Electronic Telegram No. 426

  Central Bureau for Astronomical Telegrams
  INTERNATIONAL ASTRONOMICAL UNION
  M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, 
  U.S.A.
  IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
  CBAT@CFA.HARVARD.EDU (science)
  URL http://cfa-www.harvard.edu/iau/cbat.html


  SUPERNOVA 2006au IN UGC 11057
      O. Trondal, Oslo, Norway; P. Luckas, Perth, W. Australia; and
  M. Schwartz, Patagonia, AZ, report the discovery of an apparent
  supernova on unfiltered CCD frames taken in the course of the
  Tenagra Observatory Supernova Search with the 0.35-m Tenagra
  telescope in Oslo on Mar. 7.20 (at mag 17.2) and 10.65 UT (mag 17.4).
  SN 2006au is located at R.A. = 17h57m13s.56, Decl. = +12o11'03".2
  (equinox 2000.0), which is 17".0 west and 18".2 north of the center
  of UGC 11057 (which has position end figures 14s.72, 10'45".0).
  Nothing was visible at the position of 2006au on an image taken
  by Schwartz on 2004 Sept. 17.15 (limiting magnitude about 19.5) using
  the 0.81-m Tenagra telescope at Patagonia.


  NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
       superseded by text appearing later in the printed IAU Circulars.

                        (C) Copyright 2006 CBAT
  2006 March 10               (CBET 426)            Daniel W. E. Green
  




                    Electronic Telegram No. 427

 SUPERNOVA 2006au IN UGC 11057
     The "Nearby Supernova Factory" collaboration (N. Blanc, Y. Copin,
 E. Gangler, and G. Smadja, Institut de Physique Nucleaire de Lyon; P.
 Antilogus, S. Gilles, R. Pain, and R. Pereira, Laboratoire de Physique
 Nucleaire et de Haute Energies de Paris; G. Aldering, S. Bailey, S.
 Bongard, D. Kocevski, S. Loken, P. Nugent, S. Perlmutter, R. Scalzo,
 R. C. Thomas, L. Wang, and B. A. Weaver, Lawrence Berkeley National
 Laboratory; E. Pecontal and G. Rigaudier, Centre de Recherche
 Astronomique de Lyon; R. Kessler, Kavli Institute for Cosmological
 Physics, Chicago; and C. Baltay, D. Rabinowitz, and A. Bauer, Yale
 University) reports that a spectrum (range 320-1000 nm) of SN 2006au
 (cf. CBET 426), obtained under bad seeing conditions on Mar. 13.6 UT
 with the University of Hawaii 2.2-m telescope (+ Supernova Integral
 Field Spectrograph), shows it to be a type-II supernova at an approximate
 redshift of z = 0.01, consistent with that of the host (UGC 11057, z =
 0.009580; Theureau et al. 1998, A.Ap. Suppl. 130, 333, via NED).
 The spectrum shows a well-developed H-alpha P-Cyg profile.


 NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
      superseded by text appearing later in the printed IAU Circulars.

                      (C) Copyright 2006 CBAT
 2006 March 12               (CBET 427)            Daniel W. E. Green






                          Circular No. 8687


  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).
  
  
  RS OPHIUCHI
      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