[IAUC] CBET 1662: 20090114 : SUPERNOVAE 2008ir, 2008is, AND 2008it

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                                                  Electronic Telegram No. 1662
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS en CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT en CFA.HARVARD.EDU (science)
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SUPERNOVAE 2008ir, 2008is, AND 2008it
     D. Sand, Harvard-Smithsonian Center for Astrophysics and Las Cumbres
Observatory Global Telescope Network; M. L. Graham and C. Bildfell, University
of Victoria; D. W. Just, S. Sivanandam, and S. Herbert-Fort, Steward
Observatory; C. J. Pritchet, University of Victoria; H. Hoekstra, Leiden; and
D. Zaritsky, Steward Observatory, report the discovery of three supernovae
discovered with g'- and r'-band images obtained at the Canada-France-Hawaii
Telescope (CFHT) with Megacam.  Spectroscopic confirmation was obtained with
the Blue Channel Spectrograph on the MMT, with utilization of the publicly
available Supernova Identification code (Blondin and Tonry 2007, Ap.J. 666,
1024).  The Megacam photometry given below all have uncertainty within +/-
0.1 mag.

 SN       2008 UT      R.A. (2000.0) Decl.        g'      Offset
 2008ir   Nov. 27      8 16 12.44  - 7 21 32.3   18.7    1".19 E, 1".55 S
 2008is   Nov. 29      7 35 14.03  +39 16 52.1   20.4    0".89 E, 1".20 S
 2008it   Dec.  3      0 20 31.48  +28 55 31.1   20.9    0".31 E, 0".21 S

The apparent host galaxy for 2008ir has g' = 22.42 +/- 0.06 and r' = 21.74
+/- 0.04.  The apparent host galaxy for 2008is has g' = 19.28 +/- 0.01 and
r' = 18.87 +/- 0.01.  The apparent host galaxy for 2008it has g' = 22.59
+/- 0.01 and r' = 21.73 +/- 0.01.  Additional magnitudes from Dec. 22:
2008ir, g' = 20.8 +/- 0.1, r' = 19.6 +/- 0.1; 2008is, g' = 21.7 +/- 0.1,
r' = 20.8 +/- 0.1.  [Regarding the designation 2008ir, see also the
editorial note on CBET 1645.]

          Additional
          Photometry            Spectroscopy            Days After
 SN        2008 UT       r'     Date 2008 UT    Type     Maximum       z
 2008ir    Nov. 27      18.6     Dec. 19         Ia       15-20      0.066
 2008is    Nov. 29      20.1     Dec. 29         Ia         20       0.12
 2008it    Dec.  3      20.9     Dec. 20         Ia        5-10      0.22


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2009 CBAT
2009 January 14                  (CBET 1662)              Daniel W. E. Green