Central Bureau for Astronomical Telegrams
IAUC 3204: Prob. N IN LMC; MXB1730-335; 1978e
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Circular No. 3204
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Cable Address: SATELLITES, NEWYORK Telex: 921428
Telephone: (617) 864-5758
PROBABLE NOVA IN LARGE MAGELLANIC CLOUD
J. A. Graham, Cerro Tololo Interamerican Observatory, reports
that he has discovered a probable nova in the Large Magellanic
Cloud on a plate taken by H. Rojas as shown below. The object is
5' north of HV 12749.
1978 UT R. A. (1975) Decl. Mag.
Mar. 29 5 05.8 -65 55 12
MXB1730-335
G. Jernigan, J. McClintock, H. Marshall, M. Chartres, J.
Hoffman and W. Lewin, Massachusetts Institute of Technology, report
that the Rapid Burster MXB1730-335 has recently become burst-active.
No bursts were detected from this source during continuous SAS-3
observations (pointing mode) between Mar. 8.5 and 16.0 UT (IAUC 3190).
Since Mar. 18.5 UT the SAS-3 Observatory has observed the source
for only ~ 35 seconds every ~ 94 min (scanning mode). A total of
51 bursts were detected between Mar. 18.5 and 29.5 UT. Some bursts
were as short as ~ 5 seconds in duration, others in excess of 10
seconds. These bursts were undoubtedly coming from MXB1730-335,
and it is concluded that the turn-on must have been between Mar.
16.0 and 18.5 UT. The number of bursts detected on consecutive
days from Mar. 18.5 to 29.5 was 3, 3, 1, 2, 2, 2, 5, 3 (three-quarters
of the data lost), 10, 9 and 11. The total exposure to
the source in one day is ~ 500 seconds. The Rapid Burster was in
the scan plane of HEAO 1 on Mar. 14, and bursts should therefore
have been detected by this satellite. HEAO 1 will be pointed at
the object on Mar. 31.75 UT, and several more pointings are planned
thereafter. For more information on these plans telephone Hoffman
or Lewin at (617) 253-7525 or (617) 253-4282.
PERIODIC COMET TSUCHINSHAN 1 (1978e)
The following precise position has been measured by C.-Y. Shao
from an exposure by G. Schwartz and himself at the Agassiz Station:
1978 UT R. A. (1950) Decl.
Mar. 8.03685 3 06 10.10 +14 52 47.4
1978 March 31 (3204) Brian G. Marsden
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