2010CBET.2536....2V

J. Vinko, University of Szeged; G. H. Marion, Harvard-Smithsonian Center for Astrophysics and University of Texas; T. Pritchard, Pennsylvania State University; and J. C. Wheeler and E. Chatzopoulos, University of Texas, also report that 2010jl is a type-IIn supernova. A spectrum obtained on Nov. 5.5 UT with the 9.2-m Hobby-Eberly Telescope (+ Marcario Low-Resolution Spectrograph) by M. Shetrone shows a bright, blue continuum with strong, intermediate-width emission lines (FWHM about 2000 km/s). Besides strong Balmer lines, He I features at 587.6 and 706.5 nm are clearly visible. The He I feature at 667.8 nm is detectable but blended by the extended red wing of H-alpha. The presence of H and He lines indicates that the transient is a type-IIn supernova where the intermediate-width emission lines are formed in a shocked circumstellar medium enveloping the supernova. Simultaneous measurements with Swift/UVOT in the ultraviolet bands confirm that the transient is ultraviolet-bright, as expected for young, interacting supernovae. Further follow-up observations in all wavelengths are encouraged.