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Detects faint emission in GBM during radio burst, suggesting astrophysical significance.
Following the recent report of another bright radio burst from the magnetar SGR 1935+2154 (ATEL #15792), we searched the Fermi Gamma-ray Burst Monitor (GBM) Continuous TIME Tagged Event (CTTE) data for any untriggered enhanced emission at the time of the CHIME burst (2022-12-01 22:06:59.079 UTC, topocentric arrival time at infinite frequency). Bayesian Block and Poisson likelihood searches in the 10-100 keV range both resulted in the detection of a faint signal at 2022-12-01 22:06:58 (T0 in UTC, TT), i.e., 1 second preceding the CHIME burst. This delay is larger than the 50 ms maximum expected light travel time from CHIME/FRB site to GBM.
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Younes et al. (2022) studied this question.
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