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IAUC 8687: 2006at, 2006au; RS Oph

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IAUC number

                                                  Circular No. 8687
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)

SUPERNOVAE 2006at AND 2006au
     Two supernovae have been discovered on unfiltered CCD survey
images:  2006at by B. Dintinjana and H. Mikuz, Crni Vrh Observatory,
on four frame taken with a 0.60-m f/3.3 Cichocki reflector in the
course of their 'Comet and Asteroid Search Program' (PIKA); and
2006au by O. Trondal, P. Luckas, and M. Schwartz with the 0.35-m
Tenagra telescope in Oslo (cf. IAUC 8674).

SN      2006 UT      R.A.  (2000.0)  Decl.    Mag.     Offset
2006at  Mar. 8.055  13 12 41.11  +63 16 45.4  17.1  8".0 E, 10".5 N
2006au  Mar. 7.20   17 57 13.56  +12 11 03.2  17.2  17".0 W, 18".2 N

H. Yamaoka, Kyushu University; and H. Naito and N. Tokimasa, Nishi-
Harima Astronomical Observatory, report that a rather noisy, low-
resolution spectrum (range 420-690 nm; R = 1000 at 500 nm) taken of
2006at on Mar. 8.8 UT with the 2.0-m NAYUTA telescope shows a
rather featureless blue (blackbody-like) continuum with possible
very broad features (either absorption valleys or emission troughs,
which suggests that it may be a very young supernova.  Additional
approximate magnitudes for 2006at:  1993 Mar. 19 UT, [19.6 (Digital
Sky Survey, blue); 1997 Apr. 13, [20 (DSS, red); 2006 Feb. 12.074,
[18.5 (PIKA R-band); Mar. 8.8, 16.7 (Yamaoka et al., slit-viewer
unfiltered image).  The host galaxy of 2006at is hard to identify
on the DSS image because it is very diffuse; a SDSS color-composite
image taken in 2001 also shows no point source down to mag about 21.
Additional approximate magnitudes for 2006au in UGC 11057:  2004
Sept. 17.15, [19.5; 2006 Mar. 10.65 UT, 17.4.  The "Nearby
Supernova Factory" collaboration reports that SN 2006au is a
type-II supernova (details on CBET 427).

     G. C. Anupama, Indian Institute of Astrophysics, Bangalore;
and N. G. Kantharia, National Center for Radio Astrophysics, Pune,
report the low-frequency radio detection of the current outburst of
the recurrent nova RS Oph (cf. IAUC 8671) using the Giant Metrewave
Radio Telescope (GMRT), at the following flux densities:  Feb.
24.12 UT, 49.5 +/- 0.5 mJy at 23.3 cm; Mar. 2.04, 55.4 +/- 2.8 mJy
at 28.3 cm, 50.0 +/- 0.8 mJy at 23.3 cm, and 56.8 +/- 0.3 mJy at
21.6 cm; Mar. 5.09, 48.4 +/- 2.0 mJy at 49.2 cm.  This is the first
detection of the nova at wavelengths longer than 21 cm.  Further
GMRT observations at low frequencies are underway.

                      (C) Copyright 2006 CBAT
2006 March 13                  (8687)            Daniel W. E. Green

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