[IAUC] CBET 2712: 20110504 : SUPERNOVA 2011cc IN IC 4612 = PSN J16334944+3915487

[quai en eps.harvard.edu]

                                                  Electronic Telegram No. 2712
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
CBAT Director:  Daniel W. E. Green; Hoffman Lab 209; Harvard University;
 20 Oxford St.; Cambridge, MA  02138; U.S.A.
e-mail:  cbatiau en eps.harvard.edu (alternate cbat en iau.org)
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network


SUPERNOVA 2011cc IN IC 4612 = PSN J16334944+3915487
     Further to CBET 2699, M. Mason, S. B. Cenko, W. Li, and A. V. Filippenko
report the LOSS discovery of an apparent supernova on unfiltered KAIT images:

 SN       2011 UT        R.A. (2000.0) Decl.      Mag.      Offset
 2011cc   Mar. 17.52   16 33 49.44  +39 15 48.7   17.7    2".3 W, 0".9 N

This object was designated PSN J16334944+3915487 when posted at the Central
Bureau's TOCP webpage and is here designated SN 2011cc based on the
spectroscopic report below.  Additional KAIT magnitudes for 2011cc:  2010
Sept. 13.16 UT, [19.1 (KAIT); 2011 Apr. 17.51, 17.6 (KAIT).  Joseph
Brimacombe, Cairns, Australia, reports this a red-filtered image taken
remotely with a 51-cm RCOS telescope at the New Mexico Skies Observatory
near Mayhill, NM, U.S.A., on Apr. 18.471 shows 2011cc at position end
figures 49s.48, 47".8, noting that the variable was too close to the
galaxy core to get easy photometry.

     A. V. Filippenko and J. M. Silverman, University of California,
Berkeley, report that inspection of a CCD spectrum (range 340-1000
nm), obtained by A. J. Barth (University of California, Irvine) on May
2 UT with the 3-m Shane reflector (+ Kast) at Lick Observatory, shows
that PSN J16334944+3915487 = SN 2011cc is a type-IIn supernova.  Although the
spectrum is somewhat contaminated by host-galaxy light, H-alpha is seen in
emission with an unresolved (FWHM about 470 km/s) component (centered at a
recession velocity of 9460 km/s), an intermediate (FWHM about 2600 km/s)
component, and a broad (FWHM about 13600 km/s) component.  Furthermore,
strong Ca II triplet emission is seen along with possible broad He I
emission and a narrow He I 587.6-nm component (possibly from a He-enhanced
circumstellar medium), as well as a relatively blue continuum.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2011 CBAT
2011 May 4                       (CBET 2712)              Daniel W. E. Green