Discovery of a bright radio transient in M 82: a new radio supernova?A. Brunthaler, K. M. Menten, M. J. Reid, C. Henkel, G. C. Bower and H. FalckeA&A, 499 2 (2009) L17-L20DOI: https://doi.org/10.1051/0004-6361/200912327