Galactic Radio Explorer: an all-sky monitor for bright radio bursts

Abstract

We present the Galactic Radio Explorer (GReX), an all-sky monitor to probe the brightest bursts in the radio sky. Building on the success of STARE2, we will search for fast radio bursts (FRBs) emitted from Galactic magnetars as well as bursts from nearby galaxies. GReX will search down to ten microseconds time resolution, allowing us to find new super giant radio pulses from Milky Way pulsars and study their broadband emission. The proposed instrument will employ ultra-wide band (0.7-2 GHz) feeds coupled to a high performance (receiver temperature 10 K) low noise amplifier (LNA) originally developed for the DSA-110 and DSA-2000 projects. In GReX Phase I (GReX-I), unit systems will be deployed at Owens Valley Radio Observatory (OVRO) and Big Smoky Valley, Nevada. Phase II will expand the array, placing feeds in India, Australia, and elsewhere in order to build up to continuous coverage of nearly 4$\pi$ steradians and to increase our exposure to the Galactic plane. We model the local magnetar population to forecast for GReX, finding the improved sensitivity and increased exposure to the Galactic plane could lead to dozens of FRB-like bursts per year.

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• Testing afterglow models of FRB 200428 with early post-burst observations of SGR 1935+2154
• Fast radio bursts at the dawn of the 2020s
• How limiting is optical follow-up for fast radio burst applications? Forecasts for radio and optical surveys
• Detecting Fast Radio Bursts in the Milky Way
• A nanosecond-duration radio pulse originating from the defunct Relay 2 satellite
• GReX: An Instrument Overview and New Upper Limits on the Galactic FRB Population