# The Rate of Short Duration Gamma-Ray Bursts in the local Universe

## TL;DR

This study constrains the local rate of short-duration gamma-ray bursts within 200 Mpc, finding no significant detections and setting upper limits on their occurrence rate based on Swift, Fermi, and BATSE data.

## Contribution

It provides the first comprehensive upper limits on the local rate of short gamma-ray bursts from multiple gamma-ray observatories, using galaxy correlation methods.

## Key findings

- No high-likelihood events detected within 200 Mpc over 14.5 years.
- Upper limit of <4 events per year for short GRBs within 200 Mpc.
- Upper limit of <3 events per year for giant flares from soft gamma-ray repeaters.

## Abstract

The binary neutron star merger responsible for the gravitational wave event, GW170817, strengthened the merger association with short-duration gamma-ray bursts (SGRBs) following the detection of the SGRB counterpart, GRB 170817A. Here we consider the constraints on a population of local gamma-ray bursts with moderately short duration ($T_{90}<4 \textrm{ s}$) and within $d < 200 \textrm{ Mpc}$, that may have originated from similar compact binary mergers. Using well localised gamma-ray bursts from $\sim14.5 \textrm{ years}$ of Swift/Burst Alert Telescope monitoring, we find no events with high likelihood of being in this distance range, and place an upper limit for the all-sky rate of such events of $<4\ \textrm{y}^{-1}$. For Fermi/Gamma-ray Burst Monitor (GBM) and CGRO/Burst And Transient Source Experiment (BATSE) detected bursts, where the localisation has considerably larger uncertainties, we cross-correlated with 2MASS Redshift Survey galaxies at $d<100 \textrm{ Mpc}$, obtaining a weaker constraint of $< 12\ \textrm{y}^{-1}$. A separate correlation search from the GBM and BATSE bursts for giant flares originating from soft gamma-ray repeaters in nearby galaxies ($d < 11 \textrm{ Mpc} $ ) yields an upper limit of $<3\ \textrm{y}^{-1}$.