Limits on the hard x-ray emission from the periodic fast radio burst FRB 180916.J0158+65

Sibasish Laha*, Zorawar Wadiasingh, Tyler Parsotan, Amy Lien, George Younes, Bing Zhang, S. Bradley Cenko, Eleonora Troja, Samantha Oates, Matt Nicholl, Eileen Meyer, Josefa Becerra González, Ritesh Ghosh, Noel Klingler

*Corresponding author for this work

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FRB 180916.J0158+65 is one of the nearest, periodically repeating, and actively bursting fast radio bursts (FRBs) that has been localized to the outskirts of a spiral galaxy. In this work we study the FRB with the hard X-ray 14-195 keV data from the Burst Alert Telescope (BAT) on board The Neil Gehrels Swift Observatory. BAT uses coded mask technology giving a localization of 23′ in the hard X-ray band, along with an accurate background estimation. BAT has been observing the source location in survey mode since 2020 February. The survey mode observations involve background subtracted spectra, integrated over a time span ranging 300-2000 s at the source location (from 2022 February-2022 January). We analyzed all the ∼230 survey mode observations from BAT and checked for any signal in any of the observations. We did not detect any signal at >5σ confidence level in any of the observations. We could estimate a 5σ upper limit on the 14-195 keV flux, which ranged between 4.5 × 10-10-7.6 × 10-9 erg cm-2 s-1. At the source distance this relates to a 5σ upper limit on a luminosity of 5.08 × 1044-8.5 × 1045 erg s-1. With this estimate, we could rule out any persistent X-ray emission at the source location for these snapshots of BAT observations.

Original languageEnglish
Article number173
Number of pages8
JournalAstrophysical Journal
Issue number2
Early online date20 Apr 2022
Publication statusPublished - 27 Apr 2022

Bibliographical note

Funding Information:
The material is based upon work supported by NASA under award No. 80GSFC21M0002. E.T. acknowledges support from NASA grant 80NSSC18K0429. M.N. is supported by the European Research Council (ERC) under the European Unions Horizon 2020 research and innovation program (grant agreement No. 948381) and by a Fellowship from the Alan Turing Institute.

Publisher Copyright:
© 2022. The Author(s). Published by the American Astronomical Society.


  • Radio transient sources

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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