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Optical Nova Candidate in M31

ATel #3693; E. Ovcharov (SU, Sofia), A. Valcheva (SU, Sofia), A. Kostov (IA, Sofia), Y. Nikolov (IA, Sofia), P. Nedialkov (SU, Sofia)
on 20 Oct 2011; 04:42 UT
Credential Certification: Petko Nedialkov (japet@phys.uni-sofia.bg)

Subjects: Optical, Nova

Referred to by ATel #: 3699, 3712, 3727

We report the discovery of a probable nova located at RA(2000) = 00h42m55.78s, Dec(2000) = +41d17'52.6", which is 129.2" east and 104.1" north of the center of M31. The images are obtained with the 50/70cm Schmidt telescope at NAO Rozhen, Bulgaria. The available BVR-magnitudes are:

2011 October 19.71528 UT, R = 17.574 +/- 0.059 (from 3x300sec co-added CCD images)

2011 October 19.93366 UT, R = 16.553 +/- 0.028 (from 3x300sec co-added CCD images)
2011 October 19.94663 UT, B = 16.747 +/- 0.017 (from 3x300sec co-added CCD images)
2011 October 19.96806 UT, V = 16.536 +/- 0.020 (from 3x300sec co-added CCD images)

2011 October 20.09843 UT, R = 16.630 +/- 0.031 (from 300sec CCD image)
2011 October 20.10365 UT, B = 16.955 +/- 0.025 (from 300sec CCD image)
2011 October 20.11205 UT, V = 16.645 +/- 0.025 (from 300sec CCD image)

The nearest objects are:
- No.15746 from WeCAPP Survey - M31 variables (Fliri et al., 2006), classified as regular or semi-regular red variable, at distance 1.87".
- J004255.85+411753.5 with V=21.462 mag (M31 and M33 UBVRI photometry, Massey et al., 2006) at distance of 1.20".