SN 2011fw (A.R. 03 20 54.24, Dec. +37 52 05.3) scoperta il 23 settembre 2011 nella galassia PGC 12552 (offset 8E 3N), magnitudine 17.2, tipo Ia.
SN scoperta da F. Ciabattari ed E. Mazzoni con il telescopio Newton da 50cm dell'Osservatorio di Monte Agliale (Lucca).
PGC 12552 è una galassia distante 70 Mpc, magnitudine 15.4.
Electronic Telegram No. 2829
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 2011fw IN MCG +06-8-15 = PSN J03205424+3752053
F. Ciabattari and E. Mazzoni, Borgo a Mozzano, Italy, report the discovery
of a possible supernova (mag 17.2) on unfiltered CCD images (limiting mag 18.5)
obtained on Sept. 23.04 and 23.92 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. = 3h20m54s.24, Decl. = +37d52'05".3 (equinox 2000.0; astrometry with
respect to UCAC-2 stars), which is 8" east and 3" north of the center of the
galaxy MCG +06-8-15. Nothing is visible at this position on digitized plates
of the Palomar Sky Survey from 1989 Sept. 29 (F plate; limiting magnitude 20.3)
and 1996 Oct. 18 (J plate; limiting magnitude 20.3). The variable was
designated PSN J03205424+3752053 when it was posted at the Central Bureau's
TOCP webpage and is here designated SN 2011fw based on the spectroscopic report
below. Joseph Brimacombe, Cairns, Australia, reports unfiltered CCD magnitude
18.0 and position end figures 54s.18, 04".7 for 2011fw from an image taken on
Sept. 24.394. Brimacombe's image is posted at the following website URL:
http://www.flickr.com/photos/43846774@N02/6179668611/.
L. Tomasella, S. Valenti, P. Ochner, S. Benetti, and E. Cappellaro,
Osservatorio Astronomico di Padova, Istituto Nazionale di Astrofisica; and A.
Pastorello, Dipartimento di Astronomia, Universita di Padova, on behalf of a
larger collaboration, report that a spectrogram (range 360-810 nm; resolution
2.2 nm) of PSN J03205424+3752053 = SN 2011fw, obtained on Sept. 23.99 UT,
suggests that it is a type-Ia supernova observed about six weeks past B-band
maximum.
NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
superseded by text appearing later in the printed IAU Circulars.
(C) Copyright 2011 CBAT
2011 September 25 (CBET 2829) Daniel W. E. Green