Title:	GReX: An Instrument Overview and New Upper Limits on the Galactic FRB Population
Authors:	Shila, Kiran A Niedbalski, Sashabaw Connor, Liam Kulkarni, Shrinivas R Segev, Larom Shukla, Priya Keane, Evan F McCauley, Joseph Johnson, Owen A Watters, Brendan Farah, Wael Pollak, Alexander W Belov, Konstantin Tang, Honglue Huai, Zhaoyu Chatterjee, Shami Corde, James M
Keywords:	Astronomical instrumentation Radio bursts
Issue Date:	7-Jul-2025
Publisher:	Publications of the Astronomical Society of the Pacific
Citation:	Publications of the Astronomical Society of the Pacific , 2025, Vol. 137(7), AR No. 075001
Abstract:	We present the instrument design and initial results for the Galactic Radio Explorer, an all-sky monitor for exceptionally bright transients in the radio sky. This instrument builds on the success of STARE2 to search for fast radio bursts (FRBs) from the Milky Way and its satellites. This instrument has deployments across the globe, with wide sky coverage and searching down to 32 μs time resolution, enabling the discovery of new super giant pulses. Presented here are the details of the hardware and software design of the instrument, performance in sensitivity and other key metrics, and experience in building a global-scale, low-cost experiment. We follow this discussion with experimental results on validation of the sensitivity via hydrogen-line measurements. We then update the rate of Galactic FRBs based on non-detection in the time since FRB 200428. Our results suggest FRB-like events are even rarer than initially implied by the detection of a MJy burst from SGR J1935+2154 in 2020 April.
Description:	Open Access. Also available at arXiv.org (one of the alternative locations)
URI:	http://hdl.handle.net/2289/8646
ISSN:	1538-3873
Alternative Location:	https://ui.adsabs.harvard.edu/abs/2025PASP..137g5001S/abstract https://doi.org/10.48550/arXiv.2504.18680 http://doi.org/10.1088/1538-3873/ade401
Copyright:	2025 The Author(s)
Appears in Collections:	Research Papers (A&A)

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