H-alpha observations of the nova AT2023uri in M31

ATel #16291; A. Valcheva (University of Sofia, Bulgaria), M. Minev, I., A. Kostov (IA and NAO, BAS, Bulgaria), E. Ovcharov, P. Nedialkov (University of Sofia, Bulgaria)
on 15 Oct 2023; 05:28 UT
Credential Certification: Antoniya Valcheva (valcheva@phys.uni-sofia.bg)

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We report H-alpha observations of the nova in M31 AT 2023uri (= PSP23K) (= PNV J00430061+4119400) (= M31N 2023-10d) discovered independently by Xingming Observatory Sky Survey (XOSS) and Hornoch et al. (ATel #16285).

Our observations in H-alpha (FWHM of 3 nm), performed with the FoReRo2 focal reducer at 2m RCC telescope at NAO Rozhen, Bulgaria, show strong increasing H-alpha emission in 3x300 sec co-added frames. Broadband observations are also available and show that the transient is slowly fading in R-band. Available magnitudes are summarized below:

H-alpha
2023 Oct 12.8779 UT, 15.68±0.02 (3x300 sec)
2023 Oct 14.1081 UT, 15.08±0.01 (3x300 sec)
R
2023 Oct 12.8630 UT, 15.97±0.01 (5x120 sec)
2023 Oct 14.0945 UT, 16.63±0.01 (3x120 sec)

The detection of the strong H-alpha excess of AT 2023uri confirms its classification as a nova in M31. Follow-up observations are encouraged in order to determine the nova's spectroscopic and speed class.

The research infrastructure this research was done with is funded by the Ministry of Education and Science of Bulgaria (support for the Bulgarian National Roadmap for Research Infrastructure).