Central Bureau for Astronomical Telegrams

CBAT "Transient Object Followup Reports"

PNV J00420621+4052107

PNV J00420621+4052107   2025 09 12.0040*  00 42 06.21 +40 52 10.7  20.6 C             M31       7 1

2025 09 12.0040

Róbert Fidrich and Tamás Tordai (HAA/VSS) report the discovery of a 20.3 magnitudes astronomical transient. Discovered using 4x120s co-added images made with a 0.43 m Dall-Kirkham telescope at Alnitak Remote Observatory, Sierra del Segura, SpaiN, with Luminance filter at 2025 September 14.1080UT. The transient was already visible on images made at 12.0040UT, however nothing was visible on stacked reference images made on 11 nights in June and July with 21.0 magnitudes limit. Discovery image: https://vendegcsillagkereso.blogspot.com/2025/09/vend67-faint-transient-in-m31.html