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MAXI/GSC detected a superburst from EXO 1745-248 in the globular clusterTerzan 5 on 2011 October 24. The GSC light curve shows an exponential decaywith an e-folding time of 0.3 day. The spectra are consistent with theblackbody radiation, whose temperature is 2.2 keV and 1.2 keV at MJD 55858.56and 55859.20, respectively. The fluence is $1.4 \times 10^{42}$ erg in 2-20 keVassuming 8.7 kpc distance. The sphere radius of the blackbody and itsluminosity are estimated to be 6.2 km and $1.1 \times 10^{38}$ erg s$^{-1}$,respectively, from the spectral fitting at the flux peak. Those e-folding time,temperature, softening, fluence, and radius are typical of superbursts from thelow-mass X-ray binaries. The superburst was followed by an outburst 28 hoursafter the superburst onset. The outburst lasted for 5 days and the fluence was$4.3 \times 10^{42}$ erg. The instability of the accretion disk caused by thesuperburst would be an explanation for the outburst, whereas the mass accretionof the matter evaporated from surface of the companion star by the superburstwould be another possibility.

Superburst with Outburst from EXO 1745-248 in Terzan 5 with MAXI