INTEGRAL Limits on Past High-energy Activity from FRB 20200120E in M81

S Mereghetti,M Topinka,D Götz,M Rigoselli

doi:10.3847/2041-8213/ac2ee7

Abstract

Abstract The repeating fast radio burst FRB 20200120E is located in a globular cluster belonging to the nearby M81 galaxy. Its small distance (3.6 Mpc) and accurate localization make it an interesting target to search for bursting activity at high energies. From 2003 November to 2021 September, the INTEGRAL satellite has obtained an exposure time of 18 Ms on the M81 sky region. We used these data to search for hard X-ray bursts from FRB 20200120E using the IBIS/ISGRI instrument, without finding any significant candidate, down to an average fluence limit of ∼10−8 erg cm−2 (20–200 keV). The corresponding limit on the isotropic luminosity for a burst of duration Δt is ∼ 10 45 10 ms Δ t erg s−1, the deepest limit obtained for an extragalactic FRB in the hard X-ray range. This rules out the emission of powerful flares at a rate higher than 0.1 yr−1 that could be expected in models invoking young hyperactive magnetars.

Highlights

The discovery of an extremely bright and short radio burst from the Galactic soft gammaray repeater SGR 1935+2154 on 28 April 2020 (CHIME/FRB Collaboration et al 2020; Bochenek et al 2020), provided strong observational support to the connection between fast radio bursts (FRBs) and magnetars
Our results are based on data collected by the Imager on-board INTEGRAL (IBIS, Ubertini et al 2003)
We used the data obtained with ISGRI (INTEGRAL Soft Gamma Ray Imager, Lebrun et al 2003), the lower energy detector of IBIS, which operates in the nominal 151000 keV range and provides photon-by-photon events tagged with a time resolution of 61 μs

Summary

Introduction

The discovery of an extremely bright and short radio burst from the Galactic soft gammaray repeater SGR 1935+2154 on 28 April 2020 (CHIME/FRB Collaboration et al 2020; Bochenek et al 2020), provided strong observational support to the connection between fast radio bursts (FRBs) and magnetars. The bright FRB-like radio burst of 28 April 2020 from SGR 1935+2154 was accompanied by the simultaneous emission of hard X-rays with properties similar to those of the short bursts (duration

Results

Discussion

Conclusion