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SN 2006aj and the nature of low-luminosity gamma-ray bursts

B. E. Cobb·C. D. Bailyn·P. G. van Dokkum·P. Natarajan
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Abstract

We present SMARTS consortium optical/IR light curves of SN 2006aj associated with GRB 060218. We find that this event is broadly similar to two previously observed events SN 1998bw/GRB 980425 and SN 2003lw/GRB 031203. In particular, all of these events are greatly under-luminous in gamma-rays compared to typical long-duration GRBs. We find that the observation by Swift of even one such event implies a large enough true event rate to create difficulties in interpreting these events as typical GRBs observed off-axis. Thus these events appear to be intrinsically different from and much more common than high-luminosity GRBs, which have been observed in large numbers out to a redshift of at least 6.3. The existence of a range of intrinsic energies of GRBs may present challenges to using GRBs as standard candles.

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B. E. Cobb, C. D. Bailyn, P. G. van Dokkum, P. Natarajan. 2006-05-30. SN 2006aj and the nature of low-luminosity gamma-ray bursts. https://doi.org/10.1086/506271

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