2010CBET.2548....1C

P. Challis and R. Kirshner, Harvard-Smithsonian Center for Astrophysics (CfA); and N. Smith, University of Arizona, on behalf of the CfA Supernova Group, report that spectroscopic observations (range 320-850 nm) of 2010jr (cf. CBET 2545), obtained on Nov. 14.3 UT with the MMT (+ blue-channel spectrograph), show a smooth and very blue continuum that resembles that seen in spectra of SN 1993J from two weeks before maximum light. A spectrum of 2010jp (cf. CBET 2544) shows the Balmer series lines of a type-IIn supernova; broad red wings extend to +15000 km/s, with much sharper absorptions on the blue side at approximately -3000 km/s, which resemble the line profiles seen in spectra of SN 2006gy. A spectrum of 2010js (cf. CBET 2546) shows the symmetric Balmer lines with widths of approximately 4000 km/s (FWZI) seen in type-IIn supernovae; the redshift for this object in UGC 4294 is z = 0.039.