2009CBET.1988....1Y

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.