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GROND followup of DLT16am/AT2016ija

ATel #9789; Ting-Wan Chen, Patricia Schady, Thomas Kruehler (MPE)
on 24 Nov 2016; 14:25 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Ting-Wan Chen (jchen@mpe.mpg.de)

Subjects: Infra-Red, Optical, Supernovae, Transient

On behalf of the GROND SN team we observed the field of DLT16am/AT2016ija (Tartaglia et al., ATel #9782) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2m MPG telescope at the ESO La Silla Observatory (Chile).

Observations started at 03:58 UT on 2016-11-22, 2 days after the explosion constraint time reported by Smith et al. (ATel #9784). We derive the following preliminary magnitudes and upper limits (all in the AB system):

g' > 19.4 mag (galaxy background),
r' = 18.3 +- 0.1 mag,
i' = 17.7 +- 0.1 mag,
z' = 17.2 +- 0.1 mag,
J = 16.0 +- 0.1 mag,
H = 15.8 +- 0.1 mag, and
K = 15.9 +- 0.1 mag.

The very red spectral energy distribution may due to substantial extinction in the host galaxy.

We have deep imaging taken on 2016 11 13.25 (3-sigma detection limit of r' > 23.2 mag; J > 21.03 mag) without SN detection but in which we observed several dense H II regions nearby (~ 2") the SN explosion site.

Given magnitudes are calibrated against GROND zeropoint as well as 2MASS field stars and are not corrected for the expected Galactic foreground extinction corresponding to a reddening of E_(B-V) = 0.01 mag in the direction of the burst (Schlafly & Finkbeiner 2011).