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We report observations using the Swift/XRT, NuSTAR, and Chandra X-raytelescopes of the transient X-ray source CXOGC J174540.0-290005, during its2013 outburst. Due to its location in the field of multiple observing campaignstargeting Sgr A*, this is one of the best-studied outbursts of a very faintX-ray binary (VFXB; peak $L_X<10^{36}$ erg/s) yet recorded, with detections in173 ks of X-ray observations over 50 days. VFXBs are of particular interest,due to their unusually low outburst luminosities and time-averaged masstransfer rates, which are hard to explain within standard accretion physics andbinary evolution. The 2013 outburst of CXOGC J174540.0-290005 peaked at$L_X$(2-10 keV)=$5.0\times10^{35}$ erg/s, and all data above $10^{34}$ ergs/swere well-fit by an absorbed power-law of photon index $\sim1.7$, extendingfrom 2 keV out to $\sim$70 keV. We discuss the implications of theseobservations for the accretion state of CXOGC J174540.0-290005.

The 2013 outburst of a transient very faint X-ray binary, 23" from Sgr A*