First INTEGRAL observations of GRS 1915+105

Details First INTEGRAL observations of GRS 1915+105 First INTEGRAL observations of GRS 1915+105

2003-09-19

arxiv.org/abs/astro-ph/0309532v1

Astron.Astrophys.411:L415-L420,2003

Astronomy and Astrophysics

Astrophysics

5 pages, 7 figures. The original Figure 2 in color can be obtained from http://www.astro.helsinki.fi/~diana/integral.html. Acc

Scientific paper

10.1051/0004-6361:20031444

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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