GROND follow-up of superluminous supernova OGLE15qz

ATel #8314; Z. Kostrzewa-Rutkowska, L. Wyrzykowski, S. Kozlowski, A. Udalski (Warsaw University Astronomical Observatory), J. Greiner, F. Knust (MPE Garching)
on 21 Nov 2015; 08:49 UT
Credential Certification: Lukasz Wyrzykowski (wyrzykow@astrouw.edu.pl)

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OGLE15qz was discovered on 2015 November 13 by the OGLE-IV Transient Detection System (Wyrzykowski et al., 2014, AcA, 64,197; Kozlowski et al. 2013; ogle.astrouw.edu.pl/ogle4/transients/). The target was classified as SLSN Ic at z~0.63 with the absolute magnitude of -22.6 by PESSTO (ATel #8296).

We observed the field of OGLE15qz simultaneously in grizJHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2 m MPG telescope at ESO La Silla Observatory (Chile).

Observations started at November 16, 2015, 04:14 UTC. They were performed at an average seeing of 1.3" and at an average airmass of 1.3.

Based on 8.3 min of total exposure in griz and 10.7 min in JHK, we derive preliminary magnitudes of:
g' = 20.27 +- 0.02
r' = 20.22 +- 0.02
i' = 20.49 +- 0.04
z' = 20.69 +- 0.07
J = 20.92 +- 0.46
H > 19.9
K > 18.1

These measurements are in the AB system and calibrated against GROND zero-points in griz and 2MASS field stars in JHK. They are corrected for the expected Galactic foreground extinction in the direction of the supernova (Schlegel, Finkbeiner & Davis 1998).

The Black Body temperature estimate from GROND grizJ data from around maximum indicated about 15000 K which stands in agreement with previously detected SLSNe.