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INT WFC pre-discovery detection of the nova M31N 2017-11a (AT2017hvi, PTSS-17zap, TCP J00425419+4130425)

ATel #11108; E. A. Mantero-Casta\~neda, M. Hernandez-Sanchez, C. Arce-Tord, A. Esteban-Gutierrez, E. Garcia-Broock, M. Garcia-Rivas, L. Gonzalez-Cuesta, L. Hermosa-Mu\~noz, A. Jimenez-Gallardo, E. Lopez-Navas, J. Otero-Santos, M. G. Prendin, and M. Rodriguez-Sanchez (Universidad de La Laguna, Tenerife, Spain), and I. Perez-Fournon (Universidad de La Laguna and Instituto de Astrofisica de Canarias, Tenerife, Spain)
on 29 Dec 2017; 17:46 UT
Credential Certification: Ismael Perez-Fournon (ipf@iac.es)

Subjects: Optical, Nova

We report the pre-discovery detection of the nova M31N 2017-11a (AT2017hvi, PTSS-17zap, TCP J00425419+4130425) with the Isaac Newton Telescope* Wide Field Camera on the night of 29 October 2017, 4.845 days before the discovery observations on 2017/11/04.695 by the PMO-Tsinghua Supernova Survey (PTSS).

Spectroscopic observations by S.C. Williams and M.J. Darnley with the Liverpool telescope (ATEL #10990) and by S. Fabrika et al. with the Russian BTA telescope (ATEL #10998) show that this nova belongs to the FeII spectroscopic class. Z. Xu et al. (ATEL # 11095) have reported photometric follow-up observations at the Xingming Observatory from 2017 11 05.52715 to 2017 12 24.56936 that show an optical re-brightening from magnitude 19.0 on 2017-12-15 UT to ~ 18.4 around 2017-12-23.7 UT. The estimated outburst peaked at an unfiltered magnitude of 17.6 around 2017-11-05.5 UT.

The following AB magnitudes, calibrated using the PanSTARRS-1 DR1 catalog, were obtained with the INT WFC in photometric and good seeing (1" FWHM) conditions:

r = 19.31 +/- 0.06, 2017 October 29.850
i = 19.35 +/- 0.09, 2017 October 29.963
g = 19.63 +/- 0.05, 2017 October 30.059

The INT WFC J2000 coordinates of the nova in the GAIA DR1 reference system are RA = 00 42 54.22, Dec = +41 30 42.3

* Based on observations made with the Isaac Newton Telescope operated on the island of La Palma by the Isaac Newton Group of Telescopes in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias.

We thank the ING staff for their support of the observations at the Isaac Newton Telescope.

INT WFC finding chart in the Sloan g band (180 seconds)