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IAUC 2959: SN IN IC 1231; MX1553-54; X-RAY BURSTS; Poss. IR COUNTERPART OF MXB1730-335

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IAUC number 

                                                  Circular No. 2959
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
Western Union: RAPID SATELLITE CAMBMASS


SUPERNOVA IN IC 1231
     B. Szeidl, Konkoly Observatory, cables that Paparo has discovered
a supernova 35" east and 35" south of the nucleus of IC 1231.
On June 1 the photographic magnitude was 14.5.


MX1553-54
     F. Walter, Massachusetts Institute of Technology, reports that
the SAS-3 Group has discovered an x-ray source of intensity 0.03
that of the Crab (at 2-11 keV) at R.A = 15h53m55s, Decl. = -54o15'.9
(equinox 1950.0; 3-sigma error radius 1'.5).  This position is 1'.0 from SAO
243166 and 2'.1 from TT Nor, the former, a B0I star, being by far
the more probable optical counterpart.  The observations were made
with the SAS-3 modulation collimators during 1975 June 15-19.


X-RAY BURSTS
     R. Z. Sagdeev, Space Research Institute, Moscow, reports that
A. S. Melioranskij has refined the positions of the hard x-ray
burst sources reported by Babushkina et al. (1975, COSPAR paper A.
1.4; Pis'ma Astron. Zh. 1, No. 2, 20 and 1, No. 6, 6) as follows:

Source         l       b    A     N      L     Duration   Identif.
KGX 345-6    34504   - 6o9  1.5   5   2.5-9.4  5s-15s     NGC 6388
KGX 349-11   348.1   -11.4  8     3   0.5-2    5 -50      NGC 6541

A = area of 90-percent confidence box (square degrees); N = number
of flares; L = maximum luminosity (10**40 erg/s).  Observations were
in the 40-70 and 70-190 keV ranges.


POSSIBLE INFRARED COUNTERPART OF MXB1730-335
     D. E. Kleinmann, Center for Astrophvsics, reports that
multiaperture JHKL observations with the 130-cm telescope at Kitt Peak
National Observatory show a bright, extended object coincident (to
within ~ 5") with the center of Liller's star cluster (IAUC 2936;
see also IAUC 2954).  The source has a full width of at least 66".
For beam sizes between 12" and 66" the JHKL colors remain essentially
constant, except that K (66") = +5.5 and K (12") = +8.1.
This extended infrared source could be a compact globular cluster
at a distance of 10 to 30 kpc.


1976 June 7                    (2959)              Brian G. Marsden

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