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dc.contributor.authorBharali, Priya
dc.contributor.authorChandra, Sunil
dc.contributor.authorBöttcher, Markus
dc.contributor.authorChauhan, Jaiverdhan
dc.contributor.authorGarcía, Javier A.
dc.identifier.citationBharali, P. et al. 2019. Re-awakening of GRS 1716-249 after 23 yr, observed by Swift/XRT and NuSTAR. Monthly notices of the Royal Astronomical Society, 487(3):3150-3161. []en_US
dc.identifier.issn1365-2966 (Online)
dc.description.abstractIn this work, we present a spectral and temporal analysis of Swift/XRT and 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 yr, since its last major outburst in 1993. The source was observed over two different epochs during 2017 April 7 and 10. The best-fitting joint spectral fitting in the energy range 0.5–79.0 keV indicates that the spectrum is best described by relatively cold, weak disc blackbody emission, dominant thermal Comptonization emission, and a relativistically broadened fluorescent iron K α emission line. We observed a clear indication of a Compton hump around 30 keV. We also detected an excess feature of 1.3 keV. Assuming a lamp-post geometry of the corona, we constrained the inner disc radius for both observations to 11.92+8.62 −11.92 RISCO (i.e. an upper limit) and 10.39+9.51 −3.02 RISCO (where RISCO ≡ radius of the innermost stable circular orbit) for the first epoch (E1) and second epoch (E2), respectively. A significant (5σ) type C quasi-periodic oscillation (QPO) at 1.20 ± 0.04 Hz is detected for the first time for GRS 1716–249, which drifts to 1.55 ± 0.04 Hz (6σ) at the end of the second observation. The derived spectral and temporal properties show a positive correlation between the QPO frequency and the photon indexen_US
dc.publisherOxford Univ Pressen_US
dc.subjectAccretion discsen_US
dc.subjectBlack hole physicsen_US
dc.subjectX-rays: binariesen_US
dc.subjectX-rays: individual: GRS 1716-249en_US
dc.titleRe-awakening of GRS 1716-249 after 23 yr, observed by Swift/XRT and NuSTARen_US
dc.contributor.researchID31125417 - Chandra, Sunil
dc.contributor.researchID24420530 - Böttcher, Markus

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