|
|||||
|
|
SIGMA observations of two new hard X-ray and soft gamma-ray transients: GX 354-0 and Nova Persei |
|
| Authors: | A Claret J Ballet A Goldwurm F Lebrun J P Roques L Bouchet M C Schmitz-Fraysse P Mandrou R Sunyaev E Churazov M Gilfanov N Khavenson A Dyachkov B Novikov R Kremnev V Kovtunenko |
| Institution: | * Service d'Astrophysique, C.E. Saclay, 91191, Gif-sur-Yvette Cedex, France ** Centre d'Etude Spatiale des Rayonnements, 9 Avenue du Colonel Roche, BP 4346, 31029, Toulouse Cedex, France *** Space Research Institute, Profsoyouznaya, 84/32, Moscow 117296, Russia |
| Abstract: | We report the first detection of two soft gamma ray transients GX 354-0 and Nova Persei (GRO J0422+32) by the coded-mask telescope SIGMA. Only preliminary results are presented with regard to Nova Persei while special emphasis is given to the data on GX 354-0 which has been monitored during the 1992 February–April survey of the Galactic Center. GX 354-0 underwent two flares of about two week duration and its average spectrum is well described by a thermal Bremsstrahlung model or a broken power law whereas the Nova Persei spectrum seems to be similar to the one observed for GRS 1124-684 in Musca. |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ | |