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FRAM-ORM pre-discovery photometry of the Galactic nova TCP J00114297+6611190

ATel #13904; Kirill Sokolovsky (MSU), Sergey Karpov, Martin Masek, Petr Janecek, Jakub Jurysek, Jan Ebr, Ronan Cunniffe, Petr Travnicek and Michael Prouza (Institute of Physics, Prague), Martin Jelinek, Jan Strobl (ASU CAS, Ondrejov), Stanislav Korotkiy (Ka-Dar Obs./Astrovert)
on 29 Jul 2020; 14:31 UT
Credential Certification: Kirill Sokolovsky (kirx@scan.sai.msu.ru)

Subjects: Optical

Referred to by ATel #: 13905, 13919, 13967, 14004

The 12.9mag (unfiltered with V zero-point) optical transient TCP J00114297+6611190 was identified on 2020-07-27.9302 UT by S. Korotkiy and spectroscopically confirmed as a Fe II type classical nova on 2020-07-29.025 with the the 2.5m Sternberg Astronomical Institute telescope (ATel #13903). The field of TCP J00114297+6611190 was regularly imaged by the FRAM-ORM wide-field camera (135mm f/2.0 telephoto lens + G4-16000 CCD) at Observatorio del Roque de los Muchachos, La Palma, Spain (Janecek et al. 2019, EPJWC 19702008), which allows us to put improved constraints on the nova outburst date. The nova is first visible at V=13.15 +/-0.22 on the image obtained on 2020-07-27.23087, while the latest non-detection was on 2020-07-26.10104 (R>12.7). We used the VaST software (Sokolovsky and Lebedev 2018, A&C, 22, 28) to derive the following aperture photometry magnitudes form the FRAM wide-field camera image cutouts (assuming V=12.201, R=11.073 for the nearby comparison star UCAC4 781-000388):

 
2459056.60000  V  >13.5 
2459056.60104  R  >12.7 
2459057.73087  V   13.15 0.22 
2459057.73156  R   12.47 0.17 
2459057.73311  V   12.66 0.18 
2459057.73381  R   12.14 0.18 
2459058.55993  V   13.11 0.12 
2459058.56097  R   11.27 0.09 
2459058.56321  R   11.61 0.10 
2459058.72076  V   13.34 0.27 
2459058.72146  R   11.99 0.11 
2459058.72301  V   13.74 0.30 
2459058.72370  R   12.11 0.11 

The narrow-field FRAM-ORM 0.25m telescope located at the same site performed a set of dedicated observations on the following night, providing us with more accurate photometry (as derived from the FRAM automatic photometry pipeline):

 
2459059.41237  B  15.11 0.08 
2459059.41385  V  13.68 0.02 
2459059.41533  R  12.39 0.01 
2459059.41688  B  15.14 0.09 
2459059.41836  V  13.65 0.02 
2459059.41984  R  12.38 0.01 
2459059.42139  B  15.16 0.09 
2459059.42287  V  13.64 0.02 
2459059.42435  R  12.39 0.01 
2459059.42589  B  15.24 0.09 
2459059.42737  V  13.68 0.02 
2459059.42885  R  12.39 0.01 
2459059.43039  B  15.17 0.07 
2459059.43187  V  13.63 0.02 
2459059.43335  R  12.37 0.01