First INTEGRAL observations of GRS 1915+105

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机构：
[1] Hannikainen, D.C.
[2] 1,Vilhu, O.
[3] 2,Rodriguez, J.
[4] Brandt, S.
[5] Westergaard, N.J.
[6] Lund, N.
[7] Mocœur, I.
[8] Durouchoux, Ph.
[9] Belloni, T.
[10] Castro-Tirado, A.
[11] Charles, P.A.
[12] Dean, A.J.
[13] Fender, R.P.
[14] Feroci, M.
[15] Hakala, P.
[16] Hunstead, R.W.
[17] Kaiser, C.R.
[18] King, A.
[19] Mirabel, I.F.
[20] Pooley, G.G.
[21] Poutanen, J.
[22] Wu, K.
[23] Zdziarski, A.A.
来源：
Hannikainen, D.C. (diana@astro.helsinki.fi) | 1600年 / EDP Sciences卷 / 411期
关键词：
Gamma rays - Light absorption - Luminescence - Satellite observatories - Space research - Spectrum analysis - Telescopes - X rays;
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摘要：
We present data from the first of six monitoring Open Time observations of GRS 1915+105 undertaken with the orbiting INTEGRAL satellite. The source was clearly detected with all three X-ray and gamma-ray instruments on board. GRS 1915+105 was in a highly variable state, as demonstrated by the JEM X-2 and ISGRI lightcurves. These and simultaneous RXTE/PCA lightcurves point to a novel type of variability pattern in the source. In addition, we fit the combined JEM X-2 and ISGRI spectrum between 3-300 keV with a disk blackbody + powerlaw model leading to typical parameter values found earlier at similar luminosity levels. A new transient, IGR J19140+098, was discovered during the present observation.
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