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After the discovery of the first connection between GRBs and SNe almost twodecades ago, tens of SN-like rebrightenings have been discovered and aboutseven solid associations have been spectroscopically confirmed to date. UsingGROND optical/NIR data and Swift X-ray/UV data, we estimate the intrinsicextinction, luminosity, and evolution of three SN rebrightenings in GRBafterglow light curves at z~0.5. The SNe 2008hw, 2009nz, and 2010ma exhibit0.80, 1.15, and 1.78 times the optical (r band) luminosity of SN 1998bw,respectively. While SN 2009nz evolves similarly to SN 1998bw, SNe 2008hw and2010ma show earlier peak times. The quasi-bolometric light curves werecorrected for the contribution of the NIR bands using data available in theliterature and blackbody fits. The large luminosity of SN 2010ma (1.4x10^43erg/s) is confirmed, while SNe 2008hw and 2009nz reached a peak luminositycloser to SN 1998bw. Physical parameters of the SN explosions, such assynthesised nickel mass, ejecta mass, and kinetic energy, are estimated usingArnett's analytic approach, which resulted in nickel masses of around 0.4-0.5Msun. By means of the a very comprehensive data set, we found that theluminosity and the nickel mass of SNe 2008hw, 2009nz, and 2010ma resemblesthose of other known GRB-associated SNe. This findings strengthens previousclaims of GRB-SNe being brighter than type-Ic SNe unaccompanied by GRBs.

Multiwavelength analysis of three SNe associated with GRBs observed by GROND