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IAUC 6273: 1993J; AX J2315-592; C/1995 O1

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                                                  Circular No. 6273
Central Bureau for Astronomical Telegrams
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
Phone 617-495-7244/7440/7444 (for emergency use only)

     M. J. Montes, N. E. Kassim, and K. W. Weiler, Naval Research
Laboratory; R. A. Sramek, National Radio Astronomy Observatory; and
S. D. Van Dyk, University of California at Berkeley, report that
new observations of SN 1993J made with the Very Large Array (VLA)
in "B" configuration show that, through application of wide-field
mapping algorithms, radio emission from the supernova is now
detectable at wavelength 90 cm (0.330 GHz).  On Oct. 6, the source
had reached a level of 18.6 +/- 2.9 mJy.  SN 1993J remains strong
and optically thin at higher frequencies, with flux densities on
that date decreasing from 99.9 mJy at 1.4 GHz to 10.5 mJy at 22.5
GHz (spectral index of -0.83).  Results at earlier times are given
by Van Dyk et al. (1995, Ap.J. 432, L115).  Monitoring with the VLA
in all bands continues.

AX J2315-592
     P. McGee, Department of Physics and Mathematical Physics,
University of Adelaide, writes: "Differential CCD photometry of the
optical counterpart of AX J2315-592 was undertaken at Woomera on
Nov. 20-22 with a clear-filtered CCD.  Exposures were 75 s long at
120-s intervals.  Light curves covering somewhat over four cycles
show a clear period as per IAUC 6260 and 6261 and exhibit different
peak-trough amplitudes, as follows:  Nov. 20.5035 UT (start of 1.5-
hr run), amplitude 0.9 mag; 21.5378 (start of 2-hr run), 1.1 mag;
22.5041 (start of 3.7-hr run), 0.7 mag.  Standard deviations for
the comparison/check-star data were in the range 0.037-0.058 mag.
It is expected that similar observations will be made over the
period Dec. 12-22."

     Corrigendum.  On IAUC 6229, line 4, for  K, 5.6 x 10E-15  read
K, 5.6 x 10E-16
     Total magnitude estimates (cf. IAUC 6252):  Oct. 28.11 UT,
10.0 (C. S. Morris, southern CA, 0.26-m reflector); Nov. 11.06,
10.1 (A. Hale, Cloudcroft, NM, 0.41-m reflector); 14.06, 10.0
(Hale); 17.08, 9.6 (Morris); 19.08, 9.7 (Morris); 21.41, 10.0 (P.
Camilleri, Cobram, Victoria, Australia, 0.20-m reflector); 24.07,
9.8: (Hale, 0.2-m reflector).

1995 December 12               (6273)            Daniel W. E. Green

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