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IGR J17591-2342: a new X-ray transient discovered by INTEGRAL

ATel #11941; L. Ducci (IAAT, Germany; ISDC, Switzerland), E. Kuulkers (ESA/ESTEC, Netherlands, on behalf of the Galactic Center proposal team), V. Grinberg (IAAT, Germany), A. Paizis, L. Sidoli (INAF-IASF Milano, Italy), E. Bozzo, C. Ferrigno, V. Savchenko (ISDC, Switzerland)
on 12 Aug 2018; 10:06 UT
Credential Certification: E. Bozzo (enrico.bozzo@unige.ch)

Subjects: X-ray, Transient

Referred to by ATel #: 11942, 11946, 11954, 11957, 11970, 11981, 12000, 12004

During the observations performed in satellite revolution 1986 (spanning from 2018-08-10 15:50 to 2018-08-11 12:30 UT) toward the direction of the Galactic center, a new X-ray transient was detected by the instruments on-board INTEGRAL.

The best position determined by IBIS/ISGRI is at:

RA, Dec (J2000): 269.78662 -23.712973,

with an associated uncertainty of 3 arcmin.

According to the INTEGRAL convention, we named the new transient IGR J17591-2342.

The new source is detected in the 20-40 keV (40-80 keV) mosaic realized by using all the science windows collected in the direction of the Galactic Center and Galactic Bulge at a significance of 8.7 sigma (7.7 sigma). The estimated flux of the source from the mosaic is of 13.5+/-1.5 mCrab in the 20-40 keV energy band and 21.5+/-2.7 in the 40-80 keV energy band. These values correspond to roughly 1.0E-10 erg/cm^2/s and 1.6E-10 erg/cm^2/s, respectively.

The ISGRI spectrum could be preliminary described by a power-law of photon index 2.9+/-0.5. The flux measured from the spectral fit in the 20-100 keV energy band was 4.3E-10 erg/cm^2/s.

The source was located at the rim of the JEM-X field of view and not detected by this instrument.

Additional INTEGRAL observation of the field around the new transient are planned for 2018 August 17. A Swift/XRT ToO observation has been requested.