# GRB 081024B and GRB 140402A: two additional short GRBs from binary neutron star mergers

## TL;DR

This paper classifies short gamma-ray bursts into two types based on energy and black hole formation, presenting two new S-GRBs and analyzing their high-energy emissions to understand their underlying physics.

## Contribution

It introduces two additional S-GRBs, supporting the classification scheme and linking high-energy emission signatures to black hole formation in neutron star mergers.

## Key findings

- All identified S-GRBs show high-energy GeV emission.
- A common power-law behavior in GeV luminosities suggests similar black hole properties.
- No significant beaming effects are observed in the GeV emission.

## Abstract

Theoretical and observational evidences have been recently gained for a two-fold classification of short bursts: 1) short gamma-ray flashes (S-GRFs), with isotropic energy $E_{iso}<10^{52}$~erg and no BH formation, and 2) the authentic short gamma-ray bursts (S-GRBs), with isotropic energy $E_{iso}>10^{52}$~erg evidencing a BH formation in the binary neutron star merging process. The signature for the BH formation consists in the on-set of the high energy ($0.1$--$100$~GeV) emission, coeval to the prompt emission, in all S-GRBs. No GeV emission is expected nor observed in the S-GRFs. In this paper we present two additional S-GRBs, GRB 081024B and GRB 140402A, following the already identified S-GRBs, i.e., GRB 090227B, GRB 090510 and GRB 140619B. We also return on the absence of the GeV emission of the S-GRB 090227B, at an angle of $71^{\rm{o}}$ from the \textit{Fermi}-LAT boresight. All the correctly identified S-GRBs correlate to the high energy emission, implying no significant presence of beaming in the GeV emission. The existence of a common power-law behavior in the GeV luminosities, following the BH formation, when measured in the source rest-frame, points to a commonality in the mass and spin of the newly-formed BH in all S-GRBs.