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IAUC 8157: 2003gf; 2002ic; N IN M31

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                                                  Circular No. 8157
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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SUPERNOVA 2003gf IN MCG -04-52-26
     M. Hamuy, Carnegie Observatories; and J. Maza, University of
Chile, report that a spectrum (range 380-930 nm) of SN 2003gf (cf.
IAUC 8156), obtained on June 25.31 UT with the Dupont 2.5-m
telescope (+ WFCCD) at Las Campanas, bears resemblance to those of
the type-Ic SN 1987M obtained 11-29 days after maximum light
(Filippenko 1997, ARAA 35, 309).  Superimposed narrow emission
H_alpha emission from the host galaxy yields a recession velocity
of 2520 km/s.

     E. Berger and A. M. Soderberg, California Institute of
Technology; and D. A. Frail, National Radio Astronomy Observatory,
report an upper limit of 0.1 mJy from an observation of SN 2002ic
(IAUC 8019) with the Very Large Array (VLA) at 4.86 GHz on June
16.60 UT; this result is consistent with the dense circumstellar
material inferred from H_alpha (IAUC 8151).
     Further to IAUC 8153, C. J. Stockdale, R. A. Sramek, K. W.
Weiler, S. D. Van Dyk, and N. Panagia, report a search with the VLA
for radio emission from the type-Ia supernova 2002ic (IAUC 8019,
8028, 8151), possibly the first type-Ia event found showing
significant interaction between the ejecta and a dense
circumstellar medium:  "Hamuy et al. (2003,
http://xxx.lanl.gov/abs/astro-ph/?0306270), suggest a similarity to
type-IIn supernovae.  Our 3-sigma upper limit of 1.28 mJy was
obtained at 22.485 GHz (wavelength 1.3 cm) on June 17.79 UT
(supernova age approximately 216 days) in 'A'-configuration at the
optical position (IAUC 8019).  Comparison with the radio emission
from the type-IIn supernova 1988Z (and the very similar SN 1986J)
indicates that SN 1988Z, at the distance of SN 2002ic, would have
yielded a 5-sigma detection at this frequency and epoch (cf.
Williams et al. 2002, Ap.J. 581, 396).  If SN 2002ic were indeed
similar to a type-IIn supernova, lower frequencies would be
optically thick at this epoch of observation, as is implied by the
upper limit obtained by Berger et al. (see above) at 4.86 GHz on
the same date.  Additional observations are planned."

     K. Hornoch, Lelekovice, Czech Republic, reports the discovery
of an apparent nova located at R.A. = 0h43m36s.17, Decl. =
+41o16'39".4 (equinox 2000.0), which is 583" east and 30" north of
the center of M31.  Approximate R-band magnitudes:  June 21.021 UT,
[18.3; 25.01, 17.3; 26.02, 16.4.

                      (C) Copyright 2003 CBAT
2003 June 26                   (8157)            Daniel W. E. Green

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