Central Bureau for Astronomical Telegrams
IAUC 3294: MXB1730-335; 1978m; 1978o
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Circular No. 3294
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM Telephone 617-864-5758
MXB1730-335
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.
COMET SEARGENT (1978m)
Precise positions by M. P. Candy, Perth Observatory:
1978 UT R. A. (1950) Decl.
Oct. 3.86743 11 53 27.85 -40 32 37.9
4.85153 11 52 15.34 -42 08 38.6
5.85313 11 50 58.98 -43 47 25.5
5.85771 11 50 58.67 -43 47 51.7
7.85284 11 48 16.32 -47 08 30.6
9.86323 11 45 14.21 -50 36 37.3
COMET BRADFIELD (1978o)
Precise position by D. Herald, Kambah, near Canberra:
1978 UT R. A. (1950) Decl.
Oct. 18.75281 11 26 47.68 -35 18 26.6
1978 October 24 (3294) Brian G. Marsden
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