Independent detection of the radio burst reported in ATel #13681 with STARE2

ATel #13684; C. Bochenek, S. Kulkarni, V. Ravi, D. McKenna, G. Hallinan (Caltech), & K. Belov (JPL)
on 29 Apr 2020; 03:04 UT
Credential Certification: Derek B. Fox (dfox@astro.psu.edu)

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STARE2 (Bochenek et al. 2020, PASP, 132, 034202) is a set of three radio feeds located in Goldstone, CA, Big Pine, CA, and Delta, UT with a maximum baseline of 600 km. STARE2 is sensitive to ~ms duration radio transients in the 1.4 GHz band. The data are independently collected and searched for dispersed bursts of ~1 ms duration at each station. Candidates above a threshold are detected and saved to disk in real time. Each day, candidates coincident within 100 ms are compiled and inspected by eye. An earlier than scheduled inspection of today's data was triggered by ATel #13681. We report the detection of a burst on 4/28/2020 at UTC 14:34:25 at all three stations with dispersion measure of 333.2 +/- 0.8 pc cm^-3, and preliminary inferred fluence of >1.5 MJy ms. The arrival time and the dispersion measure of this burst are consistent with those reported in ATel #13681, although we report a 1000x higher fluence than the CHIME telescope. If the reported association with SGR 1935+2154 (ATel #13681) is correct, and the source were placed at the distance of FRB 180916.J0158+65 (149 Mpc), the fluence of this burst would be >7 mJy ms. We conclude that active magnetars are a source of FRBs at extragalactic distances. We encourage follow-up observations.