Central Bureau for Astronomical Telegrams
IAUC 3467: MXB1730-335; Notice
The following International Astronomical Union Circular may be linked-to from your own Web pages, but must not otherwise be redistributed (see these notes on the conditions under which circulars are made available on our WWW site).
Read IAUC 3468
Circular No. 3467
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
O. P. N. Calla, A. K. Sangal and S. Barathy, Space Applications
Centre, Ahmedabad, telex: "In continuation of the observations
of microwave bursts from the Rapid X-Ray Burster MXB1730-335
during 1979 Apr. (IAUC 3347) and 1979 Aug. (IAUC 3458) we again
report and confirm the microwave bursts from MXB1730-335 on 1980 Mar.
21. The shapes of the bursts are trapezoidal and similar in character
to those observed at x-ray wavelengths (cf. IAUC 3392; Inoue et
al. 1980, Nature 283, 358). The broad characteristics of the
microwave bursts observed are:
1980 UT d(b) R D A
Mar. 21d01h17m41s-21d01h18m05s 24s 2s4 2s4 0.36
21 01 32 00 -21 01 34 26 146 2.4 7.2 0.31
Here d(b) is the duration of an individual burst, R the risetime, D
the decay time and A the peak amplitude (in db). The observations
were made during Mar. 20d23h15m-21d02h30m UT at 4.1 GHz with the 14-m
parabolic antenna located at the Space Applications Centre and
associated electronics including a parametric amplifier front end.
The receiver has a total system noise temperature of 180 K. These
observations confirm that the Rapid X-Ray Burster produces bursts at
microwave frequencies that are broadly similar in characteristics to
those at x-ray wavelengths In the light of our detection of
microwave bursts from the Rapid Burster we request others to watch for
this phenomenon and to inform us if they observe emissions in x-ray,
infrared and microwave wavelengths. Our address is: Space
Applications Certre (ISRO), P.O. Jodhpur Tekra, Ahmedabad. 380053, India;
telex India 12239 SAC IN."
NOTICE TO CONTRIBUTORS
We draw attention to the resolution (b) adopted by IAU Commission
5 last August (cf. IAU Inf. Bull. No. 43, p. 19). It is recommended
that "two identifications be quoted for each object in order
to provide a check against errors and mlsprints, especially for
faint objects". This is particularly important in the case of
information that is telexed or telegraphed to the Central Bureau. One
of the identifications could be the position of the object; provision
for this has long been made in the telegraphic code, and it is
all the more necessary if a message is sent in clear.
1980 April 10 (3467) Brian G. Marsden
Read IAUC 3468
Our Web policy. Index to the CBAT/MPC/ICQ pages.
