Papers › Simultaneous X-ray and Radio Observations of the Repeating Fast Radio Burst FRB 180916.J0158+65
Simultaneous X-ray and Radio Observations of the Repeating Fast Radio Burst FRB 180916.J0158+65
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
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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-σ limit of <5×10⁻¹⁰ erg cm⁻² for the 0.5--10 keV fluence of prompt emission at the time of the radio burst and 1.3×10⁻⁹ 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∼0.034), these correspond to energy limits of <1.6×10⁴⁵ erg and <4×10⁴⁵ erg, respectively. We also place a 5-σ limit of <8×10⁻¹⁵ 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 <2×10⁴⁰ 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 4×10⁻⁹ 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.
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