Optical and near-infrared photometry of SN 2016adj (Cen A) with GROND

ATel #8665; Thomas Kruehler, Jochen Greiner (both MPE Garching)
on 10 Feb 2016; 09:14 UT
Credential Certification: J. Greiner (jcg@mpe.mpg.de)

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We observed the SN 2016adj in Cen A (Marples et al. 2016, ATEL #8651) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2 m MPG telescope at ESO La Silla Observatory (Chile). We obtained 80 sec of total exposure in g'r'i'z and 48 sec in JHK at a midtime of 09:10 UT on 2016-02-09, at a seeing of 1.2 arcsec and at an airmass of 1.03.

We estimate the following preliminary magnitudes (all in the AB system):

g' = 16.6 +- 0.1 mag

r' = 14.7 +- 0.1 mag

i' = 13.5 +- 0.1 mag

z' = 12.7 +- 0.1 mag

J = 11.6 +- 0.1 mag

H = 11.4 +- 0.1 mag

K = 11.3 +- 0.1 mag

Given magnitudes are calibrated against GROND zeropoints as well as 2MASS field stars and are not corrected for the expected Galactic foreground extinction corresponding to a reddening of E_(B-V)=0.1 mag in the direction of the burst (Schlafly & Finkbeiner 2011).

The very red spectral energy distribution is consistent with the substantial extinction noticed already earlier (Kiyota et al. 2016, ATEL #8654).