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ATEL # 2637; Ryan Chornock and Edo Berger (Harvard)
on 25 May 2010; 18:50 UT
Distributed as an Instant Email Notice (Supernova)
Password Certification: Ryan Chornock (firstname.lastname@example.org)
Subjects: Optical, Nova, Supernova, Transients, Variables, Stars
Referred to by ATEL #: 2640, 2658, 2660
We report on imaging and spectroscopy of SN 2010da in NGC 300 (CBET #2289) obtained on 2010 May 25.4 UT with GMOS on Gemini-South. The spectra (range 3500-10000 Angstroms) exhibit strong narrow emission lines of the H Balmer and Paschen series. The FWHM of H-alpha is approximately 660 km/s, although the line profile is not well fit by a Gaussian. The higher-order Balmer lines exhibit blueshifted P-Cygni absorption components. Emission lines of He I, Fe II, Ca II H&K, and O I are present, as is He II 4686 Angs. No strong absorption lines from Na I D are seen, indicative of low reddening and consistent with the Swift detections in the ultraviolet (ATEL #2633). In addition, although [Ca II] 7291 Angs falls in a CCD chip gap, [Ca II] 7324 Angs does not appear to be present in our spectra. We also measure a magnitude of r=16.2 mag from our acquisition images. These spectral properties, combined with the low luminosity relative to supernovae (ATEL #2632, #2633), are indicative of an LBV-like outburst of a massive star.