NuSTAR observations of wind-fed X-ray pulsar GX 301–2 during unusual spin-up event Armin Nabizadeh, Juhani Mönkkönen, Sergey S. Tsygankov, Victor Doroshenko, Sergey V. Molkov and Juri Poutanen A&A, 629 (2019) A101 Published online: 11 September 2019 DOI: 10.1051/0004-6361/201936045