Electronic Telegram No. 3467
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@eps.harvard.edu (alternate cbat@iau.org)
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network


SUPERNOVA 2011ke
     [Editor's note:  the text below replaces that on CBET 3460.]
     A. A. Mahabal, A. J. Drake, S. G. Djorgovski, M. J. Graham, and R.
Williams, California Institute of Technology; J. L. Prieto, Princeton
University; M. Catelan, Pontificia Universidad Catolica de Chile; and S. M.
Larson and E. Christensen, Lunar and Planetary Laboratory, University of
Arizona, report the Catalina Real-time Transient Survey discovery of an
apparent supernova in unfiltered Catalina Sky Survey (CSS) images:

    SN       2011 UT       R.A. (2000.0) Decl.        Mag.
    2011ke   Apr. 6.35   13 50 57.79  +26 16 42.2     18.4

Further magnitudes for 2011ke:  2011 Mar. 27.29 UT, [20.0 (CSS); Apr. 14.24,
18.0 (CSS); Apr. 25.30, 17.7 (CSS); May 12.33, 17.8 (CSS); May 14.22, g =
17.9, r = 17.9, i = 18.0, z = 18.3 (Palomar 1.5-m reflector); May 27.33,
18.5 (CSS); June 12.31, 19.3 (CSS).
     A spectrogram confirming the supernova was taken with the Palomar 5-m
reflector (+ DBSP) on 2011 May 8 UT.  The spectrum shows a blue continuum
with the clear presence of emission from the host galaxy in [O II], [O III],
H_beta, and H_alpha.  The host galaxy is also clearly seen in images taken
via the Canada-France-Hawaii Telescope and the Sloan Digital Sky Survey.
Based on the redshift of z = 0.143 (derived from the host-galaxy emission
lines), the host galaxy has absolute r-band magnitude -18.4.  The supernova
is clearly seen continuing to rise from the detection brightness to
absolute V-band magnitude -21.5 on 2011 Apr. 25.  The spectrum itself
resembles the early spectrum of the well-studied luminous peculiar type-Ic
supernova 2010gx (cf. CBET 2413; Mahabal et al. 2010, via website URL
http://www.astronomerstelegram.org/?read=2490; Pastorello 2010, Ap.J. 724,
L16).

     C. Inserra, S. J. Smartt, M. Fraser, D. Young, K. Smith, D. Wright, R.
Kotak, M. McCrum, L. Magill, and T.-W. Chen, Queen's University, Belfast; A.
Pastorello and S. Benetti, Osservatorio Astronomico di Padova, Istituto
Nazionale di Astrofisica; S. Valenti, Las Cumbres Observatory Global Telescope
and University of California at Santa Barbara; F. Bresolin, R. Kudritzki, J.
Tonry, E. Magnier, M. Huber, K. Chambers, N. Kaiser, J. Morgan, W. Burgett, J.
Heasley, W. Sweeney, C. Waters, and H. Flewelling, University of Hawaii; C.
Stubbs, Harvard University; P. A. Price, Princeton University; J. Sollerman,
F. Taddia, and M. Ergon, Oscar Klein Centre, Stockholm; G. Leloudas, Dark
Cosmology Centre, Copenhagen; and S. Taubenberger, Max-Planck-Institut fuer
Astrophysik, Garching, report that they obtained a spectrogram of 2011ke on
2011 May 21 UT with the Telescopio Nazionale Galileo (+ DOLORES).  The
spectrum shows the clear presence of emission from the host galaxy of [O II],
[O III], H-beta, and H-alpha.  (The host galaxy is also clearly seen in images
obtained via the Canada-France-Hawaii Telescope and the Sloan Digital Sky
Survey.)  A good match is obtained with the spectrum of SN 2010gx (cf. CBET
2413), a super-luminous type-Ic supernova, at a week after maximum light.


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

                         (C) Copyright 2013 CBAT
2013 April 13                    (CBET 3467)              Daniel W. E. Green