SN 2013ey in PGC65806 - 11 agosto 2013

Stampa

SN 2013ey (A.R., 20 58 03.73 Dec. +11 03 10.8), scoperta il 11 agosto 2013 nella galassia pgc 65806 (offset 2W 3S), magnitudine 16.3, tipo: Ia (ATEL 5278)

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

Electronic Telegram No. 3636
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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SUPERNOVA 2013ey IN PGC 65806 = PSN J20580373+1103108
F. Ciabattari, E. Mazzoni, and M. Rossi, Borgo a Mozzano, Italy, report
the discovery of an apparent supernova (mag 16.3) on unfiltered CCD images
(limiting magnitude 19.5) obtained on Aug. 11.98 and 13.82 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. = 20h58m03s.73, Decl. = +11d03'10".8
(equinox 2000.0; astrometry with respect to UCAC-2 stars), which is 2" west
and 3" south of the center of the galaxy PGC 65806. Nothing is visible at
this position on the digitized plates of the Palomar Sky Survey to limiting
magnitude 20.3 from 1987 Sept. 18 (F plate) and 1990 June 25 (J plate). The
variable was designated PSN J20580373+1103108 when it was posted at the
Central Bureau's TOCP webpage and is here designated SN 2013ey based on the
spectroscopic confirmation reported below. Additional CCD magnitudes for
2013ey: Aug. 3, [19.5 (Ciabattari); 14.505, 15.7 (Joseph Brimacombe, Cairns,
Australia; 43-cm CDK telescope + STL6K camera + infrared filter; bandpass >
700 nm; position end figures 03s.73, 11".0; image posted at website URL
http://www.flickr.com/photos/43846774@N02/9519273813/); 15.965, 16.7 (S.
Foglia and G. Galli, Pogliano Milanese, Italy; 0.28-m f/6.8 
Schmidt-Cassegrain
reflector + ST8XME camera; position end figures 03s.71, 10".5; UCAC-4
reference stars); 20.843, V = 15.9 (Massimiliano Martignoni, Magnago, Italy;
25-cm f/10 Schmidt-Cassegrain reflector; position end figures 03s.74, 
10".2);
21.858, V = 16.1 (Martignoni).

S. Valenti, Las Cumbres Observatory Global Telescope (LCOGT) and
University of California at Santa Barbara (UCSB); D. Sand, Texas Tech
University; D. A. Howell and M. L. Graham, LCOGT and UCSB; and J. T. 
Parrent,
LCOGT and Dartmouth College, report that a spectrogram (range 320-1000 nm) 
of
PSN J20580373+1103108 = SN 2013ey was obtained robotically on Aug. 14.42 UT
with the FLOYDS spectrograph at "Faulkes Telescope North" at Haleakala.
The
spectrum shows 2013ey to be a type-Ia supernova roughly one week before
maximum light and is consistent with the host-galaxy (CGCG 425-26) redshift 
of
z = 0.027. Classification was performed via supernova spectrum cross-
correlation using 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 22 (CBET 3636) Daniel W. E. Green