Supernova 2011hm in Pgc 7743 = Psn J02021338-0605016

Report the discovery of an apparent supernova in public images from the Catalina Sky Survey (CSS). SN 2011 UT R.A. (2000.0) Decl. Mag. Offset 2011hm Oct. 27.35 2 02 13.38 - 6 05 01.6 18.8 3".2 E, 17".5 S This variable was designated PSN J02021338-0605016 when it was posted on the Central Bureau's TOCP webpage and is here designated SN 2011hm based on the spectroscopic confirmation reported below. Further CCD magnitudes for 2011hm (unfiltered unless noted otherwise): Oct. 17.26 UT, [19.2 (CSS); 30.011, R = 17.2 (Federica Luppi, Varese, Italy; 0.36-m f/7.9 reflector + Bessell R filter; position end figures 13s.50, 00".8; reference stars from CMC-14 catalogue); 30.229, 17.8 (Joseph Brimacombe, Cairns, Australia; position end figures 13s.46, 00".9). Luppi's image is posted at the following website URL: http://www.astrogeo.va.it/pub/TOCP/PSN_G-1-6-31.jpg. Brimacombe's image is posted at URL http://www.flickr.com/photos/43846774@N02/6297260951/. L. Tomasella, S. Valenti, A. Pastorello, M. Fiaschi, and S. Benetti, Istituto Nazionale di Astrofisica, Osservatorio Astronomico di Padova, on behalf of a larger collaboration, report that a low-S/N spectrogram of PSN J02021338-0605016 = SN 2011hm was obtained on Oct. 30.94 UT with the Ekar- Copernico 1.82-m telescope (+ AFOSC; range 380-820 nm; resolution 2.2 nm). A comparison of the observed spectrum with a library of supernova spectra using the "GELATO" code (Harutyunyan et al. 2008, A.Ap. 488, 383) suggests that 2011hm is a type-II supernova. A broad H_alpha feature with P-Cyg profile is visible, along with a number of Fe II features. From the position of the minimum of the H_alpha absorption, an expansion velocity of the ejecta of about 13000 km/s is deduced....