Swift/XRT follow-up observations of unidentified INTEGRAL/IBIS sources

TL;DR

This study uses Swift/XRT follow-up observations to identify and classify previously unknown or unstudied gamma-ray sources from the INTEGRAL/IBIS survey, improving positional accuracy and enabling multi-wavelength analysis.

Contribution

The paper presents new X-ray observations that identify and classify four unidentified INTEGRAL sources, providing more precise positions and potential nature of these sources.

Findings

IGR J1248.2-5828 is a Seyfert 1.9 galaxy.

IGR J14080-3023 is classified as a Seyfert 1.5.

A likely counterpart was found for IGR J12123-5802, but further data is needed.

Abstract

Many sources listed in the 4th IBIS/ISGRI survey are still unidentified, i.e. lacking an X-ray counterpart or simply not studied at lower energies (< 10 keV). The cross-correlation between the list of IBIS sources in the 4th catalogue and the Swift/XRT data archive is of key importance to search for the X-ray counterparts; in fact, the positional accuracy of few arcseconds obtained with XRT allows us to perform more efficient and reliable follow-up observations at other wavelengths (optical, UV, radio). In this work, we present the results of the XRT observations for four new gamma-ray sources: IGR J12123-5802, IGR J1248.2-5828, IGR J13107-5626 and IGR J14080-3023. For IGR J12123-5802 we find a likely counterpart, but further information are needed to classified this object, IGR J1248.2-5828 is found to be a Seyfert 1.9, for IGR J13107-5626 we suggest a possible AGN nature, while IGR J14080-3023 is classified as a Seyfert 1.5 galaxy.