Electronic Telegram No. 2226 Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION CBAT Director: Daniel W. E. Green; Room 209; Dept. of Earth and Planetary Sciences; Harvard University; 20 Oxford St.; Cambridge, MA 02138; U.S.A. e-mail: cbat@iau.org; cbatiau@eps.harvard.edu URL http://www.cfa.harvard.edu/iau/cbat.html SUPERNOVAE 2010aq, 2010ar, AND 2010bb-2010bg Further to CBET 2214, E. Kankare, Nordic Optical Telescope and Queen's University, Belfast (QUB); A. Pastorello and S. Valenti, QUB; S. Mattila, Tuorla Observatory and QUB; R. Chornock, R. Foley, A. Rest, and G. Narayan, Harvard-Smithsonian Center for Astrophysics (CfA); M. Huber, Johns Hopkins University (JHU); D. Young, K. Smith, and S. Smartt, QUB; J. Tonry and P. A. Price, Institute for Astronomy, University of Hawaii; C. Stubbs, CfA; A. Riess, JHU; W. M. Wood-Vasey, University of Pittsburgh; and E. Berger, CfA, report the discovery of an additional six spectroscopically-confirmed supernovae in the Pan-STARRS1 (PS1) Medium Deep Survey. Spectroscopic classifications were obtained using low-resolution spectra obtained with the Nordic Optical Telescope (+ ALFOSC; range 320-910 nm) on Jan. 21-22 for 2010bb (PS1-1000018), 2010bd (PS1-1000017), and 2010be (PS1-1000021), on Feb. 6 for 2010bc (PS1-1000032), and on Mar. 8 for 2010bf (PS1-1000034) and 2010bg (PS1-1000033). The discovery dates and magnitudes at that time are tabulated below. SN 2010 UT R.A. (2000.0) Decl. Mag. Offset z 2010bb Jan. 16.6 10 44 38.217 +57 48 40.08 20.4 0".1 W 0.118 2010bc Jan. 16.6 10 48 07.057 +56 51 00.44 22.5 0".1 E, 0".4 S 0.244 2010bd Jan. 16.6 12 19 37.532 +46 01 55.98 22.7 1".0 W, 1".0 S 0.057 2010be Jan. 19.2 2 19 46.550 -03 12 10.51 20.2 0".1 E, 0".2 S 0.183 2010bf Feb. 24.4 10 48 15.786 +57 24 19.47 20.2 0".5 N 0.074 2010bg Feb. 24.5 10 57 41.253 +57 36 47.90 20.4 0".2 W, 0".4 S 0.081 Additional magnitudes: 2010bc, Jan. 17.5, 22.1; 2010bd, Jan. 13.6, 22.1; 2010bg, Feb. 25.5, 20.1. The redshifts of 2010bb and 2010be were determined from the host galaxy Ca II H and K and Na I D interstellar absorption lines, and the redshift for 2010bf from the narrow emission lines of the host galaxy. For 2010bc, a redshift of 0.244 was determined from host- galaxy emission lines using a spectrum obtained on Mar. 13 using GMOS on the Gemini-North telescope (P.I. Berger). The redshifts for 2010bd and 2010bg are the spectroscopic redshifts of their host galaxies (SDSS J121937.40+460156.8 and SDSS J105741.30+573648.4). According to the relation of Turatto et al. (2002, http://lanl.arxiv.org/abs/astro-ph/0211219), the Na I D lines indicate a reddening of E(B-V) around 0.39 and 0.43 for 2010bb and 2010be, respectively; comparison of their de-reddened spectra with a library of supernova spectra using the "GELATO" code (Harutyunyan et al. 2008, A.Ap. 488, 383) yields the best match for both with the spectra of type-Ia supernovae slightly before or around maximum light. For 2010bd, a match is found with a type-II supernova at a few weeks after the explosion; for 2010bc, with a type-Ia supernova at two weeks past maximum; and for 2010bg, with a type-Ia supernova around the maximum light. The spectrum of 2010bf is found to be similar to type-Ic-supernova spectra around maximum light. Regarding CBET 2214, Valenti reports that SNe 2010aq and 2010ar also were initially discovered on images from Feb. 12.4, when they were at mag 21.7 and 19.3, respectively; the magnitudes tabulated there for Feb. 15.4 are correct. NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2010 CBAT 2010 March 23 (CBET 2226) Daniel W. E. Green