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INTEGRAL caught a new outburst from IGR J17464-3213

ATel #6474; L. Ducci (ISDC, Switzerland), J. Rodriguez (CEA, France), V. Grinberg (MIT, Cambridge USA) , E. Kuulkers (ESA/ESAC, Spain), E. Bozzo (ISDC, Switzerland)
on 15 Sep 2014; 20:23 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Jerome Rodriguez (jrodriguez@cea.fr)

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

Referred to by ATel #: 6502, 8751

During the observation of the Galactic Center performed from 2014 September 13 at 03:25 to September 15 at 04:18 (UTC), the IBIS/ISGRI and JEM-X instruments on board INTEGRAL detected renewed activity from the black-hole candidate IGR J17464-3213 (H 1743-322).

The source was detected in the IBIS/ISGRI mosaic at a significance level of 50 (67) sigma and a flux of 51+/-1 mCrab (67+/-1 mCrab) in the 20-40 keV (40-80 keV) energy band. The source was detected by JEM-X at a significance level of 11 sigma in the 3-10 keV energy band and 8 sigma in the 10-20 keV energy band.
The estimated fluxes from the JEM-X mosaics were 14+/-1 mCrab in the 3-10 keV energy band and 20+/-2 mCrab in the 10-20 keV energy band.

The average JEM-X + ISGRI spectrum (effective exposure time 97 ks for ISGRI and 49 ks for JEM-X) can be reasonably well described (chi2_red/d.o.f.=1.1/41) by an absorbed power law with photon index 1.61+/-0.04 (we fixed the absorption column density at N_H=2E22 cm-2, as previously reported, e.g., in Shidatsu et al. 2014, ApJ, 789, 100). Uncertainties are given at 90% c.l.
The estimated flux from the spectral fit was 1.1E-09 ergs/cm2/s in the energy range 20 - 100 keV and 6E-10 ergs/cm2/s in the 3 - 20 keV energy range.

These results thus suggest that IGR J17464-3213 is in the standard low-hard state, usually found in the early stages of BH outbursts and known to be associated with compact jets.

Further INTEGRAL observations in the direction of the source are planned for September 21. Observations at other wavelengths are encouraged.