2011CBET.2825....1J

Zhangwei Jin (Ningbo, Zhejiang, China) and Xing Gao (Urumqi, Xinjiang, China) report the discovery of a possible supernova (mag approximately 16.8) on an unfiltered 60-s survey CCD image (limiting mag about 19.0) taken by Xing Gao on Sept. 15.769 UT in the course of the Xingming Observation Sky Survey at Mt. Nanshan (Celestron C14 0.35-m f/6.9 Schmidt-Cassegrain telescope). The new object is approximately located at R.A. 22:17:19.52, Decl. = +35:34:50.0 (equinox 2000.0), which is about 2".0 west and 34" north of the center of UGC 11975. Nothing is visible at this position on their archival images taken on Aug. 24 (limiting mag 19.5) or on a Digitized Sky Survey image from 1986 Sept. 26 (limiting red mag about 19.8). The discoverers have posted their image at website URL http://www.xjltp.com/XOSS/XM23ZJ/XM23ZJ.htm. When the object was posted on the Central Bureau's TOCP webpage, it was given the preliminary designation PSN J22171952+3534500; it is here given the designation SN 2011fs based on the spectroscopy reported below. Additional CCD magnitudes (unfiltered unless noted otherwise) for 2011fs: Sept. 16.519, R = 16.5 (J. Brimacombe, Cairns, Australia; position end figures 19s.52, 49".9); 16.555, 17.2 (Brimacombe; infrared filter; position end figures 19s.51, 49".9); 17.388, 16.3 (Brimacombe; position end figures 19s.54, 49".9); 17.438, 16.6 (T. Noguchi, Katori, Chiba-ken, Japan; 0.23-m f/6.3 Schmidt-Cassegrain telescope + BITRAN BT-11E camera; limiting mag 18.0; position end figures 19s.48, 50".0; UCAC3 reference stars; communicated via Syuichi Nakano, Sumoto, Japan); 19.575, 16.1 (Jin and Gao; position end figures 19s.50, 49".6); 20.274, 15.8 (Brimacombe). The Sept. 17 image by Brimacombe is posted at URL http://www.flickr.com/photos/43846774@N02/6157852436/; his Sept. 20.274 image is posted at http://www.flickr.com/photos/43846774@N02/6174570633/.