[IAUC] CBET 1751: 20090403 : SUPERNOVA 2009bb IN NGC 3278

[IAUC mailing list]

                                                  Electronic Telegram No. 1751
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS en CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT en CFA.HARVARD.EDU (science)
URL http://www.cfa.harvard.edu/iau/cbat.html


SUPERNOVA 2009bb IN NGC 3278
     M. Stritzinger, M. M. Philips, N. Morrell, and F. Salgado, Las Campanas
Observatory (LCO); and G. Folatelli, Millennium Center for Supernova Science,
on behalf of the Carnegie Supernova Project, report that they have obtained
spectra (range 380-920 nm) of 2009bb (cf. CBET 1731) on Mar. 28.1, Mar. 29.1,
and Apr. 3.1 UT with the LCO's du Pont 2.5-m telescope (+ WFCCD).  The
spectrum consists of shallow features that are characteristic of a young,
broad-line type-Ic supernova.  The spectra are reminiscent of the earliest
observations of SN 1997ef (Garnavich et al. 1997, IAUC 6778).  Shallow
absorption features at the locations of the Fe II multiplet 42 (492.4-516.9
nm), Na I D, Si II (rest 635 nm), O I (rest 777.4 nm), and the Ca II near-
infrared triplet are discernable and have grown slightly in strength.
V-band magnitudes from LCO for 2009bb:  Mar. 24, 16.71; 25, 16.47; 27, 16.07.
     E. Prosperi, Larciano, Italy, reports the following unfiltered CCD
magnitude for 2009bb:  Mar. 30.541 UT, 15.4.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2009 CBAT
2009 April 3                     (CBET 1751)              Daniel W. E. Green