PNV J00435642+4113559 2023 10 26.6192* 00 43 56.42 +41 13 55.9 21.2 V 813E 132S M31 9 2
2023 10 26.6192
Jingyuan Zhao and Weihao Wang, report the discovery of a possible nova. Discovery image using Johnson V filter, exposured 600-s, obtained by 0.5-m f/6.8 Lulin-ASIAA Telescope for Transients and Education (LATTE) at Lulin Observatory (D35) around 2023 Oct. 26.61924 UT, mag = 21.2 V. The transient is also visible on another Johnson R filter image taken by LATTE in the same night (2023 Oct. 26.62627, exposured 600-s, mag = 20.4 R), and it is significantly brighter in the image taken by LATTE on October 30th (2023 Oct. 30.60508, exposured 600-s, mag = 20.1 V; 2023 Oct. 30.61675, exposured 600-s, mag = 19.2 R). The transient is faintly visible on images taken by LATTE a few days earlier. No object can be seen at this location on the PanSTARRS DR1 image. We also reported the transient to TNS, and it was named AT 2023wck (see https://www.wis-tns.org/object/2023wck ). Images can be found at https://www.wis-tns.org/system/files/uploaded/general/tns_2023wck_atrep_192127.jpg
2023 11 06.23624
Based on the ALeRCE ZTF photometry (see https://alerce.online/object/ZTF23abnpynv ) show symmetry demonstrated, we suggest that AT 2023wck may be a gravitational microlensing event in M31. Considering that the candidate has become very faint, deep photometry and spectroscopic observations are encouraged.