GRB 121123A: Swift detection of a burst with optical counterpart. Helder, E. A. ; Barthelmy, S. D. ; D'Elia, V. ; Evans, P. A. ; Marshall, F. E. ; Mountford, C. J. ; Page, K. L. ; Palmer, D. M. Abstract Publication: GRB Coordinates Network Pub Date: 2012 Bibcode: 2012GCN.13982....1H