Candidate #2: Abell 1961
Variable source superposed very near to the center of the host nucleus.
Keck spectroscopy (Courtesy of R. Guhathakurta, G. Smith, A. Filippenko
and R. Chornock) confirms this is a type Ia SN in one of the cluster galaxies.
Constructed: December 2001, by: Avishay Gal-Yam , E-Mail: email@example.com