SUPERNOVA
2011fo IN ESO 400-33 = PSN J20301588-3448325
G. Pignata and M. Cifuentes, Universidad Andres Bello;
J. Maza, M. Hamuy, R. Antezana, L. Gonzalez, R. Cartier,
F. Forster, S. Silva, F. Carrasco, P. Sanchez, C.
Hervias, D. Iturra, and R. Ramirez, Universidad de
Chile; 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 16.9) on an unfiltered CCD image taken
on Sept. 1.11 UT with the 0.41-m 'PROMPT 5' telescope
located at Cerro Tololo. The new object, which is
also present at mag approximately 16.8 on an image
taken on Sept. 2.98, is located at R.A. = 20h30m15s.88
+/- 0".2, Decl. = -34°48'32".5 +/- 0".2 (equinox
2000.0), which is about 6".6 east and 10".7 north
of center of the galaxy ESO 400-33. Nothing is visible
at this position on archival images taken on July
22.23 (limiting mag 18.5) and Aug. 11.17 (limiting
mag 18.0). The new object was designated PSN J20301588-3448325
when it was posted on the Central Bureau's TOCP webpage
and is here designated SN 2011fo based on the spectroscopic
report below.
E. Cappellaro, S. Benetti, and A. Pastorello, Istituto
Nazionale di Astrofisica, Osservatorio Astronomico
di Padova; F. Bufano, Istituto Nazionale di Astrofisica,
Osservatorio Astronomico di Catania; and G. Pignata,
Universidad Andres Bello, on behalf of a larger collaboration,
report that a spectrogram (range 330-750 nm; resolution
1.5 nm) of PSN J20301588-3448325 = SN 2011fo, obtained
on Sept. 6.1 UT with the European Southern Observatory's
New Technology Telescope (+ EFOSC), shows that 2011fo
is a young, heavily extinguished [E(B-V) about 0.7],
type-II supernova. After cross-correlation with a
library of supernova spectra via the "GELATO" code
(Harutyunyan et al. 2008, A.Ap. 488, 383; available
at URL https://gelato.tng.iac.es/login.cgi), the spectrum
appears similar that of SN 2009at few days after explosion.
NOTE: These 'Central Bureau Electronic
Telegrams' are sometimes superseded by text appearing
later in the printed IAU Circulars.