Electronic Telegram No. 1988 Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A. IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions) CBAT@CFA.HARVARD.EDU (science) URL http://www.cfa.harvard.edu/iau/cbat.html SUPERNOVAE 2009kb-2009kj D. Young and S. Valenti, Queen's University, Belfast (QUB); A. Rest and G. Narayan, Harvard-Smithsonian Center for Astrophysics (CfA); M. Huber and S. Gezari, Johns Hopkins University (JHU); S. Rodney, Institute for Astronomy (IfA), University of Hawaii; C. Trundle, K. Smith, and S. Smartt, QUB; P. Price, IfA; C. Stubbs, CfA; J. Tonry, IfA; A. Riess, JHU; W. M. Wood-Vasey, University of Pittsburgh; M. T. Botticella, A. Pastorello, R. Kotak, M. Fraser, D. Hunter, and K. Maguire, QUB; and R. Foley, CfA, on behalf of the PS1 Science Consortium, report the discovery of nine supernovae via the Pan-STARRS Telescope #1 (PS1) sky survey. Images from PS1 Medium-Deep-Fields 7 and 8 were processed and differenced by the PS1 Image Processing Pipeline, and detections were filtered with prototype modules of the Transient Science Server at CfA and QUB. Each object was detected on three or more nights in multiple (two to ten), dithered, 240-s g-, r-, i-, and z-band exposures on any one night, spanning 3-18 days. Deep, stacked images taken during May-June 2009 were used as templates in the subtractions, and no sign of the objects are visible on those pre-discovery images (to limiting r magnitude 24). This field lies within the SDSS DR7 footprint, and these pre-discovery images confirm no sign of the supernovae. Images from April 2009 also showed no detection of the transients to r-band magnitudes of about 24. SN 2009 UT R.A. (2000.0) Decl. Mag. z Offset 2009kb May 12.54 16 12 08.54 +55 07 41.3 21.2 0.44* 1".44 E, 1".35 S 2009kc June 10.85 12 23 20.35 +46 18 14.4 21.9 0.31* -- 2009kd June 10.85 12 25 08.49 +46 59 44.2 22.0 0.28* -- 2009ke June 10.95 16 07 24.69 +54 00 17.9 21.3 -- 2009kf June 10.95 16 12 54.00 +55 38 13.8 21.8 0.182 1".10 W, 0".99 S 2009kg June 10.95 16 17 56.05 +54 58 01.3 21.9 0.34* 1".78 E, 0".84 S 2009kh June 10.96 16 13 20.25 +53 58 42.2 21.7 0.49* 1".60 W, 0".61 N 2009ki June 14.46 16 14 08.64 +55 41 41.9 21.0 0.107 0".06 E, 0".23 S 2009kj June 16.90 14 13 25.21 +52 51 31.0 21.0 0.60* 1".60 W, 1".00 S Those redshifts, z, with an asterisk tabulated above denote the SDSS photometric redshift of the presumed host galaxy. Supernovae 2009kc, 2009kd, and 2009ke are coincident with faint apparent host galaxies. Spectra were taken of 2009kf, 2009ki, and 2009kb with the GMOS spectrograph on the Gemini-North 8-m telescope on July 30.31, July 31.28, and Aug. 19.34 UT by S. Rodney, C. Trundle, S. Valenti, and A. Pastorello. SN 2009kf is a type-II-P supernova at z = 0.18, showing an expansion velocity from the P-Cyg H-alpha absorption of about 9300 km/s. PS1 lightcurve data supplemented with images from the William Herschel Telescope and the Liverpool Telescope indicate a peak absolute magnitude of M_r about -18.3 (assuming no reddening), suggesting that 2009kf is likely to be one of the most luminous type-II-P supernovae known. SN 2009kf was detected in the near ultraviolet (NUV) via GALEX Time Domain Survey (TDS) observations at 10 to 20 days after the supernova discovery, yielding a peak magnitude of [NUV] = 22.34 +/- 0.17. The host galaxy of 2009kf is detected in pre-supernova GALEX TDS observations with [NUV] = 21.58 +/- 0.15; the GALEX FUV detector was temporarily not operational during the observations. Further observations and analysis are ongoing. The host galaxy of 2009ki was detected with narrow emission lines, confirming a redshift at z = 0.107. A host-galaxy signal was detected for 2009kb, but no redshift could be determined. All of the objects are associated (i.e., within 2 arcsec) with a host galaxy detected in Sloan Digital Sky Survey (SDSS) DR7 images, apart from 2009ke, which initially appeared hostless; the deep PS1 stacked image before detection of 2009ke on June 10.95 shows a faint host galaxy, ELAIS09(R) J160724.7+5400, which has been catalogued as a galaxy in the Kitt Peak National Observatory ELIAS field R-band survey of Fadda et al. (2004, A.J. 128, 1). None of the host galaxies have SDSS spectroscopic SDSS data, and all redshifts listed above are photometric redshifts apart from 2009kf and 2009ki. These discoveries were made with the PS1 System (for additional information, see website URL http://ps1sc.org/PS1_System_IAU.htm). NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2009 CBAT 2009 October 22 (CBET 1988) Daniel W. E. Green