First INTEGRAL observations of GRS 1915+105
D. C. Hannikainen, O. Vilhu, J. Rodriguez, S. Brandt, N. J. Westergaard, N. Lund, I. Mocoeur, Ph. Durouchoux, T. Belloni, A. Castro-Tirado, P. A. Charles, A. J. Dean, R. P. Fender, M. Feroci, P. Hakala, R. W. Hunstead, C. R. Kaiser, A. King, I. F. Mirabel, G. G. Pooley, J. Poutanen, K. Wu, A. A. Zdziarski
Abstract
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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