Electronic Telegram No. 2623

Central Bureau for Astronomical Telegrams
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138,
U.S.A. IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
URL http://www.cfa.harvard.edu/iau/cbat.html

G. Pignata and M. Cifuentes, Universidad Andres Bello; J. Maza, M. Hamuy, R. Antezana, L. Gonzalez, R. Cartier, F. Forster, S. Silva, and F. Carrasco, Universidad de Chile; P. Gonzalez, Pontificia Universidad Catolica de Chile; B. Conuel, Wesleyan University; G. Folatelli, IPMU, University of Tokyo; and D. Reichart, K. Ivarsen, J. Haislip, A. Crain, D. Foster, M. Nysewander, and A. LaCluyze, University of North Carolina at Chapel Hill, on behalf of the CHASE project, report the discovery of an apparent supernova (mag approximately 16.9) on an unfiltered image taken on Jan. 2.30 UT with the 0.41-m 'PROMPT 4' telescope located at Cerro Tololo. The new object, which was confirmed at mag approximately 16.6 on images taken with the same telescope on Jan. 5.27 and 7.31, is located at R.A. = 13h01m01s.19 +/- 0".2, Decl. = -14°31'34".8 +/- 0".2 (equinox 2000.0), which is about 21".3 east and 46".5 south of center of the galaxy NGC 4902. Nothing is visible at this position on archival images taken on 2010 May 1.18 and July 13.05 (limiting mag 18.5). SNe 1979E (cf. IAUC 3395) and 1991X (cf. IAUC 5258, 5263, 5288) also appeared in NGC 4902.
M. Stritzinger, Oskar Klein Centre, Stockholm University; J. L. Prieto and N. Morrell, Carnegie Observatories; and G. Pignata, Universidad Andres Bello, report that they obtained optical spectra of 2011A on Jan. 4.2 and 4.7 UT with the du Pont telescope (+ WFCCD) and the Gemini North telescope (+ GMOS). This variable appears to be a type-IIn supernova, most similar to supernova 2005cl (Kiewe et al. 2010, http://lanl.arxiv.org/abs/1010.2689).
2011 January 08
(C) Copyright 2010 CBAT
(CBET 2623)
Daniel W. E. Green