Discovery of SNF20051021-001, a Type II Supernova
ATel #639; The Nearby Supernova Factory: P. Antilogus, S. Gilles, R. Pain, R. Pereira (Laboratoire de Physique Nucleaire et de Haute Energies de Paris), N. Blanc, S. Bongard, Y. Copin, E. Gangler, L. Sauge, G. Smadja (Institut de Physique Nucleaire de Lyon), G. Aldering, S. Bailey, D. Kocevski, B. C. Lee, S. Loken, P. Nugent, S. Perlmutter, R. Scalzo, R. C. Thomas, L. Wang, B. A. Weaver (Lawrence Berkeley National Laboratory, Berkeley, CA), C. Bonnaud, E. Pecontal (Centre de Recherche Astronomique de Lyon), R. Kessler (Kavli Institute for Cosmological Physics, Chicago, IL), C. Baltay, D. Rabinowitz, A. Bauer (Yale)
on 24 Oct 2005; 04:16 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: R. C. Thomas (rcthomas@lbl.gov)
Subjects: Optical, Supernovae
The Nearby Supernova Factory reports the discovery of supernova SNF20051021-001 (coordinates RA 04:16:12.37 DEC -13:13:11.6 J2000.0) in images obtained October 21.5 UT at an approximate magnitude of 17.8 (calibrated to R) using the Quest II camera on the Palomar Oschin 48-inch telescope as a part of the JPL Near-Earth Asteroid Tracking component of the Palomar Consortium. A spectrum (range 320-1000 nm) of this supernova, obtained October 23.5 UT with the Supernova Integral Field Spectrograph on the University of Hawaii 2.2-meter telescope, shows it to be a Type II supernova at an approximate redshift of z = 0.03. The spectrum consists of a red continuum with obvious broad H-alpha in emission, and He I 587.6 nm, Ca II IR triplet P-Cygni profiles. Comparison to a library of supernova spectra reveals a similarity to the spectrum of the Type IIb SN 1993J at 18 days after core collapse (as estimated by Richmond et al. 1994, AJ 107, 1022). A faint host galaxy is discernible on Digitized Sky Survey images below the B ~ 21 limit of the USNO-B1 catalog. Adopting the approximate redshift of z = 0.03 for the host, we derive a low luminosity, M_B ~ -14.5, for the host.