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Recurrent Nova M31N 2008-12a: Additional observations, pre-detection limit, and erratum to ATel #6527

ATel #6535; M. J. Darnley (LJMU), S. C. Williams (LJMU), M. F. Bode (LJMU), A. W. Shafter (SDSU), M. Henze (ESAC), J.-U. Ness (ESAC), R. A. Hounsell (STSCI)
on 4 Oct 2014; 00:45 UT
Credential Certification: Matt Darnley (M.J.Darnley@ljmu.ac.uk)

Subjects: Optical, Nova

Referred to by ATel #: 6540, 6543, 6546

The discovery of a sixth eruption in seven years of the M31 recurrent nova M31N 2008-12a was reported in ATel #6527.

Unfortunately, the magnitude of the eruption was reported incorrectly in ATel #6527. The correct magnitude on 2014 October 2 21:41 UT was r' = 18.86 ± 0.02. This is more consistent with the peak luminosity of the previous eruptions (see Darnley et al. 2014, and Tang et al. 2014).

In addition to the pre-detection upper limit reported by iPTF in ATel #6532; this new eruption was not detected in a Liverpool Telescope Sloan r'-band image taken on 2014 October 1 21:49 UT, here we derive a 5-sigma limiting magnitude of r' > 20.4.

A Liverpool Telescope 120s r'-band image taken on 2014 October 3 21:19 UT indicated that the recurrent nova had increased in brightness to r' = 18.47 ± 0.01.