The first direct detections of Gravitational Waves (GWs) has brought astronomy into a new era of discovery. The search for electromagnetic counterparts to GW sources is now more important than ever before. BurstCube will be a 6U CubeSat (10 cm x 20 cm x 30 cm) composed of 4 scintillator detectors read out by arrays of silicon photomultipliers. BurstCube will automatically detect gamma-ray transients onboard (astrophysical, solar, and terrestrial), sending rapid alerts to the ground to enable follow-up observations. BurstCube is currently in development and will lauch in the early 2020s.