Flux decay during thermonuclear X-ray bursts analysed with the dynamic power-law index method J. Kuuttila, J. J. E. Kajava, J. Nättilä, S. E. Motta, C. Sánchez-Fernández, E. Kuulkers, A. Cumming and J. Poutanen A&A, 604 (2017) A77 Published online: 09 August 2017 DOI: 10.1051/0004-6361/201730823