A new hard X-ray transient discovered by INTEGRAL: IGR J17494-3030

R. Boissay, J. Chenevez, E. Bozzo, C. Ferrigno*, V. Grinberg, J. Wilms, I. Caballero, M. Cadolle-Bel, M. Del Santo, M. Fiocchi, L. Kuiper, A. Paizis, L. Sidoli, G. Puehlhofer, V. Sguera, K. Watanabe, J. Enright, E. Graham, K. Jacob, D. Rusk

*Corresponding author for this work

Research output: Other contributionNet publication - Internet publicationResearch


INTEGRAL discovered a new hard X-ray transient, IGR J17494-3030, during the Galactic center observations performed from 2012-03-17 07:20 to 2012-03-19 21:17 UTC (PI J. Wilms). The source is detected in the IBIS/ISGRI mosaic at a significance level of 9 σ (on-source time 200 ks) in the 20-40 keV energy band and 6 σ in the 40-80 keV one. The corresponding fluxes are 5.9±0.6 mCrab and 6±1 mCrab (4.5±0.5 × 10-11 and 1.2±0.2 × 10-11 erg/s/cm2, uncertainties are at 68% c.l.). The source is also detected by JEM-X at a significance level of 6 σ in the 3-10 keV energy band and 3 σ in the 10-25 keV energy band. The corresponding fluxes are 4.1±0.7 mCrab (7±1 × 10-11 erg/s/cm2) and 5.2±1.7 mCrab (4.7±1.5 × 10-11 erg/s/cm2), respectively (effective exposure time 72 ks). The best source position determined with the two JEM-X instruments is RA= 267.35 (17h 49m 24s) DEC= -30.50 (-30d 30' 00") (J2000) with an associated pointing uncertainty of 1.3 arcmin (the Galactic coordinates are l= 358.23 b=-2.025). The IBIS/ISGRI spectrum can be described (χ2red/d.o.f.=0.6/4) by a power-law (Γ=1.7 ± 1.0, uncertainty at 90% c.l.). The 20-60 keV flux estimated from the spectral fit is 7.6 × 10-11 erg/s/cm2. Multi-wavelength follow-up observations are encouraged to unveil the nature of this transient.
Original languageEnglish
Publication date20 Mar 2012
Publication statusPublished - 20 Mar 2012
SeriesThe Astronomer's telegram
NumberATel #3984


  • X-ray
  • Gamma ray
  • Binary
  • Black hole
  • Neutron star
  • Transient


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