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von Kienlin et al. (2019) selected 11 short gamma-ray bursts (sGRBs) whosecharacteristics are similar to GRB 170817A. These bursts, like GRB 170817A,have a hard spike followed by a soft thermal tail. However, as their redshiftsare unknown it is not clear if their luminosities are as low as that of GRB170817A. Comparing the positions in the $\epsilon_{\rm p}$-$E_{\rm\gamma,iso}$(spectral peak energy - isotropic-equivalent energy) plane and usingcompactness arguments to estimate the minimal Lorentz factor, $\Gamma$, we findthat all the bursts in this sample are consistent with being regular sGRBs ifthey are located at $z\simeq0.3-3$. They are also consistent with being similarto GRB 170817A if they are located at $z\lesssim0.1$. Even in the latter case,the events must involve at least mildly relativistic ($\Gamma \gtrsim 2$)motion within the sources. We, further, find that at most one or two bursts inthe sample are consistent with the cocoon shock-breakout model. Finally, wecalculate the event rate of either off-axis emission from a jet core or from ajet-wing (surrounding the core). We find that the off-axis emission model as anorigin of the sample is rejected as it predicts too small event rate. The wingmodel can be consistent with the observed rate but the model parameters cannotbe constrained by the current observations.

On short GRBs similar to GRB 170817A detected by Fermi GBM