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SN 2013ff in NGC2748 - 31 agosto 2013

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SN 2013ff (A.R., 09 13 38.88 Dec. +76 28 10.8), scoperta il 31 agosto 2013 nella galassia ngc 2748 (offset 18W 20S), magnitudine 16.0, tipo: Ic

SN individuata da Raffaele Belligoli e Flavio Castellanii con il telescopio Newton da 40cm dell'Osservatorio di Monte Baldo (Verona).

Electronic Telegram No. 3647 - 3656
Central Bureau for Astronomical Telegrams
CBAT Director: Daniel W. E. Green; Hoffman Lab 209; Harvard University;
20 Oxford St.; Cambridge, MA 02138; U.S.A.
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URL http://www.cbat.eps.harvard.edu/index.html
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SUPERNOVA 2013ff IN NGC 2748 = PSN J09133888+7628108
Raffaele Belligoli and Flavio Castellani report the discovery of an
apparent supernova (mag 16.0) on two unfiltered CCD images taken with a 
reflector at Ferrara di Monte Baldo, Verona, Italy, on Aug. 31.94 and 31.94
UT. The new object is located at R.A. = 9h13m38s.88, Decl. = +76d28'10".8
(equinox 2000.0), which is 19" west and 21" south of the center of NGC
The discovery and reference images were posted at the following website URL:
http://www.flickr.com/photos/27458003@N05/9645256677/. The variable was
designated PSN J09133888+7628108 when it was posted at the Central Bureau's
TOCP webpage and is here designated SN 2013ff based on the spectroscopic
confirmation reported below. Additional CCD magnitudes for 2013ff: Sept.
1.804, 15.9 (Giancarlo Cortini, Predappio, Italy; independent discovery;
position end figures 38s.82, 10".7; offset 19" west, 21" north; no
information provided); 2.168, 16.1 (J. Brimacombe, Cairns, Australia; 
with a 51-cm telescope + luminance filter located at the New Mexico Skies
observatory near Mayhill, NM, U.S.A.; position end figures 39s.01, 10".5;
image posted at URL http://www.flickr.com/photos/43846774@N02/9657496645/);
4.054, B = 16.33, V = 15.52, B-V = +0.81 (Belligoli and Castellani); 4.146,
15.2 (Federica Luppi and Luca Buzzi, Varese, Italy, 0.36-m f/7.1 reflector;
position end figures 38s.86, 10".4; reference stars from PPMXL catalogue;
image posted at URL http://www.astrogeo.va.it/pub/TOCP/PSN_N2748.jpg);
6.959, B = 16.28, V = 15.43, B-V = +0.84 (Belligoli and Castellani).

S. Zaggia, M. Barbieri, A. Silvestri, V. Ronzani, S. Benetti, A.
Pastorello, E. Cappellaro, L. Tomasella, P. Ochner, and M. Turatto,
Osservatorio Astronomico di Padova, Istituto Nazionale di Astrofisica; and 
Valenti, Las Cumbres Observatory Global Telescope and University of 
at Santa Barbara, report that an optical spectrogram (range 340-820 nm;
resolution 1.3 nm) of PSN J09133888+7628108 = SN 2013ff, obtained on Sept.
2.95 UT with the Asiago 1.82-m Copernico Telescope (+ AFOSC), shows it to be 
type-Ic supernova. Adopting for the host galaxy (NGC 2748) a recessional
velocity of 1476 km/s (Kamphuis et al. 1996, A.Ap. Supple. 116, 15; via 
a best fit is found with type-Ic supernovae around maximum light. The Asiago
classification spectra are posted at website URL 
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 September 9 (CBET 3647) Daniel W. E. Green