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Classical novae (CNe) have been found to represent the major class ofsupersoft X-ray sources (SSS) in our neighbour galaxy M 31. We determineproperties and evolution of the two first SSSs ever discovered in the M 31globular cluster (GC) system. We have used XMM-Newton, Chandra and Swiftobservations of the centre region of M 31 to discover both SSS and to determinetheir X-ray light curves and spectra. We performed detailed analysis ofXMM-Newton EPIC PN spectra of the source in Bol 111 (SS1) using blackbody andNLTE white dwarf (WD) atmosphere models. For the SSS in Bol 194 (SS2) we usedoptical monitoring data to search for an optical counterpart. Both GC X-raysources were classified as SSS. We identify SS1 with the CN M31N 2007-06brecently discovered in the M 31 GC Bol 111. For SS2 we did not find evidencefor a recent nova outburst and can only provide useful constraints on the timeof the outburst of a hypothetical nova. The only known CN in a M 31 GC can beidentified with the first SSS found in a M31 GC. We discuss the impact of ourobservations on the nova rate for the M 31 GC system.

The first two transient supersoft X-ray sources in M 31 globular clusters and the connection to classical novae