Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010astl...36..895c&link_type=abstract
Astronomy Letters, Volume 36, Issue 12, pp.895-903
Astronomy and Astrophysics
Astronomy
2
X-Ray Transients, X-Ray Bursters
Scientific paper
Details of the discovery (in February 2004) and results of subsequent (in 2004-2009) INTEGRAL observations of the transient X-ray burster IGR J17380-3749 (IGR J17379-3747) are presented. Over the period of its observations, the INTEGRAL observatory recorded two hard X-ray flares and one type I X-ray burst from the source, which allowed the nature of IGR J17380-3749 to be determined. The burster radiation spectrum during the flares was hard—a power law with a photon index α = 1.8-2.0 or bremsstrahlung corresponding to a plasma with a temperature kT = 90-140 keV. The spectral shape at the flare peaks turned out to be the same, despite a more than twofold difference in flux (the peak flux recorded in the energy range 18-100 keV reached ˜20 mCrab). The upper limit on the flux from the source in its quiescent (off) state in the range of 18-40 keV was 0.15 mCrab (3 σ).
Chelovekov I. V.
Grebenev Sergei A.
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