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We present optical and near-infrared (NIR) photometry for three gamma-rayburst supernovae (GRB-SNe): GRB 120729A, GRB 130215A / SN 2013ez and GRB130831A / SN 2013fu. In the case of GRB 130215A / SN 2013ez, we also presentoptical spectroscopy at t-t0=16.1 d, which covers rest-frame 3000-6250Angstroms. Based on Fe II (5169) and Si (II) (6355), our spectrum indicates anunusually low expansion velocity of 4000-6350 km/s, the lowest ever measuredfor a GRB-SN. Additionally, we determined the brightness and shape of eachaccompanying SN relative to a template supernova (SN 1998bw), which were usedto estimate the amount of nickel produced via nucleosynthesis during eachexplosion. We find that our derived nickel masses are typical of other GRB-SNe,and greater than those of SNe Ibc that are not associated with GRBs. For GRB130831A / SN 2013fu, we use our well-sampled R-band light curve (LC) toestimate the amount of ejecta mass and the kinetic energy of the SN, findingthat these too are similar to other GRB-SNe. For GRB 130215A, we take advantageof contemporaneous optical/NIR observations to construct an optical/NIRbolometric LC of the afterglow. We fit the bolometric LC with the millisecondmagnetar model of Zhang & Meszaros (2001), which considers dipole radiation asa source of energy injection to the forward shock powering the optical/NIRafterglow. Using this model we derive an initial spin period of P=12 ms and amagnetic field of B=1.1 x 10^15 G, which are commensurate with those found forproposed magnetar central engines of other long-duration GRBs.

A Trio of GRB-SNe: GRB 120729A, GRB 130215A / SN 2013ez and GRB 130831A / SN 2013fu