2007CBET.1007....1A

The "Nearby Supernova Factory" collaboration (P. Antilogus, R. Pain, R. Pereira, C. Wu, Laboratoire de Physique Nucleaire et de Haute Energies de Paris; G. Aldering, C. Aragon, S. Bailey, S. Bongard, M. Childress, S. Loken, P. Nugent, S. Perlmutter, K. Runge, R. C. Thomas, and B. A. Weaver, Lawrence Berkeley National Laboratory, Berkeley; C. Baltay, A. Bauer, D. Rabinowitz, and R. Scalzo, Yale University; G. Rigaudier and E. Pecontal, Centre de Recherche Astronomique de Lyon; C. Buton, Y. Copin, E. Gangler, and G. Smadja, Institut de Physique Nucleaire de Lyon; D. Birchall, Institute for Astronomy, University of Hawaii, Hilo; and J. Holtzman, New Mexico State University, Las Cruces) reports the discovery of four supernovae in images obtained during July 13-14 UT using the QUEST-II camera on the Palomar Oschin 1.2-m Schmidt telescope, operated by the Palomar-QUEST Consortium. Spectra (range 320-1000 nm) obtained with the SuperNova Integral Field Spectrograph on the University of Hawaii 2.2-m telescope were used to classify each supernova. R-band discovery magnitudes and astrometry are derived from comparison with the USNO-B1.0 catalogue. The following table summarizes the discovery information, including redshifts (z). SN 2007 UT R.A. (2000.0) Decl. Mag. z Type 2007fu July 13.3 20 30 28.88 -13 15 34.9 19.0 0.06 Ia 2007fv July 13.4 23 03 51.58 -21 08 52.2 19.7 0.03 II 2007fw July 14.2 15 21 09.14 + 2 26 26.3 19.5 0.05 IIn 2007fx July 14.3 20 55 57.48 - 5 41 54.9 18.5 0.06 Ia The spectrograms for 2007fu (three weeks past maximum) and 2007fv were obtained on July 14.4-14.5 UT. The spectrograms for 2007fx (1-2 weeks past maximum) and 2007fw were obtained on July 17.5 and 17.3. SN 2007fw was not present in images obtained on July 3 (no limiting magnitude provided).