A new hard X-ray source discovered by INTEGRAL: IGR J16442-554

E. Bozzo, C. Ferrigno, J. Chenevez, M. Del Santo, A. De Rosa, M. Fiocchi, A. Tarana, P. Ubertini, S. Corbel, D. Goetz, L. Prat, J.-A. Zurita-Heras, M. Ranaud, S. Mereghetti, A. Paizis, L. Sidoli, P. R. den Hartog, L. Kuiper, I. Negueruela, S. PirainoG. Weidenspointner, K. Watanabe

Research output: Other contributionNet publication - Internet publicationResearch


During a key program observation of the inner Galactic disc performed between 2009-08-30 14:04 and 2009-09-01 12:03 (UTC), a new source was discovered in the INTEGRAL/IBIS mosaic image. The best localization is RA: 251.088 DEC: -55.808, with a 90% error radius of 3.6 arcmin. The source, IGR J16442-5548, is detected with a significance of 7 sigma in the 20-40 keV energy band and of 5 sigma in the 40-100 keV energy band. The corresponding flux is about 7 mCrab. The source is not detected in the JEM-X monitor: upper limits at 3 sigma c.l. are respectively 2 and 5 mCrab in the 3-10 keV and 10-25 keV energy bands. The IBIS/ISGRI spectrum in the 20-100 keV energy range is well described by a power-law with photon index 2.2+/-0.5. The 20-100 keV flux is 1.2e-10 erg/cm^2/s. The light curve exhibits pronounced variability on a few hours time scale. We did not find any previously known X-ray source in the Simbad database within the INTEGRAL error box. A Swift follow-up is ongoing and multi-wavelength observations are encouraged.
Original languageEnglish
Publication date2 Sep 2009
Publication statusPublished - 2 Sep 2009
SeriesThe Astronomer´s Telegram
NumberATel #2185


  • Transients
  • Gamma Ray
  • X-ray


Dive into the research topics of 'A new hard X-ray source discovered by INTEGRAL: IGR J16442-554'. Together they form a unique fingerprint.

Cite this