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Rapid Hard X-Ray Variability in GRO J0422+32

Published online by Cambridge University Press:  25 May 2016

F. van der Hooft
Affiliation:
University of Amsterdam, The Netherlands
J. van Paradijs
Affiliation:
University of Amsterdam, The Netherlands
M. Van Der Klis
Affiliation:
University of Amsterdam, The Netherlands
C. Kouveliotou
Affiliation:
USRA and NASA/MSFC, USA
D.J. Crary
Affiliation:
USRA and NASA/MSFC, USA
M.H. Finger
Affiliation:
USRA and NASA/MSFC, USA
B.C. Rubin
Affiliation:
RIKEN Institute, Japan
B.A. Harmon
Affiliation:
NASA/MSFC, USA
G.J. Fishman
Affiliation:
NASA/MSFC, USA
W.H.G. Lewin
Affiliation:
MIT, USA

Extract

The soft X-ray transient (SXT) GRO J0422+32 (Nova Persei 1992) was detected with the Burst And Transient Source Experiment (BATSE) on board the CGRO on 1992 August 5 (Paciesas et al. 1992) (Truncated Julian Day [TJD] 8839). The source intensity of GRO J0422+32 increased rapidly, reaching a flux of ~ 3 Crab (40-230 keV) within days after its first detection (Harmon et al. 1992). Hereafter, the X-ray intensity of the source decreased exponentially with a decay time of ~ 43 days (Vikhlinin et al. 1995). A secondary maximum of the X-ray intensity was reached at TJD 8978, 139 days after the first detection of the source. The daily averaged flux history of GRO J0422+32 in the 40-150 keV energy band is presented in Figure 1.

Type
Session 3: Diagnostics of High Gravity Objects with X- and Gamma Rays
Copyright
Copyright © Kluwer 1998 

References

Harmon, B.A. et al., 1992, IAUC, 5584 Google Scholar
Paciesas, W.S. et al. 1992, IAUC, 5580 Google Scholar
Vikhlinin, A. et al. 1995, ApJ, 441, 779 CrossRefGoogle Scholar

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