The XMM-Newton Slew view of IGRJ17361-4441: a transient in the globular cluster NGC 6388

TL;DR

This paper reports on XMM-Newton slew observations of the transient IGRJ17361-4441 in the globular cluster NGC 6388, providing spectral analysis and comparison with previous data to understand its X-ray properties.

Contribution

The study offers new spectral data from XMM-Newton slews and compares it with prior observations, enhancing understanding of the transient's X-ray behavior.

Findings

Maximum unabsorbed X-ray flux is approximately 4.5×10⁻¹¹ erg cm⁻² s⁻¹.

XMM-Newton slew spectrum is marginally consistent with previous high-energy observations.

Spectral index varies between 0.93 and 1.63, indicating spectral changes.

Abstract

IGRJ17361-4441 is a hard transient recently observed by the INTEGRAL satellite. The source, close to the center of gravity of the globular cluster NGC 6388, quickly became the target of follow-up observations conducted by the Chandra, Swift/XRT and RXTE observatories. Here, we concentrate in particular on a set of observations conducted by the XMM-Newton satellite during two slews, in order to get the spectral information of the source and search for spectral variations. The spectral parameters determined by the recent XMM-Newton slew observations were compared to the previously known results. The maximum unabsorbed $X$-ray flux in the 0.5-10 keV band as detected by the XMM-Newton slew observations is $\simeq 4.5\times 10^{-11}$ erg cm$^{-2}$ s$^{-1}$, i.e. consistent with that observed by the Swift/XRT satellite 15 days earlier. The spectrum seems to be marginally consistent ($\Gamma\simeq 0.93-1.63$) with that derived from the previous high energy observation.