SN 2013ep in PGC70151 - 29 luglio 2013

Stampa

SN 2013ep (A.R., 22 58 30.35 Dec. +40 25 44.5), scoperta il 29 luglio 2013 nella galassia pgc 70151 (offset 10E 4S), magnitudine 18.4, tipo: IIb (Asiago spectrum)

PSN individuata da Ciabattari con il telescopio Newton da 50cm dell'Osservatorio di Monte Agliale (Lucca).

Electronic Telegram No. 3615
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.
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Prepared using the Tamkin Foundation Computer Network

SUPERNOVA 2013ep IN PGC 70151 = PSN J22583035+4025445
F. Ciabattari, Borgo a Mozzano, Italy, reports the discovery of an
apparent supernova (mag 18.4) on unfiltered CCD images (limiting mag 19.5)
obtained on July 29.04, July 31.08, and Aug. 1.1 UT with a 0.5-m Newtonian
telescope in the course of the Italian Supernovae Search Project. The new
object is located at R.A. = 22h58m30s.35, Decl. = +40d25'44".5 (equinox
2000.0; astrometry with respect to UCAC-2 stars), which is 10" east and 4"
south of the center of the galaxy PGC 70151. Nothing is visible at this
position on digitized plates of the Palomar Sky Survey from 1989 Sept. 30
(F plate; limiting magnitude 20.3) and 1992 Sept. 3 (J plate; limiting mag
20.3). The variable was designated PSN J22583035+4025445 when it was posted
at the Central Bureau's TOCP webpage and is here designated SN 2013ep based
on the spectroscopic confirmation reported below.

L. Tomasella, S. Benetti, E. Cappellaro, P. Ochner, A. Pastorello, and
M. Turatto, Osservatorio Astronomico di Padova, Istituto Nazionale di
Astrofisica, report that an optical spectrogram (range 340-820 nm; 
resolution
1.3 nm) of PSN J22583035+4025445 = SN 2013ep, obtained on Aug. 2.02 UT with
the Asiago 1.82-m Copernico Telescope (+ AFOSC), shows that this is a young
core-collapse supernova. Adopting for the host galaxy, PGC 70151, a redshift
z about 0.016888 (Huchra et al. 1999, Ap.J. Suppl. 121, 287; via NED), a 
best
fit was found with the type-IIb supernova 2008ax (Pastorello et al. 2008,
MNRAS 389, 955) at ten days after explosion. The Asiago classification
spectra are posted at website URL http://graspa.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superseded by text appearing later in the printed IAU Circulars.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 2013 CBAT
2013 August 3 (CBET 3615) Daniel W. E. Green