[IAUC] CBET 2482: 20101006 : SUPERNOVA 2010il IN NGC 6922 AND VARIABLE STAR IN NGC 1511

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                                                  Electronic Telegram No. 2482
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
CBAT Director:  Daniel W. E. Green; Hoffman Lab 209; Harvard University;
 20 Oxford St.; Cambridge, MA  02138; U.S.A.
e-mail:  cbatiau en eps.harvard.edu (alternate cbat en iau.org)
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network


SUPERNOVA 2010il IN NGC 6922 AND VARIABLE STAR IN NGC 1511
     J. Maza, M. Hamuy, R. Antezana, L. Gonzalez, P. Gonzalez, S. Silva, G.
Folatelli, R. Cartier, F. Forster, and S. Marchi, Universidad de Chile; G.
Pignata and M. Cifuentes, Universidad Andres Bello; B. Conuel, Wesleyan
University; and D. Reichart, K. Ivarsen, J. Haislip, A. Crain, D. Foster,
M. Nysewander, and A. LaCluyze, University of North Carolina at Chapel Hill,
on behalf of the CHASE project, report the discovery of two apparent supernovae
-- one of which appears to be a luminous blue variable in Aquila, from
spectroscopy.
     SN 2010il was at magnitude approximately 16.4 on an unfiltered image
taken on Sept. 29.10 UT with the 0.41-m 'PROMPT 5' telescope located at
Cerro Tololo, and at mag approximately 16.3 in an image taken on Sept. 30.11.
SN 2010il is located at R.A. = 20h29m53s.12 +/- 0".1, Decl. = -2o11'24".7 +/-
0".1 (equinox 2000.0), which is about 3".3 east and 3".9 north of the center
of the galaxy NGC 6922.  Nothing is visible at this position on archival
images taken on Sept. 18.15 (limiting mag 18.5) and 10.09 (limiting mag 18.0).
     The suspected supernova in NGC 1511 was at magnitude approximately 15.9 on
an unfiltered image taken on Sept. 29.25 UT with the 0.41-m 'PROMPT 4'
telescope located at Cerro Tololo, and at mag approximately 15.6 in an image
taken on Sept. 30.11; the variable is located at R.A. = 3h59m38s.07 +/- 0".1,
Decl. = -67o37'54".6 +/- 0".1 (equinox 2000.0), which is about 6".3 east and
8".5 north of the center of the galaxy NGC 1511.  Nothing is visible at this
position on archival images taken on Sept. 6.39 and 18.38 (limiting mag 18.0).

     N. Morrell, Las Campanas Observatory, Carnegie Supernova Project; and I.
Botti and P. Lopez, Universidad de Chile, report optical spectroscopy (range
364-920 nm) of the CHASE candidates in NGC 1511 and NGC 6922 obtained on
Sept. 30 UT with the Las Campanas 2.5-m du Pont telescope (+ WFCCD).  The
variable in NGC 1511 shows a blue continuum with strong superimposed Balmer
emission lines, suggesting this may be the outburst of a luminous blue
variable.  SN 2010il is a type-Ib/c supernova similar to SN 1999ex around
maximum light; cross-correlation with a library of supernova spectra using
the Supernova Identification code (Blondin and Tonry, 2006, Ap.J. 666, 1024)
provides an excellent match for 2010il to the spectrum of SN 1999ex at
maximum brightness.


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                         (C) Copyright 2010 CBAT
2010 October 6                   (CBET 2482)              Daniel W. E. Green