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 \simeq 4.5 \times 10 ^ { -8 } ~ { } \mathrm { erg~ { } cm } ^ { -2 } ~ { } \mathrm { s } ^ { -1 } , from which we infer a source distance of \lesssim 8.4 kpc .
Follow-up observations with Swift ’ s X-ray Telescope ( XRT ) suggest that the event had a duration of \simeq 3 h and a total radiated energy of \simeq 9 \times 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 2007–2010 suggests that the 2–10 keV accretion luminosity of the system is \simeq 5 \times 10 ^ { 34 } ~ { } \mathrm { 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 .