FRB131104 Swift BAT data revisited: No evidence of a gamma-ray counterpart

Abstract

We present a re-analysis of the Swift Burst Alert Telescope (BAT) data around the radio detection of FRB 131104. Possible evidence of a gamma-ray counterpart was presented by DeLaunay et al. However, based on our analysis using all the available BAT data, no significant emission is found in either the temporal or the image domain. We place a 5~sigma fluence upper limit of 3.3 $\times$ 10${}^{-6}$ erg cm${}^{-2}$ and 2.7 $\times$ 10${}^{-6}$ erg cm${}^{-2}$ (15-150 keV) with an integration time of 300 s assuming a simple power-law spectrum with photon index of -1.2 and -2.0, respectively. Our result does not support the association of this FRB with a high-energy counterpart, in agreement with growing observational evidence that most FRBs are not associated to catastrophic events such as gamma-ray bursts.

arXiv comment12 pages, 5 figures, accepted for publication in ApJ

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• Constraining Near-Simultaneous Radio Emission from Short Gamma-ray Bursts using CHIME/FRB
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