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Reverberation lags have recently been discovered in a handful of nearby,variable AGN. Here, we analyze a ~100 ksec archival XMM-Newton observation ofthe highly variable AGN, ESO 113-G010 in order to search for lags between hard,1.5 - 4.5 keV, and soft, 0.3 - 0.9 keV, energy X-ray bands. At the lowestfrequencies available in the lightcurve (<1.5E-4 Hz), we find hard lags wherethe power-law dominated hard band lags the soft band (where the reflectionfraction is high). However, at higher frequencies in the range (2-3)E-4 Hz wefind a soft lag of -325 +/- 89 s. The general evolution from hard to soft lagsas the frequency increases is similar to other AGN where soft lags have beendetected. We interpret this soft lag as due to reverberation from the accretiondisk, with the reflection component responding to variability from the X-raycorona. For a black hole mass of 7E6 M(solar) this corresponds to alight-crossing time of ~9 R_g/c, however, dilution effects mean that theintrinsic lag is likely longer than this. Based on recent black holemass-scaling for lag properties, the lag amplitude and frequency are moreconsistent with a black hole a few times more massive than the best estimates,though flux-dependent effects could easily add scatter this large.

A soft X-ray reverberation lag in the AGN ESO 113-G010