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We report on the  Swift  detection of a thermonuclear X‐ray burst from the very‐faint quasi‐persistent neutron star X‐ray binary XMMU J174716.1–281048, which triggered the satellite’s Burst Alert Telescope (BAT) on 2010 August 13. Analysis of the BAT spectrum yields an observed bolometric peak flux of ≃4.5 × 10 −8  erg cm −2  s −1 , from which we infer a source distance of ≲8.4 kpc. Follow‐up observations with  Swift ’s X‐ray Telescope (XRT) suggest that the event had a duration of ≃3 h and a total radiated energy of ≃9 × 10 40  erg, which classify it as an intermediately long X‐ray burst. This is only the second X‐ray burst ever reported from this source. Inspection of  Swift /XRT observations performed between 2007 and 2010 suggests that the 2–10 keV accretion luminosity of the system is ≃5 × 10 34  erg s −1  for an assumed distance of 8.4 kpc. Despite being transient, XMMU J174716.1–281048 appears to have been continuously active since its discovery in 2003.

Swift detection of an intermediately long X‐ray burst from the very faint X‐ray binary XMMU J174716.1–281048