[IAUC] CBET 1861: 20090625 : SUPERNOVAE 2009gm-2009gs AND POSSIBLE SUPERNOVAE K0905-10, K0905-11, K0905-12

Jue Jun 25 17:20:08 ART 2009

                                                  Electronic Telegram No. 1861
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)
URL http://www.cfa.harvard.edu/iau/cbat.html


SUPERNOVAE 2009gm-2009gs AND POSSIBLE SUPERNOVAE K0905-10, K0905-11, K0905-12
     Further to CBET 1830, A. J. Drake, S. G. Djorgovski, A. Mahabal, M. J.
Graham, and R. Williams, California Institute of Technology; M. Catelan,
Pontificia Universidad Catolica de Chile; E. C. Beshore, S. M. Larson, R. Hill,
R. Kowalski, A. Boattini, and A. Gibbs, Lunar and Planetary Laboratory,
University of Arizona; and E. Christensen, Gemini Observatory, report the CRTS
discovery of several apparent supernovae and three possible supernovae in
unfiltered Catalina Sky Survey (CSS) images:

 SN       2009 UT       R.A. (2000.0) Decl.       Mag.      Offset
 2009gm   May  23.16   14 27 58.10  +11 24 33.9   18.2   8".7 E, 8".9 S
 2009gn   May  26.30   16 05 23.53  -16 08 34.2   18.0   2".2 W, 5".6 N
 2009go   May  29.36   16 38 54.17  +21 49 06.0   18.3   2".0 W, 2".0 N
 2009gp   May  30.25   14 19 33.93  + 2 44 45.5   19.0   0".2 W, 2".0 N
 2009gq   June  2.40   22 14 52.81  +17 30 47.2   18.3   5".5 W, 14".7 N
 2009gr   June 14.42   17 25 38.28  +19 07 05.8   18.8   3".5 E, 3".0 N
 2009gs   June 15.44   21 18 49.42  - 5 57 10.8   16.6   1".1 E, 0".4 N

 PSN        2009 UT       R.A. (2000.0) Decl.      Mag.      Offset
 K0905-10   May 23.16   14 26 47.44  +12 35 29.1   18.5   0".4 E, 0".8 N
 K0905-11   May 26.27   13 51 43.30  + 9 06 53.2   19.4   0".2 W, 0".1 N
 K0905-12   May 30.35   14 20 21.31  +29 11 59.4   19.1   1".1 W, 0".2 N

Discoveries were compared with reference images from deeper Sloan Digital
Sky Survey, Canada-France-Hawaii Telescope, and Digitized Sky Survey images,
as well as CSS and "Palomar Quest" co-added images and CSS lightcurves.  The
objects were followed with the Palomar 1.5-m telescope using Gunn filters.
     Further magnitudes for 2009gm:  Apr. 28.38, [20.7 (CSS); May 27.22, g =
18.9, r = 18.0, i = 18.1 (Palomar); June 1.25, 18.4 (CSS); 16.24, 19.2 (CSS).
     Further magnitudes for 2009gn:  Apr. 19.43, [20.2 (CSS); 30.39, 18.5
(CSS); May 27.23, g = 18.6, r = 18.3, i = 18.5 (Palomar); June 14.26, 18.6
(CSS).
     Further magnitudes for 2009go:  May 4.37, [20.4 (CSS); 16.33, 18.7 (CSS);
June 2.22, g = 18.4, r = 18.4, i = 18.6 (Palomar); 4.20, g = 18.8, r = 18.8,
i = 18.6 (Palomar); 16.42, g = 19.7, r = 19.5, i = 19.8 (Palomar); 21.33,
19.6 (CSS).
     Further magnitudes for 2009gp:  Apr. 27.35, [20.2 (CSS); May 24.27, 18.9
(CSS); June 2.21, g = 19.2, r = 18.9, i = 19.2 (Palomar); 15.25, 19.8 (CSS).
     Further magnitudes for 2009gq:  Apr. 29.48, [20.2 (CSS); June 11.44, 18.7
(CSS); 16.41, g = 19.2, r = 18.9 (Palomar); 22.40, 19.2 (CSS).
     Further magnitudes for 2009gr:  Feb. 5.53, [20.0 (CSS); May 27.37, 18.1
(CSS); June 22.37, 19.3 (CSS).
     Further magnitudes for 2009gs:  May 27.44, [20.1 (CSS); June 16.44,
g = 16.4, r = 16.5, i = 16.6 (Palomar).
     Further magnitudes for K0905-10:  Apr. 18.44 UT, [20.0 (CSS); 28.38,
19.5 (CSS); May 27.22, g = 18.6, r = 18.6, i = 18.7 (Palomar); June 1.25, 18.6
(CSS); 16.24, 19.3 (CSS).
     Further magnitudes for K0905-11:  Apr. 28.35, [20.5 (CSS); May 27.22, g =
19.4, r = 19.4, i = 19.4 (Palomar); June 11.26, 19.9 (CSS).
     Further magnitudes for K0905-12:  May 13.37, [20.5 (CSS); June 2.20, g =
19.3, r = 19.3, i = 19.4 (Palomar); 17.18, 19.5 (CSS).

     D. Milisavljevic, R. Fesen, and J. Parrent, Dartmouth College, report
that a low-dispersion spectrum (range 420-790 nm) of 2009gs, obtained on
June 20.7 UT with the 2.4-m Hiltner telescope (+ CCDS) at MDM Observatory,
shows it to be a normal type-Ia supernova.  Comparison with a library of
supernova spectra using the "SuperNova IDentification" code (SNID; Blondin
and Tonry 2007, Ap.J. 666, 1024) provides a good match with the normal type-Ia
supernova 1995E at maximum light.


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

                         (C) Copyright 2009 CBAT
2009 June 25                     (CBET 1861)              Daniel W. E. Green