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M31 Nova Candidate is a Background Supernova

ATEL # 1866; R. M. Quimby, M. M. Kasliwal (Caltech)
on 7 Dec 2008; 3:13 UT
Password Certification: Robert Quimby (

Subjects: Optical, Nova, Supernova, Transients

We observed the optical transient located at RA = 00h43m18.65s DEC = +42o10'14.3" (J2000), which is listed on David Bishop's Extragalactic Novae page as a possible M31 nova discovered by Koichi Itagaki, on Dec 4.22 UT with the Double Beam Spectrograph (DBSP) on the Palomar 200" Hale Telescope. The transient shows broad absorption features consistent with a normal Type Ia supernova near maximum light at an approximate redshift of z=0.07.

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