Nova MUSCAE 1991
Abstract
R. Sunyaev, E. Jourdain and A. Goldwurm on behalf of the SIGMA/ GRANAT Team (Space Research Institute, Moscow; Service d'Astrophysique, Centre d'Etudes Nucleaires de Saclay; Centre d'Etude Spatiale des Rayonnements, Toulouse) report: "Further analysis of the Jan. 20-21 observation of Nova Mus 1991 (GRS 1124-684) with the SIGMA telescope onboard GRANAT has shown that the transient spectral feature reported on IAUC 5176 is compatible with a line near 500 keV. The line width is consistent with the instrument spectral resolution (about 40 keV at 500 keV). The line flux is about 3 x 10E-3 photons sE-1 cmE-2. A clear excess (4.5 standard deviations), compatible with the optical position of Nova Mus 1991, is visible in the image derived in the 470- to 550-keV band during last 16 hr of observation (i.e., when the line was detected). The line was not detected during the first third of the 24-hr observation, nor during the next 24-hr observation of this source on Feb. 1-2."
- Publication:
-
International Astronomical Union Circular
- Pub Date:
- February 1991
- Bibcode:
- 1991IAUC.5201....1S