The longest thermonuclear X-ray burst ever observed? (A BeppoSAX Wide   Field Camera observation of 4U 1735-44)
  A long flux enhancement, with an exponential decay time of 86 min, is detected in 4U 1735-44 with the BeppoSAX Wide Field Cameras. We argue that this is a type-I X-ray burst, making it the longest such burst ever observed. Current theories for thermonuclear bursts predict shorter and more frequent bursts for the observed persistent accretion rate. 
R. Cornelisse (SRON, Utrecht Univ.), J. Heise (SRON), E. Kuulkers   (SRON, UU), F. Verbunt (UU), J.J.M. in 't Zand (SRON)