Abstract
Bo 375 in M31 contains one of the most luminous (2-5 × 10(38) erg s(-1) ) globular cluster X-ray sources in the Local Group. In a recent ACIS-S survey, we discovered that the source may be extended. We request one 5 ksec HRC-I observation to test whether the source can be resolved and one 10 ksec observation with ACIS-S to study its spectrum, which is heavily piled up in the survey data. The observations we propose will help determine if Bo 375 houses multiple bright sources and will provide input for physical models. We also request HST observations (1 orbit) to study the morphology of the cluster.