Nova MUSCAE 1991

R. Sunyaev on behalf of the Granat team (Space Research Institute, Moscow; Danish Space Research Institute, Lyngby) reports: "The WATCH instrument detected a gradual increase of the 10- to 30-keV flux of GRS 1124-684 (Nova Mus 1991) from 0.9 Crab on Jan. 8.5 UT up to 2.0 Crab on Jan. 10.2. During Jan. 12-14 the average source flux stabilized at 1.9 Crab. During observations between Jan. 16 and 21, the source was found at a level of 0.5 Crab; thereafter, the source flux increased to 1.3 Crab between Jan. 21 and 22 and kept this level until observation on Jan. 25. Variations of intensity up to about 2-3 times on a timescale of several hr were detected by both the ART-P and WATCH instruments above 10 keV, while the soft component below 10 keV was relatively less variable during ART-P observations." Corrigenda to IAUC 5176: line 3, for Sigma (at 30 keV) and ART-P (30 keV) read SIGMA (at energies > 30 keV) and ART-P (< 30 keV) line 17, for on Jan. 9-10 at 30 keV read on Jan. 9-10 above 30 keV