Multiwavelength approach to classifying transient events in the direction of M 31Monika D. Soraisam, Marat Gilfanov, Thomas Kupfer, Thomas A. Prince, Frank Masci, Russ R. Laher and Albert K. H. KongA&A, 615 (2018) A152DOI: https://doi.org/10.1051/0004-6361/201732068