SIMBAD references

D. C. Leonard, San Diego State University; J. Moustakas, University of California at San Diego; B. J. Swift and D. McCarthy, University of Arizona; V. Bailey, E. Carrico, A. Carter, E. Chui, E. Douglas, E. Eggeman, R. Goldberg, R. Grant, K. Hartman, J. Hellerstein, E. Hooper, C. Horlick-Cruz, L. Hunter, T. Jiles, E. D. Johnson, K. Kumar, L. Lappe, J. Lee, W. Lee, F. Marsh, G. Mehta, P. Miller, R. Rampalli, J. Reed, K. Rice, H. Saldivar, M. Salgado-Flores, A. Schlingman, W. F. Schlingman, W. M. Schlingman, S. Scibelli, K. Sinclair, I. Steincamp, N. Stock, N. Todd, L. L. Aizpuru Vargas, S. Yamanaka, and E. Zachary, 2011 Advanced Teen Astronomy Camp, report that inspection of a low-dispersion optical spectrum (range 370-690 nm) of PSN J19583553+0236163 = SN 2011dn, obtained with the 2.3-m Bok telescope (+ Boller & Chivens spectrograph) at Steward Observatory on June 23 UT, shows it to be a type-Ia supernova of the SN-1991T-like sub-class, several days before maximum light. Cross-correlation with a library of supernova spectra using the "Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) finds good matches with pre-maximum (-6.4 ± 2.7 days) template spectra of SN 1991T, SN 1997br, and SN 1999aa. Adopting the NASA/IPAC Extragalactic Database (NED) recession velocity for UGC 11501 of 7572 km/s (a 21-cm H I line measurement taken from Springob et al. 2005, Ap.J. Suppl. 160, 149), the maximum absorption in the (weak) Si II line (rest 635.5 nm) is blueshifted by approximately 10100 km/s.