{"about":{"site":"https://codewithpapers.app","non_affiliation":"Code with Papers and Syntology are not affiliated with, endorsed by, or sponsored by Papers with Code, Meta, or the pwc-archive mirror.","licence":"CC BY-SA 4.0","licence_url":"https://creativecommons.org/licenses/by-sa/4.0/legalcode","attribution":"https://codewithpapers.app/attribution","modified":"archive material modified by Syntology; see the attribution page"},"url":"/paper/simultaneous-x-ray-and-radio-observations-of-1","title":"Simultaneous X-ray and Radio Observations of the Repeating Fast Radio Burst FRB 180916.J0158+65","arxiv_id":"2004.06082","date":"2020-04-13","proceeding":null,"authors":["P. Scholz","A. Cook","M. Cruces","J. W. T. Hessels","V. M. Kaspi","W. A. Majid","A. Naidu","A. B. Pearlman","L. Spitler","K. M. Bandura","M. Bhardwaj","T. Cassanelli","P. Chawla","B. M. Gaensler","D. C. Good","A. Josephy","R. Karuppusamy","A. Keimpema","A. Yu. Kirichenko","F. Kirsten","J. Kocz","C. Leung","B. Marcote","K. Masui","J. Mena-Parra","M. Merryfield","D. Michilli","C. J. Naudet","K. Nimmo","Z. Pleunis","T. A. Prince","M. Rafiei-Ravandi","M. Rahman","K. Shin","K. M. Smith","I. H. Stairs","S. P. Tendulkar","K. Vanderlinde"],"abstract":"We report on simultaneous radio and X-ray observations of the repeating fast radio burst source FRB 180916.J0158+65 using the Canadian Hydrogen Intensity Mapping Experiment (CHIME), Effelsberg, and Deep Space Network (DSS-14 and DSS-63) radio telescopes and the Chandra X-ray Observatory. During 33 ks of Chandra observations, we detect no radio bursts in overlapping Effelsberg or Deep Space Network observations and a single radio burst during CHIME/FRB source transits. We detect no X-ray events in excess of the background during the Chandra observations. These non-detections imply a 5-$\\sigma$ limit of $<5\\times10^{-10}$ erg cm$^{-2}$ for the 0.5--10 keV fluence of prompt emission at the time of the radio burst and $1.3\\times10^{-9}$ erg cm$^{-2}$ at any time during the Chandra observations at the position of FRB 180916.J0158+65. Given the host-galaxy redshift of FRB 180916.J0158+65 ($z\\sim0.034$), these correspond to energy limits of $<1.6\\times10^{45}$ erg and $<4\\times10^{45}$ erg, respectively. We also place a 5-$\\sigma$ limit of $<8\\times10^{-15}$ erg s$^{-1}$ cm$^{-2}$ on the 0.5--10\\,keV absorbed flux of a persistent source at the location of FRB 180916.J0158+65. This corresponds to a luminosity limit of $<2\\times10^{40}$ erg s$^{-1}$. Using Fermi/GBM data we search for prompt gamma-ray emission at the time of radio bursts from FRB 180916.J0158+65 and find no significant bursts, placing a limit of $4\\times10^{-9}$ erg cm$^{-2}$ on the 10--100 keV fluence. We also search Fermi/LAT data for periodic modulation of the gamma-ray brightness at the 16.35-day period of radio-burst activity and detect no significant modulation. We compare these deep limits to the predictions of various fast radio burst models, but conclude that similar X-ray constraints on a closer fast radio burst source would be needed to strongly constrain theory.","url_abs":"http://arxiv.org/abs/2004.06082v1","url_pdf":"http://arxiv.org/pdf/2004.06082v1.pdf","source":{"archive":"pwc-archive (Hugging Face), CC BY-SA 4.0","snapshot":"2025-07-28","licence_url":"https://creativecommons.org/licenses/by-sa/4.0/legalcode","row_kind":"links_only","authors_date_abstract":"arXiv metadata, CC0 1.0 (https://info.arxiv.org/help/license), from the Kaggle arXiv metadata snapshot of 2026-09-12"},"code_links":[{"paper_slug":"simultaneous-x-ray-and-radio-observations-of-1","repo_url":"https://github.com/KshitijAggarwal/frbpa","is_official":0,"mentioned_in_paper":0,"mentioned_in_github":1,"framework":"none","reach":null}],"tasks":[],"methods":[],"datasets_introduced":[],"methods_introduced":[],"results":[],"syntology":{"syntology_url":null,"atlas_url":null,"mcp":null,"developers":"https://syntology.ai/developers"},"arxiv_metadata":null,"syntology_extracted_results":null}