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PNV J00425773+4108123 is the 2015 Eruption of Recurrent Nova M31N 1963-09c

ATel #8234; S. C. Williams (LJMU), A. W. Shafter (SDSU), K. Hornoch (Astronomical Institute, Ondrejov, Czech Republic), M. Henze (IEEC/CSIC), M. J. Darnley (LJMU)
on 31 Oct 2015; 23:20 UT
Credential Certification: Allen W. Shafter (ashafter@mail.sdsu.edu)

Subjects: Optical, Nova, Transient

Referred to by ATel #: 8235, 8238, 8242, 8243, 8290, 9280

The nova candidate PNV J00425773+4108123 (M31N 2015-10c) was discovered independently by the Lick Observatory Supernova Search (CBAT TOCP) and Hornoch et al. (ATel #8233). Comparing the position to previous M31 nova eruptions (Pietsch et al. catalogue), we find the position is coincident to within 0.41 arcsec of M31N 1963-09c, one of the M31 recurrent novae identified by Shafter et al. (2015), having previous observed eruptions in 1963, 1968, 2001 and 2010. The probability of a chance positional coincidence at this location in M31 is estimated to be P ~ 0.001 based on the reported positions and Eqn (1) of Shafter et al. (2015). Thus, we conclude that PNV J00425773+4108123 is the 5th recorded eruption of M31N 1963-09c.

The recurrence period of five years is shorter than any Galactic recurrent nova and second only to the one-year recurrent nova M31N 2008-12a (see e.g. Darnley et al. 2015 and Henze et al. 2015a, 2015b) among all known recurrent novae. Therefore we strongly encourage further observations of this outburst.