GROND coverage of the main peak of gamma-ray burst 130925A J. Greiner, H.-F. Yu, T. Krühler, D. D. Frederiks, A. Beloborodov, P. N. Bhat, J. Bolmer, H. van Eerten, R. L. Aptekar, J. Elliott et al. (16 more) A&A, 568 (2014) A75 Published online: 20 August 2014 DOI: 10.1051/0004-6361/201424250