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Confirming the Optical Rebrightening of SN 2016gkg

ATel #9576; WeiKang Zheng, Isaac Shivvers, Alexei V. Filippenko (UC Berkeley), Schuyler D. Van Dyk (IPAC/Caltech), Nathan Smith (U. Arizona)
on 30 Sep 2016; 19:49 UT
Credential Certification: Weikang Zheng (zwk@umich.edu)

Subjects: Optical, Supernovae

We report on optical photometry of SN 2016gkg (ATel #9521, #9526, #9528, #9529, #9536, #9544, #9556, #9561, #9562, #9573) obtained with the 0.76-m Katzman Automatic Imaging Telescope (KAIT) at Lick Observatory. A preliminary light curve shows that the supernova has started brightening toward a second maximum since Sep. 27.4 UT (R~15.5 mag) or a few days earlier after the early fast decline, which was also detected by KAIT on Sep. 22 and 23 UT. The rebrightening is confirmed in the B, V, R, and I bands, with R~15.0 on Sep. 30.3 UT, confirming the possible optical rebrightening reported by Tartaglia et al. (ATel #9544). This is more consistent with the recent reclassification of SN 2016gkg as a Type IIb supernova reported by Van Dyk et al. (ATel #9573). SN 2016gkg could reach the second peak in the next few days; we encourage further photometric monitoring of it.