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IGR J16479-4514

ATel #176; S. Molkov (IKI, Moscow), N. Mowlavi (ISDC), A. Goldwurm (CEA, Saclay), A. Strong (MPE, Garching), N. Lund (DSRI), J. Paul(CEA, Saclay), T. Oosterbroek (ESA/ESTEC)
on 11 Aug 2003; 18:52 UT
Distributed as an Instant Email Notice Request For Observations
Credential Certification: Sergei Molkov (molkov@hea.iki.rssi.ru)

Subjects: X-ray, Gamma Ray, Request for Observations, Transient

Referred to by ATel #: 599, 816

We report the discovery of a new transient source, IGR J16479-4514, with the IBIS/ISGRI detector onboard the INTEGRAL observatory. The source position is RA=16h47.9m, and DEC= -45d 14' (equinox 2000, position uncertainty around 3'). The source was detected during observations of the Galactic Center field performed between August 8 and August 9, with fluxes ~12 mCrab in the 18-25 keV band (signal to noise ratio S/N ~9) and ~8 mCrab in the 25-50 keV band (S/N ~10). During later observations performed on August 10 the source temporarily increased its activity. The source flux increased by a factor ~2: detected fluxes are ~22 mCrab in the 18-25 keV energy band (S/N~9), ~21 mCrab in the 25-50 keV band (S/N~15) and ~17 mCrab in the 50-100 keV band (S/N~6).