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INTEGRAL sees a rising flux from the historical X-ray nova GRS 1739-278

ATel #9517; I. Mereminskiy, R. Krivonos, S. Grebenev, E. Filippova, R. Sunyaev (Space Research Institute/IKI, Moscow)
on 20 Sep 2016; 17:29 UT
Credential Certification: Sergei Grebenev (sergei@hea.iki.rssi.ru)

Subjects: X-ray, Request for Observations, Black Hole, Transient

Referred to by ATel #: 9541, 10137

During recent INTEGRAL observations of the Galactic Center field (PI Sunyaev) we detected the positive hard X-ray flux from the X-ray nova and black hole candidate GRS 1739-278. The source was first discovered with Granat/SIGMA during its intense outburst in 1996 (Vargas et al., 1997, Borozdin et al., 1998). The previous known outburst of the source was observed by Swift-BAT (ATel #5986) and INTEGRAL (ATel #5991) in 2014.

According to our analysis of the current IBIS/ISGRI data, the 20-60 keV flux from the source raised from 15.4(+-1.4) to 30(+-1.4) mCrab between September 7 and 18, 2016. This may indicate the beginning of the new outburst of GRS 1739-278. INTEGRAL will continue monitoring of this region.

We encourage follow-up observations of the source at all wavelengths.