AstroNote 2023-264

AT 2023txu (ATLAS23tma) was reported to TNS by ATLAS as a SN candidate in galaxy NGC 6676 (z = 0.022676, NED) at magnitude m_o = 18.96 +/- 0.19 on MJD = 60220.29 (2023-10-03.29). The transient was also detected by Gaia at G-Gaia = 18.95 +/- 0.2 on MJD = 60219.82 (2023-10-02.82). Here, we report follow-up photometry of AT 2023txu in the SDSS g' filter with the CAMELOT2 camera of the IAC80 telescope (Tenerife, Canary Islands, Spain). We measure a magnitude g' = 17.44 +/- 0.08 on MJD = 60224.97 (2023-10-07.97 ) calibrated using the Gaia DR3 synthetic photometry catalog generated from the Gaia BP/RP mean spectra (Gaia Collaboration, 2022), uncorrected for interstellar extinction.  This bright transient has not been classified yet. We encourage follow-up observations, particularly the spectroscopic classification.

This work is based on observations made in the Observatorios de Canarias del IAC with the IAC80 telescope operated on the island of Tenerife by the Instituto de Astrofísica de Canarias in the Observatorio del Teide. The IAC80 observations are part of a course in Astrophysical Techniques of the Master in Astrophysics of the Astrophysics Department of the University of La Laguna and Instituto de Astrofísica de Canarias (Tenerife, Spain). We thank David Bishop for his compilation of supernovae.