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tokens: The authors thank Jamie Kennea and Phil Evans of the Swift team for their help with the analysis of the Swift /XRT follow-up observations; Kevin Hurley and the IPN team for their efforts to triangulate GRB 160530A, which helped plan the Swift /XRT observations; Varun Bhalerao and Dipankar Bhattacharya with the Astrosat team for helping cross-calibrate COSI’s timing performance with Astrosat; the NASA Columbia Scientific Ballooning Facility team for successfully flying (and landing) COSI and making this work possible. COSI is funded by NASA grant NNX14AC81G-APRA. The Swift Guest Observer analysis is supported through NASA grant NNH15ZDA001N-SWIFT. This work is also supported in part by CNES. Software: GEANT4 (Agostinelli et al. 2003 ), MINUIT (James Roos 1975 ), MEGAlib (Zoglauer et al. 2006 ), ROOT (Brun Rademakers 1997 ).