[IAUC] CBET 3835: 20140322 : SUPERNOVA 2014ah IN PGC 37426 = PSN J11553083+1155263

Sab Mar 22 10:42:16 ART 2014

                                                  Electronic Telegram No. 3835
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 2014ah IN PGC 37426 = PSN J11553083+1155263
     Simone Leonini, Siena, Italy, reports the discovery of an apparent
supernova (mag about 15.4) by himself with M. Conti, G. Guerrini, P. Rosi, and
L. M. Tinjaca Ramirez on two unfiltered CCD images (limiting mag about 18.6)
taken on Mar. 12.002 UT in the course of the Italian Supernovae Search Project
using a 0.53-m f/8.7 Ritchey-Chretien telescope (+ Apogee Alta U47 camera) at
their Montarrenti Observatory.  The new object is located at R.A. =
11h55m30s.83 +/- 0".2, Decl. = +11d55'26".3 +/- 0".2 (equinox 2000.0), which
is 4" east of the nucleus of the galaxy PGC 37426 = MCG +02-30-44.  No stellar
source is visible at this position on their previous image taken on Mar. 3
(limiting mag about 19.0).  The discovery image is posted at website URL
http://www.astrofilisenesi.it/public/Sne/Uploads/PSN_PGC037426.jpg.  The
variable was designated PSN J11553083+1155263 when it was posted at the
Central Bureau's TOCP webpage and is here designated SN 2014ah based on the
spectroscopic confirmation reported below.  Additional CCD magnitudes for
2014ah:  Mar. 12.993, 16.3 (Gianluca Masi, Francesca Nocentini, and Patrick
Schmeer; remotely using a 43-cm telescope near Ceccano, Italy; position end
figures 30s.87, 26".3); 12.995, V = 16.5 (Massimiliano Martignoni, Magnago,
Italy; 0.25-m Schmidt-Cassegrain reflector; position end figures 30s.85,
24".9); 14.120, 17.1 (Federica Luppi and Luca Buzzi, Varese, Italy; position
end figures 30s.84, 26".1; reference stars from CMC-14 catalogue; image
posted at URL http://www.astrogeo.va.it/pub/TOCP/PSN_P37426.jpg); 15.084, 16.1
(S. Foglia and G. Galli, Pogliano Milanese, Italy; 0.28-m f/6.8 reflector +
ST8XME camera; position end figures 30s.89, 26".3; UCAC-4 reference stars).

     P. Ochner, S. Benetti, L. Tomasella, E. Cappellaro, A. Pastorello, N.
Elias-Rosa, and M. Turatto, Osservatorio Astronomico di Padova, Istituto
Nazionale di Astrofisica, report that an optical spectrogram (range 335-790
nm; resolution 0.9 nm) of PSN J11553083+1155263 = SN 2014ah, obtained on Mar.
10.98 UT with the Asiago 1.22-m Galileo Telescope (+ Boller & Chivens
spectrograph), shows it to be a type-Ia supernova.  Adopting for the host
galaxy (PGC 37426 = MCG +02-30-44 = CGCG 68-91) a radial velocity of 6303
km/s (SDSS Data Release 4, via NED), a good match is found with the spectrum
of SN 2003du (Stanishev et al. 2007, A.Ap. 469, 645) about a week before
maximum light.  The expansion velocity, deduced from the Si II 635.5-nm
absorption, is about 10400 km/s.  The Asiago classification spectra are
posted at website URL http://sngroup.oapd.inaf.it; classification was made
via GELATO (Harutyunyan et al. 2008, A.Ap. 488, 383) and SNID (Blondin and
Tonry 2007, Ap.J. 666, 1024).


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

                         (C) Copyright 2014 CBAT
2014 March 22                    (CBET 3835)              Daniel W. E. Green