Constraining the transient high-energy activity of FRB 180916.J0158+65 with Insight-HXMT follow-up observations
Abstract
Context. A link has finally been established between magnetars and fast radio burst (FRB) sources. Within this context, a major issue that remains unresolved pertains to whether sources of extragalactic FRBs exhibit X/γ-ray outbursts and whether this is correlated with radio activity. If so, the subsequent goal is to identify these sources.
Aims: We aim to constrain possible X/γ-ray burst activity from one of the nearest extragalactic FRB sources currently known. This is to be done over a broad energy range by looking for bursts over a range of timescales and energies that are compatible with those of powerful flares from extragalactic magnetars.
Methods: We followed up on the observation of the as-yet nearest extragalactic FRB source, located at a mere 149 Mpc distance, namely, the periodic repeater
Results: We constrain the possible occurrence of flares in the 1-100 keV energy band to E < 1046 erg for durations Δ t < 0.1 s over several tens of ks exposure.
Conclusions: We can rule out the occurrence of giant flares similar to the ones that were observed in the few cases of Galactic magnetars. The absence of reported radio activity during our observations prevents us from making any determinations regarding the possibility of simultaneous high-energy emission.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- October 2020
- DOI:
- 10.1051/0004-6361/202039129
- arXiv:
- arXiv:2008.11965
- Bibcode:
- 2020A&A...642A.160G
- Keywords:
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- radiation mechanisms: non-thermal;
- stars: magnetars;
- Astrophysics - High Energy Astrophysical Phenomena
- E-Print:
- 10 pages, 3 figures, accepted by A&