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Short GRBs with extended emission (EE) that are composed initially of ashort-hard spike and followed by a long-lasting EE, are thought to beclassified as a subsection of short GRBs. The narrow energy band availableduring the {\em Swift} era combined with a lack of spectral informationprevented discovery of the intrinsic properties of those events. In this paper,we performed a systematic search of short GRBs with EE by using all available{\em Fermi}/GBM data. The search identified 26 GBM-detected short GRBs with EEthat are similar to GRB 060614 observed by {\em Swift}/BAT. We focus oninvestigating the spectral and temporal properties for both the hard spike andthe EE components of all 26 GRBs, and explore differences and possiblecorrelations between them. We find that while the peak energy ($E_{\rm p}$) ofthe hard spikes is a little bit harder than that of the EE, but their fluencesare comparable. The harder $E_{\rm p}$ seems to correspond to a larger fluenceand peak flux with a large scatter for both the hard spike and EE components.Moreover, the $E_{\rm p}$ of both the hard spikes and EE are compared to othershort GRBs. Finally, we also compare the properties of GRB 170817A with thoseshort GRBs with EE and find no significant statistical differences betweenthem. We find that GRB 170817A has the lowest $E_{\rm p}$, likely because itwas off-axis.

The properties of prompt emission in short GRBs with extended emission observed by {\em Fermi}/GBM