First INTEGRAL observations of GRS 1915+105

D.C. Hannikainen, O. Vilhu, J. Rodriguez, Søren Brandt, Niels Jørgen Stenfeldt Westergaard, Niels Lund, I. Mocour, P. 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. PooleyJ. Poutanen, Kehuai Wu, A.A. Zdziarski

Research output: Contribution to journalJournal articleResearchpeer-review


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 JEMX-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.
Original languageEnglish
JournalAstronomy & Astrophysics
Issue number1
Pages (from-to)L415-L419
Publication statusPublished - 2003
Externally publishedYes


  • X-rays : GRS 1915+105
  • X-rays : binaries

Cite this

Hannikainen, D. C., Vilhu, O., Rodriguez, J., Brandt, S., Westergaard, N. J. S., Lund, N., Mocour, I., Durouchoux, P., Belloni, T., Castro-Tirado, A., Charles, P. A., Dean, A. J., Fender, R. P., Feroci, M., Hakala, P., Hunstead, R. W., Kaiser, C. R., King, A., Mirabel, I. F., ... Zdziarski, A. A. (2003). First INTEGRAL observations of GRS 1915+105. Astronomy & Astrophysics, 411(1), L415-L419.