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SN 1999aw was discovered during the first campaign of the Nearby GalaxiesSupernova Search (NGSS) project. This luminous, slow-declining (Delta m_{15}(B) = 0.81 \pm 0.03) Type Ia supernova was noteworthy in at least two respects.First, it occurred in an extremely low luminosity host galaxy that was notvisible in the template images, nor in initial subsequent deep imaging.Secondly, the photometric and spectral properties of this supernova indicatethat it very likely was similar to the subclass of Type Ia supernovae whoseprototype is SN 1999aa. This paper presents the BVRI and J_{s} HK_{s}lightcurves of SN 1999aw (through 100 days past maximum light), as well asseveral epochs of optical spectra. From these data we calculate the bolometriclight curve, and give estimates of the luminosity at maximum light and theinitial ^{56}Ni mass. In addition, we present deep BVI images obtained recentlywith the Baade 6.5-meter telescope at Las Campanas Observatory which reveal theremarkably low-luminosity host galaxy.Comment: 18 pages, 10 figures, 8 tables, accepted for publication in A

The Type I[CLC]a[/CLC] Supernova 1999[CLC]aw[/CLC]: A Probable 1999[CLC]aa[/CLC]-like Event in a Low-Luminosity Host Galaxy