. The energy dependence ofthe lags is shallower at higher energy bands. These characteristics are wellconsistent with that observed in typical long-lag, wide-pulse GRBs, suggestingthat GRBs 980425 and 060218 may share the similar radiation physics with them.

Broadband lightcurve characteristics of GRBs 980425 and 060218 and comparison with long-lag, wide-pulse GRBs