Recurrent Nova M31N 2008-12a: pre-discovery observations with LATTE at Lulin Observatory

ATel #16365; Mi Zhang, Jingyuan Zhao (Xingming Observatory), Weihao Wang (Institute of Astronomy and Astrophysics, Academia Sinica), Guoyou Sun, Jianlin Xu, Wenjie Zhou, Jiangao Ruan, Xing Gao (Xingming Observatory)
on 6 Dec 2023; 08:33 UT
Credential Certification: Matt Darnley (matt_darnley@icloud.com)

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We report the pre-discovery and multi-colour follow-up of the recurrent nova M31N 2008-12a (see ATels #16361, #16362, #16364) using the 0.50-m f/6.8 Lulin-ASIAA Telescope for Transients and Education (LATTE) located at Lulin Observatory (IAU Code D35), Chiayi, Taiwan, China.

All photometric observations listed below were obtained in the B, V, R, I filters between 2023-12-05.54037 UTC and 2023-12-05.67382 UTC.

Together with the undetected upper limit of Shafter et al. (ATel #16362), our pre-discovery constrains the outburst time with an uncertainty of only about 0.33 days.

 
Start Time [UTC] |  Mag.  | Err. | Filter  |  Expouse 
2023-12-05.54037 |  18.77 | 0.13 |   V     |  300 s 
2023-12-05.54391 |  18.67 | 0.13 |   R     |  300 s 
2023-12-05.65969 |  18.75 | 0.16 |   B     |  300 s 
2023-12-05.66324 |  18.58 | 0.16 |   V     |  300 s 
2023-12-05.66679 |  18.42 | 0.15 |   R     |  300 s 
2023-12-05.67035 |  >18.0 |      |   I     |  300 s