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Holtzman, J. Krzesi\\'nski, J. L. Marshall, J. L. Prieto, J. Marriner, K. Konishi, K. Pan, K. Tokita, K. van der Heyden, M. Doi, M. Harvanek, M. Im, M. Sako, M. Smith, M. W. Richmond, N. Takanashi, N. Yasuda, P. M. Garnavich, R. C. Nichol, R. J. McMillan, R. Kessler, R. Romani, S. A. Snedden, S. Jha, S. J. Kleinman, S. Watters, V. Malanushenko, W. Ketzeback","submitted_at":"2008-01-22T15:15:27Z","abstract_excerpt":"We present a measurement of the rate of type Ia supernovae (SNe Ia) from the first of three seasons of data from the SDSS-II Supernova Survey. For this measurement, we include 17 SNe Ia at redshift $z\\le0.12$. Assuming a flat cosmology with $\\Omega_m = 0.3=1-\\Omega_\\Lambda$, we find a volumetric SN Ia rate of $[2.93^{+0.17}_{-0.04}({\\rm systematic})^{+0.90}_{-0.71}({\\rm statistical})] \\times 10^{-5} {\\rm SNe} {\\rm Mpc}^{-3} h_{70}^3 {\\rm year}^{-1}$, at a volume-weighted mean redshift of 0.09. 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