A rapidly variable narrow X-ray iron line in Mkn 841 P. O. Petrucci, G. Henri, L. Maraschi, P. Ferrando, G. Matt, M. Mouchet, C. Perola, S. Collin, A. M. Dumont, F. Haardt and L. Koch-Miramond A&A, 388 1 (2002) L5-L8 Published online: 28 May 2002 DOI: 10.1051/0004-6361:20020534