SUPERNOVA
2011bj = PSN J20522450-3335540 J. Maza, M. Hamuy,
R. Antezana, L. Gonzalez, R. Cartier, F. Forster,
S. Silva, F. Carrasco, P. Sanchez, C. Hervias, and
D. Iturra, Universidad de Chile; G. Pignata and M.
Cifuentes, Universidad Andres Bello; C. Farias, Pontificia
Universidad Catolica de Chile; B. Conuel, Wesleyan
University; G. Folatelli, IPMU, University of Tokyo;
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 (which is part of the Millennium Center
for Supernova Science collaboration), report the discovery
of an apparent supernova (mag approximately 17.6)
on an unfiltered images taken on Apr. 3.37 and 4.40
UT with the 0.41-m 'PROMPT 3' telescope located at
Cerro Tololo. The new object (which was designated
PSN J20522450-3335540 when posted on the Central Bureau's
TOCP webpage and is here designated SN 2011bj due
to the spectroscopic report below) is located at R.A.
= 20h52m24s.51 +/- 0".2, Decl. = -33°35'54".1 +/-
0".2 (equinox 2000.0), which is about 8".9 west and
12".5 north of center of the presumed host galaxy.
Nothing is visible at this position on archival images
taken on 2010 Oct. 11.14 and 24.10 (limiting mag 18.5).
N. Morrell,
Las Campanas Observatory; P. Lira, Universidad de
Chile; and G. Pignata, Universidad Andres Bello, on
behalf of the Millennium Center for Supernova Science,
report optical spectroscopy (range 360-920 nm) of
PSN J20522450-3335540 = SN 2011bj obtained on Apr.
6.3 UT with the Las Campanas 2.5-m du Pont telescope
(+ WFCCD). Cross-correlation with a library of supernova
spectra using the "Supernova Identification" code
(SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) shows
that 2011bj is a type-IIP supernova about a month
after explosion.
NOTE: These 'Central Bureau Electronic
Telegrams' are sometimes superseded by text appearing
later in the printed IAU Circulars.