2012CBET.3187....3M

Kate Maguire, Department of Physics, University of Oxford, writes that a spectrogram of PSN J00563888-0954091 = SN 2012dt, obtained on July 20.5 UT with the Double Beam Spectrograph on the Palomar 5-m telescope, shows broad P-Cyg H_alpha emission with a velocity (half-width) of 1600 km/s and absorption minimum at 8084 km/s. Running the "Superfit" software yields a best match to the spectrum of the type-II supernova 1999em at +9 days.