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A thermal component is suggested to be the physical composition of the ejectaof several bright gamma-ray bursts (GRBs). Such a thermal component isdiscovered in the time-integrated spectra of several short GRBs as well as longGRBs. In this work, we present a comprehensive analysis of ten very short GRBsdetected by Fermi Gamma-Ray Burst Monitor to search for the thermal component.We found that both the resultant low-energy spectral index and the peak energyin each GRB imply a common hard spectral feature, which is in favor of the mainclassification of the short/hard versus long/soft dichotomy in the GRBduration. We also found moderate evidence for the detection of thermalcomponent in eight GRBs. Although such a thermal component contributes a smallproportion of the global prompt gamma-ray emission, the modifiedthermal-radiation mechanism could enhance the proportion significantly, such asin subphotospheric dissipation.

A Comprehensive Study of Bright Fermi-GBM Short Gamma-Ray Bursts: II. Very Short Burst and Its Implications