Electronic Telegram No. 4081
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 2015F IN NGC 2442 = PSN J07361576-6930230
     L. A. G. Monard, Calitzdorp, Western Cape, South Africa, reports his
discovery of an apparent supernova (mag 16.8) on several unfiltered CCD
images taken at his Klein Karoo Observatory with a 35-cm RCX400 telescope (+
SBIG ST8-XME camera) on Mar. 9.789 UT.  The new object is located at R.A. =
7 36 15.76, Decl. = -69 30 23.0 (equinox 2000.0), which is 40" west and 84"
north of the center of the nearby type-Sbc galaxy NGC 2442.  The variable was
designated PSN J07361576-6930230 when it was posted at the Central Bureau's
TOCP webpage and is here designated SN 2015F based on the spectroscopic
confirmation reported below.  Additional magnitudes for 2015F by Monard:
Feb. 23.896, [19.5; Mar. 11.744, 15.4; 11.944, 15.3; 14.763, 14.2; 15.747,
13.8; 17.775, 13.4; 18.768, 13.2; 19.752, 13.1.

     M. Fraser, Institute of Astronomy; M. Smith, R. Firth, G. Dimitriadis, C.
Frohmaier, R. Cartier, S. Prajs, and M. Sullivan, Southampton University; J.
Anderson and K. Maguire, European Southern Observatory; C. Inserra, S. J.
Smartt, K. W. Smith, and D. Young, Queen's University, Belfast; S. Valenti,
Las Cumbres Observatory Global Telescope; and O. Yaron and I. Manulis,
Weizmann Institute for Science -- on behalf of the PESSTO collaboration (cf.
website URL http://www.astronomerstelegram.org/?read=6739) -- report that an
optical spectrogram (range 369-932 nm) of PSN J07361576-6930230 = SN 2015F,
obtained on Mar. 11.006 UT with the 3.6-m New Technology Telescope (+ EFOSC2
Grism 13; range 398.5-931.5 nm; 1.8-nm resolution) at La Silla, shows it to
be a type-Ia supernova.  Adopting a recession velocity of 1467 km/s for NGC
2442 (after Koribalski et al. 2004, A.J. 128, 16; via NED), the best fit to
the spectrum found via the SNID (Blondin and Tonry 2007, Ap.J. 666, 1024)
and Superfit software (Howell et al. 2005, Ap.J. 634, 1190) is to the
spectrum of SN 2002bo at roughly twelve days before maximum light.
Classification spectra can be obtained at website URL http://www.pessto.org
(via WISeREP).


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2015 CBAT
2015 March 26                    (CBET 4081)              Daniel W. E. Green