INT WFC multi-band photometric follow up of SN 2018ffs

ATel #12331; M. Mallorquin (ULL), E. M. Garcia-Zamora (ULL), A. Hernandez-Garcia (ULL & IAC), A. Alvarez-Hernandez (ULL), A. Alvarez-Saavedra (ULL), P. Carro-Portos (ULL), E. A. Diaz-Suarez (ULL), R. M. Doblas-Cabezas (ULL), M. Fernandez-Torreiro (ULL), J. E. Mendez-Delgado (ULL & IAC), D. Moral-Pombo (ULL), M. A. Nuñez-Cagigal (ULL & IAC), G. Panizo-Espinar (ULL), J. Sanchez-Sierras (ULL), D. SanJulian-Jacques (ULL), H. Villegas-Beberide (ULL), L. Monteagudo (ING), I. Perez-Fournon (ULL & IAC)
on 26 Dec 2018; 13:45 UT
Credential Certification: Ismael Perez-Fournon (ipf@iac.es)

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We report multi-band photometry of the superluminous supernova SN 2018ffs based on CCD images taken with the Wide Field Camera of the Isaac Newton Telescope (Observatorio del Roque de los Muchachos, La Palma), from 2018 Oct 12.893 UT to 12.900 UT. This supernova was discovered on 2018/08/13.491 and reported to TNS by J.Tonry et al. It was classified as SN Type SLSN-I at a redshift of z=0.142 by M. Gromadzki et al. (ATel #12042).

We report here the SN position, based on the INT images, calibrated using the Gaia DR2 catalog: RA (J2000) = 20:54:37.148, Dec (J2000) = +22:04:51.77.

The INT Wide Field Camera magnitudes of SN 2018ffs, calibrated using PanSTARRS-1 are:

g = 19.49 +/- 0.01 (2018 Oct 12.898), exposure time = 180 seconds
r = 18.88 +/- 0.01 (2018 Oct 12.901), exposure time = 180 seconds
i = 18.64 +/- 0.01 (2018 Oct 12.894), exposure time = 180 seconds

The host galaxy is detected on the INT WFC images and also in all the bands of Pan-STARRS1 DR1 (PS1 cutouts)

PS1 J2000 position of the host galaxy: RA (J2000) = 20:54:37.173, Dec (J2000) = +22:04:53.23.

PS1 Kron magnitudes of the host galaxy:

gKmag = 20.0577 +/- 0.0284
rKmag = 19.5653 +/- 0.0241
iKmag = 19.2488 +/- 0.0133
zKmag = 19.1182 +/- 0.0468
yKmag = 19.1027 +/- 0.1371

The separation of SN 2018ffs from the host galaxy is 1.5".

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 David Bishop for his wonderful compilation of extragalactic novae supernovae.

SN 2018ffs Isaac Newton Telescope WFC r-band