the cluster core to identify the positions of known cluster sources, which we shift ($\Delta$RA=+0.008s, $\Delta$Dec=+0.31) to align with the (ICRS) astrometry of @Pooley02b. We estimated (by eye) the center of the symmetric “hole” in the counts by matching circles to the doughnut-shaped locus of maximum countrate in the LMXB halo, in both wavebands. Our result is (J2000) RA=17:48:52.76(2), Dec=-20:21:24.0(1) (1$\sigma$ values, after our astrometric correction), giving it the IAU name CXOGlb J174852.7-202124, and (for shorthand) NGC 6440 X-2. Detailed analysis of the remaining cluster sources will be presented elsewhere.

To measure the spectrum and luminosity of the transient, we extracted a spectrum from the readout streak, excluding a 20” radius circle around the piled-up transient. Background was extracted from rectangular regions above and below the readout streak, computed response functions for the position of the transient, and corrected the exposure time of the spectrum. We binned the spectrum to 60 counts per bin to improve its statistics, and excluded data over 8 keV and below 0.5 keV. An absorbed power-law fits the data (Table 1, Fig. \[fig:spectrum\]), with photon index 1.7$\pm0.1$. We found no evidence for a 6.4 or 6.7 keV iron line, with a 90% upper limit of 