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We argue a new classification scheme of long gamma-ray bursts (LGRBs) usingthe morphology of the cumulative light curve of the prompt emission. Weparametrize the morphology by the absolute deviation from their constantluminosity ($ADCL$) and derive the value for 36 LGRBs which have spectropicredshifts, spectral parameters determined by the Band model, 1-second peakfluxes, fluences, and 64-msec resolution light curves whose peak counts are 10times larger than background fluctuations. Then we devide the sample accordingto the value of ADCL into two groups ($ADCL < 0.17$ and $ADCL > 0.17$) and, foreach group, derive the spectral peak energy $E_{\rm p}$ - peak luminosity$L_{\rm p}$ correlation and the Fundamental Plane of LGRBs, which is acorrelation between the spectral peak energy $E_{\rm p}$, the luminosity time$T_{\rm L}$ ($\equiv E_{\rm iso}/L_{\rm p}$ where $E_{\rm iso}$ is isotropicenergy) and the peak luminosity $L_{\rm p}$. We find that both of thecorrelations for both groups are statistically more significant compared withones derived from all samples. The Fundamental Planes with small and large ADCLare given by $L_{\rm p}=10^{52.53\pm 0.01}(E_{\rm p}/10^{2.71}{\rmkeV})^{1.84\pm 0.03} (T_{\rm L}/10^{0.86}{\rm sec})^{0.29\pm0.08}$ with$\chi^2_{\nu}=10.93/14$ and $L_{\rm p}=10^{52.98\pm0.08}(E_{\rmp}/10^{2.71}{\rm keV})^{1.82\pm 0.09} (T_{\rm L}/10^{0.86}{\rm sec})^{0.85\pm0.27}$ with $\chi^2_{\nu}=7.58/8$, respectively. This fact implies theexistence of subclasses of LGRBs characterized by the value of $ADCL$. Alsothere is a hint for the existence of the intermediate-$ADCL$ class whichdeviates from both fundamental planes. Both relations are so tight that ourresult provides a new accurate distance measurement scheme up to the highredshift universe.

Identifying Subclasses of Long Gamma-Ray Bursts with Cumulative Light Curve Morphology of Prompt Emissions