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ATEL # 888; E. Kuulkers (ESA/ESAC, Spain), J. Chenevez (DNSC, Denmark), S. Shaw (Southampton, UK/ ISDC, Switzerland), S. Brandt DNSC, Denmark), T. Courvoisier (ISDC, Switzerland), A. Domingo Garau (LAEFF/INTA, Spain), K. Ebisawa (ISAS, Japan), P. Kretschmar (ESA/ESAC, Spain), C. Markwardt (GSFC, USA), N. Mowlavi (ISDC, Switzerland), T. Oosterbroek (ESA/ESTEC, The Netherlands), A. Paizis (INAF-IASF, Italy),D. Risquez Oneca (LAEFF/INTA, Spain), C. Sanchez-Fernandez (ESA/ESAC, Spain), R. Wijnands (UvA, The Netherlands)
on 20 Sep 2006; 13:10 UT
Password Certification: Erik Kuulkers (firstname.lastname@example.org)
Subjects: X-ray, Gamma Ray, Binaries, Black Holes, Neutron Stars, Transients, Variables
We further analysed the INTEGRAL JEM-X observations performed on UT 2006, Sep 18, 08:30-12:12 (ATel #886) of the new hard INTEGRAL source IGR J17497-2821 (ATel #885). We find average fluxes of 31 +/- 10 mCrab and 47 +/- 12 mCrab in the 3-10 keV and 10-25 keV bands, respectively. The best-fit JEM-X position is RA = 267.405 deg, Dec = -28.356 deg (J2000.0), with a 90% confidence error of 1', consistent with that reported in ATels #885 and #886.
A joint JEM-X and IBIS/ISGRI spectral analysis shows the 3-200 keV source spectrum to be well described by a single power-law with index 1.93 +/- 0.05. The 90% confidence upper limit on the absorption column, N_H, is about 6x10^22 atoms/cm^2, consistent with the average interstellar absorption in the direction of the source. At an assumed distance of 8 kpc the 2-10 keV and 2-100 keV (unabsorbed) source luminosities are about 5x10^36 erg/s and 10^37 erg/s, respectively.
Our observations show IGR J17497-2821 to be in a low, hard, state, typically seen in black-hole candidate and neutron-star X-ray transients.