SIMBAD references

D. Rich, Hampden, ME, USA, reports his discovery of an apparent supernova (mag about 15.7) on unfiltered CCD frames (limiting mag 19.0) taken with a 0.41-m reflector on Nov. 19.095 and 19.964 UT. The new object is located at R.A. = 23:17:37.03, Decl. = +14:00:08.9 (equinox 2000.0), which is about 9".2 east and 4".6 north of the center of NGC 7580. The variable was designated PSN J23173703+1400089 when it was posted at the Central Bureau's TOCP webpage and is here designated SN 2012gm based on the spectroscopic confirmation reported below. Additional magnitudes for 2012gm (obtained via CCD unless noted otherwise): 1990 Oct. 23, [20.4 (Palomar Digital Sky Survey red plate); 1992 Sept. 25, [21.0 (Palomar Sky Survey blue plate); 2012 Sept. 24.085, [19.0 (Rich; CCD); Nov. 20.154, V = 15.9 (R. A. Koff, Bennett, CO, USA; Meade 0.25-m f/10 reflector + Apogee U-47 camera; limiting mag 18.1; position end figures 37s.02, 08".3; UCAC3 reference stars; image posted at URL http://antelopehillsobservatory.org/SNpictures/PSNJ23173703+1400089final.jpg); 20.484, V = 16.2 (M. Koishikawa, Sendai Astronomical Observatory, Japan; 1.3-m f/4.85 reflector; position end figures 37s.15, 09".0; UCAC-3 reference stars); 21.955, 16.5 (Paolo Corelli, Pagnacco, Italy; 0.45-m f/4.5 telescope; position end figures 37s.05, 09".1).