1 National Space Institute, Technical University of Denmark2 Astrophysics, National Space Institute, Technical University of Denmark3 unknown
GX 354-0 (also known as 4U 1728-34) has been monitored by INTEGRAL as part of the Galactic Center Deep Exposure almost continuously from 2004-02-16 until now. Over that period the source flux measured by IBIS/ISGRI between 20-60 keV featured a smooth increase with a maximum flux of 0.2 Crab measured on February 24th. The source flux then decreased by a factor of 5 on a time scale of one week. Below 10 keV the flux measured by JEM-X increased by a factor larger than 6 continuously on a timescale of 3 weeks. The current flux (2004-03-08) measured by JEM-X in the 3-10 keV band is 0.5 Crab. The INTEGRAL monitoring will continue for several days.