Properties of the host galaxy of the possible superluminous supernova MASTER OT J000256.70+323252.3 (= ZTF19aaaajhn)

ATel #12356; I. Perez-Fournon (IAC and ULL), 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), E. M. Garcia-Zamora (ULL), A. Hernandez-Garcia (ULL & IAC), M. Mallorquin (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), and H. Villegas-Beberide (ULL)
on 4 Jan 2019; 13:32 UT
Credential Certification: Ismael Perez-Fournon (ipf@iac.es)

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We provide information from public imaging surveys (SDSS DR15 and Pan-STARRS1 DR1) on the likely host galaxy of the possible superluminous supernova MASTER OT J000256.70+323252.3 (= ZTF19aaaajhn) discovered on 2019-01-02.64550 UT by T. Pogrosheva et al. (ATel #12352) using MASTER-Kislovodsk. The MASTER OT unfiltered magnitude is 17.4.

Using the Lasair and MARS services on transients we find that MASTER OT J000256.70+323252.3 has also been detected by the ZTF survey:
objectId = ZTF19aaaajhn, g-band magpsf = 17.843 +/- 0.046, 2019-01-03 03:39:38 UT.

Lasair info on ZTF19aaaajhn: https://lasair.roe.ac.uk/object/ZTF19aaaajhn/

MARS info on ZTF19aaaajhn: https://mars.lco.global/?sort_value=jd&sort_order=desc&objectId=ZTF19aaaajhn

A faint galaxy, likely the host galaxy of MASTER OT J000256.70+323252.3 is detected in the SDSS DR15 and Pan-STARRS1 (PS1) DR1 imaging (see our SDSS g-band finding chart).

SDSS DR15 ID, magnitudes and photometric redshift of the host galaxy:

SDSS J000256.70+323251.9
u = 22.40 +/- 0.37, g = 22.23 +/- 0.09, r = 22.29 +/- 0.19, i = 21.72 +/- 0.17, and z = 21.50 +/- 0.57.
photoZ (KD-tree method) = 0.926 +/- 0.1463

Pan-STARRS1 DR1 host galaxy ID and magnitudes:

Pan-STARRS1 DR1 cutouts (30"x30")
objID = 147050007362697983
gmag (PS1 DR1) = 22.2314 +/- 0.0089
rmag (PS1 DR1)= 22.3918 +/- 0.1785
(Mean PSF AB magnitudes, not detected in i, z and y)

The offsets from the MASTER optical transient to the SDSS and PS1 positions of the host galaxy are 0.4" and 0.1", respectively.

We encourage follow-up photometric and spectroscopic observations of MASTER OT J000256.70+323252.3.

We thank David Bishop for his wonderful compilation of extragalactic novae and supernovae and the Lasair and MARS services on public alerts.

Lasair: https://lasair.roe.ac.uk

MARS: https://mars.lco.global

MASTER OT J000256.70+323252.3 finding chart (SDSS DR15 g-band)