[IAUC] CBET 2908: 20111122 : SUPERNOVA 2011hy IN UGC 3131 = PSN J04450526+7247025

[quai en eps.harvard.edu]

                                                  Electronic Telegram No. 2908
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 2011hy IN UGC 3131 = PSN J04450526+7247025
     Giancarlo Cortini, Predappio, Italy, reports his discovery of an apparent
supernova (mag 17.3) on several CCD images (limiting mag 19.0) taken with a
Celestron 14 telescope on Nov. 16.78 UT.  The new object is located at R.A. =
4h45m05s.26, Decl. = +72d47'02".6 (equinox 2000.0), which is 4" west and 1"
south of the center of UGC 3131; he notes that nothing is visible at this
position on Palomar Sky Survey red or blue plates (no limiting magnitudes or
dates provided) or on his earlier images to limiting mag 19.0 (no dates
provided).  The variable was designated PSN J04450526+7247025 when it was
posted at the Central Bureau's TOCP webpage and is here designated SN 2011hy
based on the spectroscopic confirmation reported below.  Additional
unfiltered CCD magnitudes for 2011hy:  Nov. 16.959, 17.9 (Federica Luppi and
Luca Buzzi, Varese, Italy; 0.38-m f/6.8 reflector; position end figures
05s.08, 01".7; reference stars from the NOMAD catalogue; image posted at
website URL http://www.astrogeo.va.it/pub/TOCP/PSN_U3131.jpg); 17.735, 16.5
(Nick James, Chelmsford, Essex, England; Celestron 11 telescope + ST9-XE
camera; position end figures 05s.14, 01".4; UCAC-3 reference stars).

      S. Valenti, A. Pastorello, S. Benetti, L. Tomasella, F. Bufano, and P.
Ochner, Istituto Nazionale di Astrofisica, Osservatorio Astronomico di Padova,
on behalf of a larger collaboration, report that a spectrogram of PSN
J04450526+7247025 = SN 2011hy, obtained on Nov. 19.93 UT with the 1.82-m
Copernico Telescope (+ AFOSC; range 340-790 nm, resolution 2.2 nm), shows that
it is a type-II supernova.  The best fit to this spectrum found using a library
of supernova spectra via GELATO (Harutyunyan et al. 2008, A.Ap. 488, 383;
available at website URL https://gelato.tng.iac.es/login.cgi) suggests that
2011hy is similar to SN 2006bp (Quimby et et al. 2011, MNRAS 417, 261) at about
one week after maximum.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2011 CBAT
2011 November 22                 (CBET 2908)              Daniel W. E. Green