Swift follow-up of 13 INTEGRAL sources

Abstract

Abridged : The various IBIS/ISGRI catalogues contain a large population of hard X-ray sources whose nature is still unknown. Even if the $>20$ keV positional uncertainty provided by ISGRI is unprecedented, it is still too large to pinpoint the counterpart at other wavelengths, which is the only secure way of obtaining a source identification. We continue the work of trying to reveal the nature of these hard X-ray sources, starting with analysis of X-ray data collected via focusing X-ray telescopes, in order to obtain arcsec accurate X-ray positions. We can then identify counterparts at infrared and optical wavelengths and try to unveil the nature of the sources. We analysed data from observations of 13 \integral\ sources made with the \swift\ satellite. The X-ray images obtained by the X-Ray Telescope instrument allowed us to find possible counterparts to the IGR sources with a positional accuracy of a few arcsec. We then browsed the online catalogues to search for counterparts at other wavelengths. We also made use of the X-ray spectral parameters in trying to identify the nature of those objects. For the 13 objects, we found possible counterparts at X-ray energies and identified the IR/optical and/or UV counterparts as seen with \swift/UVOT. We also discuss the likelihood of association of the X-ray and \integral\ source in each case.

11 pages, 2 figures, accepted for publication in A&A, version corrected after A&A language editing

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• The 4th IBIS/ISGRI soft gamma-ray survey catalog
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• A deep INTEGRAL hard X-ray survey of the 3C 273/Coma region
• Swift follow-up observations of 17 INTEGRAL sources of uncertain or unknown nature
• The nature of the X-ray binary IGR J19294+1816 from INTEGRAL, RXTE, and Swift observations
• Revealing the nature of new unidentified INTEGRAL sources

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• The INTEGRAL/IBIS AGN catalogue I: X-ray absorption properties versus optical classification
• Unveiling the nature of INTEGRAL objects through optical spectroscopy. VIII. Identification of 44 newly detected hard X-ray sources
• Unveiling the nature of INTEGRAL objects through optical spectroscopy. X. A new multi-year, multi-observatory campaign
• Infrared identification of high-mass X-ray binaries discovered by INTEGRAL
• Does the obscured AGN fraction really depend on luminosity?
• INTEGRAL/IBIS 17-yr hard X-ray all-sky survey
• The nature of fifty Palermo Swift-BAT hard X-ray objects through optical spectroscopy
• Chandra observations of five INTEGRAL sources: new X-ray positions for IGR J16393-4643 and IGR J17091-3624
• Diverse Long-Term Variability of Five Candidate High-Mass X-ray Binaries from Swift Burst Alert Telescope Observations
• A New Sample of Obscured AGNs Selected from the XMM-Newton and AKARI Surveys
• On the Rarity of X-Ray Binaries with Naked Helium Donors
• Investigating the nature of IGR J17454-2919 using X-ray and Near-Infrared observations
• Investigating the Optical Counterpart Candidates of Four INTEGRAL Sources localized with Chandra