# Search for Very High Energy Emission from Gamma-Ray Bursts using Milagro

## TL;DR

This study used the Milagro detector to search for very high energy gamma-ray emission from 106 GRBs detected since 2000, but found no evidence and set upper limits on such emissions.

## Contribution

First comprehensive search for VHE emission from a large sample of GRBs using Milagro, providing upper limits in the 100 GeV to 100 TeV range.

## Key findings

- No VHE emission detected from any GRB in the sample.
- Set upper limits on VHE gamma-ray flux from GRBs.
- Demonstrated the sensitivity of Milagro for future VHE GRB searches.

## Abstract

Gamma-Ray Bursts (GRBs) have been detected at GeV energies by EGRET and models predict emission at > 100 GeV. Milagro is a wide field (2 sr) high duty cycle (> 90 %) ground based water Cherenkov detector that records extensive air showers in the energy range 100 GeV to 100 TeV. We have searched for very high energy emission from a sample of 106 gamma-ray bursts (GRB) detected since the beginning of 2000 by BATSE, BeppoSax, HETE-2, INTEGRAL, Swift or the IPN. No evidence for emission from any of the bursts has been found and we present upper limits from these bursts.