Telegrama della scoperta:

Electronic Telegram No. 2169
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@cfa.harvard.edu; dwe_green@eps.harvard.edu
URL http://www.cfa.harvard.edu/iau/cbat.html


SUPERNOVA 2010Z IN NGC 2797
     Independent discovery reports have been received for an apparent
supernova in NGC 2797.
     Further to CBET 2130, X. Parisky, S. B. Cenko, W. Li, and A. V.
Filippenko, University of California, report the LOSS discovery of the
new object, designated 2010Z, on unfiltered KAIT images.  Also, Simone
Leonini, Siena, Italy, reports the discovery of 2010Z on an unfiltered CCD
image (limiting mag about 18.8) taken during his supernova search program
using a 0.53-m f/7.8 Ritchey-Chretien telescope (+ Apogee Alta U47 CCD
camera) at the Montarrenti Observatory.  The discovery observations are
tabulated below:

 2010 UT       R.A. (2000.0) Decl.      Mag.      Offset           Observer
 Feb. 3.34    9 16 21.30  +17 43 40.6   16.7    5".4 W, 2".4 N     KAIT
 Feb. 8.896   9 16 21.25  +17 43 42.4   15.6    8" W, 4" N         Leonini

Additional approximate magnitudes for 2010Z:  2008 Dec. 30.039, [18.5
(Leonini); 2010 Jan. 15.43 UT, [18.1 (KAIT); Feb. 5.51, 17.0 (J. Brimacombe,
Cairns, Australia; co-added image from six 600-s unfiltered images taken
remotely with a 0.5-m telescope located near Mayhill, NM, U.S.A.).  Leonini
adds that nothing is visible at this position on Palomar Sky Survey
infrared, red, and blue plates.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2010 CBAT
2010 February 10                 (CBET 2169)              Daniel W. E. Green

Circolare con la quale viene classificata la supernova

                                                  
Electronic Telegram No. 2173
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@cfa.harvard.edu; dwe_green@eps.harvard.edu
URL http://www.cfa.harvard.edu/iau/cbat.html


SUPERNOVA 2010Z IN NGC 2797
     I. K. W. Kleiser, J. M. Silverman, A. J. L. Morton, and A. V. Filippenko,
University of California, Berkeley, report that inspection of a CCD spectrum
(range 340-1020 nm), obtained on Feb. 14 UT with the 3-m Shane reflector (+
Kast) at Lick Observatory, shows that 2010Z (CBET 2169) is a type-II supernova.
After removal of the host-galaxy recession velocity of 7600 km/s, determined
from narrow emission lines, the absorption minimum of the H-alpha line is
found to be blueshifted by 8700 km/s and is much weaker than the emission
component.  Cross-correlation with a library of supernova spectra using the
"SuperNova IDentification" code (SNID; Blondin and Tonry 2007, Ap.J. 666,
1024) indicates that 2010Z is within a week or two of maximum light.


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

                         (C) Copyright 2010 CBAT
2010 February 14                 (CBET 2173)              Daniel W. E. Green