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The outburst of the X-ray nova GRS 1739-278 in September 2016

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Abstract

During the scanning observations of the Galactic center region in late August–September 2016 we detected a new (third) outburst of the historical X-ray nova GRS 1739-278, a presumed black hole in a low-mass X-ray binary. This was reported in the Astronomer’s Telegrams (Mereminskiy et al. 2016). In this paper we present the results of INTEGRAL and Swift observations of the outburst development. According to these observations, the flux from the source in the hard X-ray band (20–60 keV) rose from ~11 (September 3) to ~30 mCrab (September 14), was at the attained level for ~8 days, and then returned to ~15 mCrab. The spectrum of the source taken at its peak brightness in the energy range 0.5–150 keV could be fitted by a single power law with a photon index of 1.86 ± 0.07 distorted only by photoabsorption corresponding to the hydrogen column density log10 (N H) = 22.37 under the assumption of a solar abundance. This means that the source at this time was in the low/hard state. Infrared observations with the RTT-150 telescope near the X-ray brightness peak of the source revealed no emission down to \(22_ \cdot ^m 0\) (in the r’ band) and \(20_ \cdot ^m 9\) (in the i’ band). At the time of writing the paper we do not yet know whether this outburst ended or only its initial stage was observed. If it ended, then based on the light curve and spectra, we can state that it was a “failed” outburst, i.e., the amount of accreted matter in this episode was insufficient to reach the high or very high state with a soft blackbody component in the spectrum characteristic of developed outbursts.

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Correspondence to I. A. Mereminskiy.

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Original Russian Text ©I.A. Mereminskiy, E.V. Filippova, R.A. Krivonos, S.A. Grebenev, R.A. Burenin, R.A. Sunyaev, 2017, published in Pis’ma v Astronomicheskii Zhurnal, 2017, Vol. 43, No. 3, pp. 194–202.

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Mereminskiy, I.A., Filippova, E.V., Krivonos, R.A. et al. The outburst of the X-ray nova GRS 1739-278 in September 2016. Astron. Lett. 43, 167–174 (2017). https://doi.org/10.1134/S1063773717030057

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  • DOI: https://doi.org/10.1134/S1063773717030057

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