MXB1730-335
Abstract
J. van Paradijs, L. Cominsky and W. H. G. Lewin, Massachusetts Institute of Technology, report that the Rapid Burster MXB1730-335 has again become active as expected. This is the fifth time since the discovery in 1976 Mar. than an active period has been observed, and it is further evidence that the activity comes regularly at intervals of about 6.5 months (Marshall et al. 1979, Astrophys. J. Jan. in press). SAS-3 observations show that the source was still inactive on 1978 Sept. 3.9 UT (pointed observations). Observations between Oct. 11.0 and 13.7 show that the source had become active. The total useful exposure on the source during this period was only ~ 640 s (the satellite was spinning); the number of bursts detected on consecutive days between Oct. 11.0 and 13.7 was 1, 0 and 4 (in 0.7 day). SAS-3 was pointed at the Rapid Burster between Oct. 13.8 and 16.6, during which time bursts were observed at a rate of ~ 80 per hour. In addition to the abundant type II bursts, type I bursts were recorded on Oct. 14d12h05m02s, 15d10h26m44s and probably 16d12h49m29s UT. Several bursts were probably missed due to poor data transmission and earth occultation. At least three type I bursts were detected during the period Oct. 13.8-16.6 UT from the nearby burst source MXB1728-34.
- Publication:
-
International Astronomical Union Circular
- Pub Date:
- October 1978
- Bibcode:
- 1978IAUC.3294....1V