AGILE Observations of Fast Radio Bursts
F. Verrecchia, C. Casentini, M. Tavani, A. Ursi, S. Mereghetti, M., Pilia, M. Cardillo, A. Addis, G. Barbiellini, L. Baroncelli, A. Bulgarelli,, P.W. Cattaneo, A. Chen, E. Costa, E. Del Monte, A. Di Piano, A. Ferrari, V., Fioretti, F. Longo, F. Lucarelli, N. Parmiggiani

TL;DR
This study conducted a 13-year search for high-energy emissions coinciding with fast radio bursts using AGILE satellite data, finding no significant detections but setting upper limits on possible emissions.
Contribution
First comprehensive search for high-energy counterparts to FRBs using AGILE data, establishing upper limits and analyzing both repeating and non-repeating sources.
Findings
No significant MeV or GeV emission detected from FRBs.
Upper limits on energy emission comparable to giant magnetar flares.
Nearby FRBs emit more radio energy than some magnetar flares.
Abstract
We report on a systematic search for hard X-ray and gamma-ray emission in coincidence with fast radio bursts (FRBs) observed by the AGILE satellite. We used 13 years of AGILE archival data searching for time coincidences between exposed FRBs and events detectable by the MCAL (0.4-100 MeV) and GRID (50 MeV-30 GeV) detectors at timescales ranging from milliseconds to days/weeks. The current AGILE sky coverage allowed us to extend the search for high-energy emission preceding and following the FRB occurrence. We considered all FRBs sources currently included in catalogues, and identified a sub-sample (15 events) for which a good AGILE exposure either with MCAL or GRID was obtained. In this paper we focus on non-repeating FRBs, compared to a few nearby repeating sources. We did not detect significant MeV or GeV emission from any event. Our hard X-ray upper limits (ULs) in the MeV energy…
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