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INTEGRAL confirms the brightening of 4U 1724-307

ATel #241; A. Bodaghee (ISDC, Geneva); Niels-Joergen Westergaard (DSRI, Copenhagen); F. Capitano (IASF, Roma); B. McBreen (UC Dublin); J-P Roques (CESR, Toulouse); E. Kuulkers (ESTEC, Noordwijk); S. Molkov (IKI, Moscow); G. G. C. Palumbo (Universita di Bologna)
on 19 Feb 2004; 09:40 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 #: 1395

During an observation of the Galactic Center Deep Exposure performed between February 17 (07:03 UTC) and February 18 (00:01 UTC), JEM-X on board INTEGRAL detected a bright source at position (J2000) RA=17:27:34 DEC=-30:47.9 (1 arcmin uncertainty) corresponding to 4U 1724-307. The source varies between 50 and 100 mCrab on time scales of hours in both the 3-10 and 10-30 keV bands. Between 3 and 20 keV the photon index is 2.7+/-0.4 and the flux is F(3-20)=8E-10 erg/s/cm2. This confirms the report by Markwardt et al (ATEL#237).