Sigma/GRANAT soft gamma-ray observations of the X-ray nova in Musca - Discovery of positron annihilation emission line
1992; IOP Publishing; Volume: 389; Linguagem: Inglês
10.1086/186353
ISSN1538-4357
AutoresA. Goldwurm, J. Ballet, B. Cordier, Jacques Paul, L. Bouchet, J. P. Roques, D. Barret, P. Mandrou, R. Sunyaev, E. Churazov, M. Gilfanov, A. Dyachkov, N. Khavenson, V. M. Kovtunenko, R. S. Kremnev, K. G. Sukhanov,
Tópico(s)Gamma-ray bursts and supernovae
ResumoThe day after its discovery by the Watch instrument, the X-ray nova GRS 1124-684 in Musca was detected by the soft γ-ray telescope SIGMA at the limit of its field of view. SIGMA pointed the source seven other times between 1991 January and February, and GRS 1124-684 has always been detected up to 300 keV, showing it was one of the hardest objects of the sky. After the flare of January 9 the average spectrum is well fitted by a power law of index 2.38, and the light curve shows a slower decrease than observed at low energy with superposed variability on time scales of several hours
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