Reproducing GW150914: the first observation of gravitational waves from a binary black hole merger

In February 2016, LIGO and Virgo announced the first observation of gravitational waves from a binary black hole merger, known as GW150914. To establish the confidence of this detection, large-scale scientific workflows were used to measure the event's statistical significance. These workflows used code written by the LIGO Scientific Collaboration and Virgo and were executed on the LIGO Data Grid. The codes used to perform these analyses are publicly available, but there has not yet been an attempt to directly reproduce the results, although several subsequent analyses have replicated the analysis, confirming the detection. In this paper, we attempt to reproduce the result from the compact binary coalescence search presented in the GW150914 discovery paper using publicly available code executed primarily on the Open Science Grid. We show that we reproduce the original result, discuss the challenges we encountered, and make recommendations for scientists who wish to make their work reproducible.