Re-awakening of GRS 1716--249 after 23 years, observed by {\it Swift}/XRT and {\it NuSTAR}

Abstract

In this work, we present a spectral and temporal analysis of {\it Swift}/XRT and {\it NuSTAR} observations of GRS 1716--249 during its recent 2016--2017 outburst. This low mass X-ray binary underwent an extraordinary outburst after a long quiescence of 23 years, since its last major outburst in 1993. The source was observed over two different epochs during 2017 April, 07 and 10. The best fit joint spectral fitting in the energy range 0.5 $-$ 79.0 keV indicates that the spectrum is best described by relatively cold, weak disk blackbody emission, dominant thermal Comptonization emission, and a relativistically broadened fluorescent iron K$\alpha$ emission line. We observed a clear indication of a Compton hump around 30 keV. We also detected an excess feature of $\sim 1.3$ keV. Assuming a lamp-post geometry of the corona, we constrained the inner disk radius for both observations to 11.92${}_{-11.92}^{+8.62}$ R${}_{ISCO}$ (i.e., an upper limit) and 10.39${}_{-3.02}^{+9.51}$ R${}_{ISCO}$ (where R${}_{ISCO}\equiv$ radius of the innermost stable circular orbit) for the first epoch (E1) and second epoch (E2), respectively. A significant ($\sim 5\sigma$) type$-$C quasi-periodic oscillation (QPO) at $1.20\pm 0.04$ Hz is detected for the first time for GRS 1716--249, which drifts to $1.55\pm 0.04$ Hz ($\sim 6\sigma$) at the end of the second observation. The derived spectral and temporal properties show a positive correlation between the QPO frequency and the photon index.

Accepted for publication by MNRAS

References in corpus (13)

• X-ray Properties of Black-Hole Binaries
• Modelling the behaviour of accretion flows in X-ray binaries
• Relativistic X-ray Lines from the Inner Accretion Disks Around Black Holes
• The role of the reflection fraction in constraining black hole spin
• A quasi-periodic modulation of the iron line centroid energy in the black hole binary H 1743-322
• Geometrical constraints on the origin of timing signals from black holes
• No Time for Dead Time: Timing analysis of bright black hole binaries with NuSTAR
• Tomographic reflection modelling of quasi-periodic oscillations in the black hole binary H 1743-322
• Phase-resolved spectroscopy of low frequency quasi-periodic oscillations in GRS 1915+105
• Comprehensive Analysis of RXTE Data from Cyg X-1: Spectral Index-Quasi-Periodic Oscillation Frequency-Luminosity Correlations
• Testing the performance and accuracy of the RELXILL model for the relativistic X-ray reflection from accretion disks
• Correlations between X-ray Spectral and Timing Characteristics in Cyg X-2
• The NuSTAR View of a QPO Evolution of GRS 1915+105

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• Broad-band spectral study of X-ray transient MAXI J1820+070 using Swift/XRT and NuSTAR
• Accretion Flow Properties of GRS 1716-249 during its 2016-17 'failed' Outburst
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• Multi-wavelength view of the galactic black-hole binary GRS 1716-249
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