The Swift Discovery of X-ray Afterglows Accompanying Short Bursts from   SGR 1900+14
  The discovery of X-ray afterglows accompanying two short bursts from SGR 1900+14 is presented. The afterglow luminosities at the end of each observation are lower by 30-50% than their initial luminosities, and decay with power law indices p ~ 0.2-0.4. Their initial bolometric luminosities are L ~ 10^34-10^35 erg s^-1. We discuss analogies and differences between the X-ray afterglows of SGR short bursts and short gamma-ray bursts. 
Y. E. Nakagawa, T. Sakamoto, G. Sato, N. Gehrels, K. Hurley, and D. M.   Palmer