The Swift Discovery Of X-ray Afterglows Accompanying Short Bursts From Sgr 1900+14

摘要

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.