Chandra X-ray observations of the fast radio burst repeater FRB 180916.J0158+65
ATel #13589; A. K.H. Kong, K. L. Li (NTHU), C. Y. Hui (CNU), H. F. Yu (HKU)
on 25 Mar 2020; 14:37 UT
Credential Certification: Albert Kong (akong@phys.nthu.edu.tw)
Subjects: X-ray, Fast Radio Burst
We report on archival Chandra X-ray observations of the repeating fast radio burst FRB 180916.J0158+65. Chandra observed the FRB on 2019 December 3 and 18 each with 16 ks exposure time (ObsIDs 23081 and 23082). At the position of the FRB (Marcote et al. 2020), there is no significant X-ray photon from the source. We combined the two observations and obtained a 3-sigma flux (0.3-10 keV) limit of 5e-15 erg/cm^2/s by assuming an absorbed powerlaw model with N_H=4.3e21 cm^-2 (Galactic absorption; HI4PI Collaboration 2016) and a photon index of 2. This corresponds to a persistent X-ray luminosity limit of 1.7e40 erg/s for a source distance of 150 Mpc. Compared with the Swift XRT observations taken in 2020 February (ATel #13446,#13462), the upper limit of the Chandra observations is an order of magnitude lower. Furthermore, we do not detect any X-ray emission from the host galaxy SDSS J015800.28+654253.0.
