2004IAUC.8302....1C

A. Connolly, University of Pittsburgh, on behalf of the Sloan Digital Sky Survey (SDSS) collaboration, reports the discovery of a type-Ia supernova, approximately 9 days after maximum light, on a 45-min spectrogram (range 380-980 nm) taken with the 2.5-m telescope (+ multi-fiber spectrograph) at Apache Point Observatory in the course of the SDSS main galaxy redshift survey around Feb. 20.27 UT. The following SDSS position of SN 2004ar is the centroid of the galaxy targeted by the spectroscopic observation (no imaging was obtained, unfortunately, though an SDSS image taken on 2003 Dec. 25 may show the supernova faintly), the supernova estimated as being likely within 1".5 of the targeted position: R.A. = 9h59m48s.1, Decl. = +11o28'25" (equinox 2000.0). The redshift of the host galaxy is z = 0.0604. The estimated apparent magnitudes of SN 2004ar are g = 18.6, r = 18.34, and i = 18.6 (based on the spectrophotometry and measured within the 3"-diameter aperture centered on the galaxy). Following a request from the Central Bureau, P. Holvorcem and M. Schwartz took a 240-s unfiltered (red) CCD exposure with the Tenagra 0.81-m telescope on Mar. 11.25, which shows a point-source object of mag 17.9 (that is not visible on the red Digitized Sky Survey image) located at R.A. = 9h59m48s.17, Decl. = +11o28'26".5, which is 0".9 west and 2".6 north of a nearby galaxy.