Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

CBAT "Transient Object Followup Reports"

PNV J00412371+4114594

PNV J00412371+4114594   2017 12 20.8507*  00 41 23.71 +41 14 59.4  15.5 C  906W  74S  M31       9 0

2017 12 20.8507

Emmanuel Conseil reports the discovery of a 15.5 magCV transient on 3x50s exposures taken with Slooh robotic telescope T2WF (17" F/6.8 + FLI PL16803) on 2017-12-20 at 20h25 UT. The transient is also visible on 3x50s exposures taken with Slooh robotic telescope T2UWF at the same moment(85mm F/7, focal reducer 0.8x, SBIG ST-10XME). This transient is located very close to the location of the dwarf nova M31N 1966-08a (also known as M31N 1968-10c) and could be a new outburst of this object. On 2017-12-20 at 21h29 UT, the transient has faded a lot on 3x50s new exposures, and is barely visible on 3 more images taken at 22h06 UT. Stacked (x3) images are available here for T2WF telescope : https://www.flickr.com/photos/econseil/38314239035 Stacked (x3) image is available here for T2UWF telescope : https://www.flickr.com/photos/econseil/39190450131

2017 12 21.8750

The transient has now disappeared (limiting magnitude ~19.5). Looking for litterature about its possible parent (M31N 1966-08a), I've found a very recent paper (https://arxiv.org/pdf/1712.05023.pdf), submitted last week, and showing that the outburst 50 years ago is probably not the consequence of a nova, but most likely a flaring star. That's the conclusion of Shafter et al. That might explain the rapid fading seen during the night of Dec 20th.

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