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XTE J1701−407 is a new transient X‐ray source discovered on 2008 June 8. More than one month later, it showed a rare type of thermonuclear explosion: a long type I X‐ray burst. We report herein the results of our study of the spectral and flux evolution during this burst, as well as the analysis of the outburst in which it took place. We find an upper limit on the distance to the source of 6.1 kpc by considering the maximum luminosity reached by the burst. We measure a total fluence of  3.5 × 10 −6  erg cm −2   throughout the ∼20 min burst duration and a fluence of  2.6 × 10 −3  erg cm −2   during the first two months of the outburst. We show that the flux decay is best fitted by a power law (index ∼1.6) along the tail of the burst. Finally, we discuss the implications of the long burst properties, and the presence of a second and shorter burst detected by  Swift  ten days later, for the composition of the accreted material and the heating of the burning layer.

The Swift capture of a long X‐ray burst from XTE J1701−407