Swift/XRT observations of newly discovered INTEGRAL sources

TL;DR

This study uses Swift/XRT archival data and multi-wavelength observations to identify and analyze the X-ray counterparts of four newly discovered INTEGRAL sources, revealing their likely classifications and highlighting the importance of precise localization.

Contribution

The paper demonstrates the effectiveness of Swift/XRT in accurately identifying and characterizing the counterparts of newly discovered INTEGRAL sources, providing insights into their nature.

Findings

SWIFT J1508.6-4953 is likely a Blazar.

IGR J22534+6243 is probably a High-Mass X-ray Binary.

Two sources may be contaminated by nearby X-ray sources, requiring optical follow-up.

Abstract

With respect to the recent INTEGRAL/IBIS 9-year Galactic Hard X-ray Survey (Krivonos et al. 2012), we use archival Swift/XRT observations in conjunction with multi-wavelength information to discuss the counterparts of a sample of newly discovered objects. The X-ray telescope (XRT, 0.3-10 keV) on board Swift, thanks to its few arcseconds source location accuracy, has been proven to be a powerful tool with which the X-ray counterparts to these IBIS sources can be searched for and studied. In this work, we present the outcome of this analysis by discussing four objects (SWIFT J0958.0-4208, SWIFT J1508.6-4953, IGR J17157-5449, and IGR J22534+6243) having either X-ray data of sufficient quality to perform a reliable spectral analysis or having interesting multiwaveband properties. We find that SWIFT J1508.6-4953 is most likely a Blazar, while IGR J22534+6243 is probably a HMXB. The remaining two objects may be contaminated by nearby X-ray sources and their class can be inferred only by means of optical follow-up observations of all likely counterparts.