Optical Bumps in Cosmological GRBs as Supernovae

Details Optical Bumps in Cosmological GRBs as Supernovae Optical Bumps in Cosmological GRBs as Supernovae

2004-03-23

arxiv.org/abs/astro-ph/0403549v1

Astronomy and Astrophysics

Astrophysics

5 pages, 2 figures. To be published in Proc. IAU Colloquium #192 ``Supernovae (10 years of SN1993J),'' held 22-26 April 2003,

Scientific paper

From both photometric and broadband spectral monitoring of gamma-ray burst (GRB) lightcurve ``bumps,'' particularly in GRB 011121, a strong case grew for a supernova (SN) origin. The GRB-SN connection was finally solidified beyond a reasonable doubt with the discovery that the bump in GRB 030329 was spectroscopically similar to a bright Type Ic SN. In light of this result, I redress the previous SN bump claims and conclude that 1) the distribution of GRB-SN bump peak magnitudes is consistent with the local Type Ibc SNe peak distribution and suggest that 2) the late-time bumps in all long-duration GRBs are likely supernovae.

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