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The LMXRB GX354-0 is flaring in the hard X-rays

ATel #248; Juan Zurita (ISDC Geneva), Angela Bazzano (IASF Roma), Soren Brandt (DSRI Copenhagen), Albert Domingo (LAEFF Madrid), Christoph Winkler (ESA/ESTEC Noordwijk), Serguei Grebenev (IKI Moscow)
on 9 Mar 2004; 12:23 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Roland Walter (Roland.Walter@obs.unige.ch)

Subjects: X-ray, Gamma Ray, Binary, Neutron Star, Transient

Referred to by ATel #: 255, 1030

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.